Page 1 NOTE: The following applies to CE‑marked products only. Declaration of Conformity—Mercury MerCruiser This sterndrive or inboard engine when installed in accordance to Mercury MerCruiser’s instructions complies with the requirements of the following directives by meeting the associated standards, as amended:...
Page 2 This declaration of conformity is issued under the sole responsibility of the manufacturer. I declare on behalf of the engine manufacturer that the engine(s) mentioned above complies (comply) with all applicable essential requirements in the way specified. Name / function: Signature and title: Mark Schwabero, President, Mercury Marine Date and place of issue: January 28, 2011 Stillwater, Oklahoma, USA...
Page 3: Read This Manual Thoroughly
At Mercury Marine every engine is operated and tested before it is boxed for shipment to make sure that the product is ready for use. In addition, certain Mercury Marine products are tested in a controlled and monitored environment, for up to 10 hours of engine run time, in order to verify and make a record of compliance with applicable standards and regulations.
Page 4 Notice Throughout this publication, and on your power package, dangers, warnings, cautions, and notices, accompanied by the International Hazard Symbol , may be used to alert the installer/user to special instructions concerning a particular service or operation that may be hazardous if performed incorrectly or carelessly. Observe them carefully. These safety alerts alone cannot eliminate the hazards they warn of.
Page 5: Table Of Contents
Transfer of Warranty..............2 Owner Responsibility............13 Mercury Installation Quality Certification Program..... 3 California Emissions Limited Warranty—350/377 MAG ECT Mercury Product Protection Plan: United States and Canada... 4 and SeaCore 350/377 MAG ECT........13 Mercury MerCruiser Limited Warranty (Gasoline‑Fueled What Is Covered............13 Products Only) ................4...
Page 6 Gasoline Containing Alcohol........64 ECT................. 69 Engine Oil................64 Engine—350/377 MAG and SeaCore 350/377 MAG..69 350 MAG ECT, SeaCore 350 MAG ECT......65 Alpha Sterndrive.............. 70 377 MAG ECT, SeaCore 377 MAG ECT......66 Bravo Sterndrives............70 350/377 MAG and SeaCore 350/377 MAG—Specifications.. 66 Power‑Assisted Steering and Power Trim Fluids....
Page 7 Section 6 - Storage Cold Weather or Extended Storage........124 Draining the Seawater System........125 Preparing Power Package for Storage......124 Engine and Fuel System Preparation......124 Draining the Seawater System—350/377 MAG ECT and SeaCore 350 MAG ECT............125 90-8M0050539 MAY 2011 Page iii...
Page 8 Sterndrive Unit Does Not Move)........153 Section 8 - Customer Assistance Information Owner Service Assistance............156 Resolving a Problem............156 Local Repair Service............156 Contact Information for Mercury Marine Customer Service Service Away From Home..........156 ..................157 Stolen Power Package........... 156 Ordering Literature............... 157 Attention Required After Submersion......156 United States and Canada..........157...
Page 9: Section 1 - Warranty
Transfer of Warranty............... 2 Owner Responsibility ..........13 Mercury Installation Quality Certification Program....3 California Emissions Limited Warranty—350/377 MAG Mercury Product Protection Plan: United States and Canada ECT and SeaCore 350/377 MAG ECT......13 ....................4 What Is Covered ............ 13 Mercury MerCruiser Limited Warranty (Gasoline‑Fueled...
Page 10: Warranty Registration: United States And Canada
Federal Boat Safety Act is required. You may change your address at any time, including at time of warranty claim, by calling Mercury MerCruiser or sending a letter or fax to Mercury MerCruiser’s warranty registration department with your name, old address, new address, and engine serial number.
Page 11: Mercury Installation Quality Certification Program
Mississauga, Canada, L5N 7W6 Fax 1-800-663-8334 Upon processing the transfer of warranty, Mercury Marine will send registration verification to the new owner of the product by mail. There is no charge for this service. For products purchased outside the United States and Canada, contact the distributor in your country, or the distributor closest to you.
Page 12: Mercury Product Protection Plan: United States And Canada
Mercury MerCruiser Limited Warranty (Gasoline‑Fueled Products Only) Mercury MerCruiser Limited Warranty (Gasoline-Fueled Products Only) What is Covered Mercury Marine warrants its new products to be free of defects in material and workmanship during the period described following. Duration of Coverage Warranty Period for Recreational Use The warranty period begins on the date the product is first sold to a recreational‑use retail purchaser or the date on which the...
Page 13 Warranty claims shall be made by delivering the product for inspection to a Mercury Marine dealer authorized to service the product. If the purchaser cannot deliver the product to such a dealer, written notice must be given to Mercury Marine.
Page 14: 3-Year Limited Warranty Against Corrosion
Improper installation (proper installation specifications and techniques are set forth in the installation instructions for the product) • Improper service • Use of an accessory or part that was not manufactured or sold by Mercury Marine and that damages the Mercury product • Jet pump impellers and liners •...
Page 15: 4-Year Limited Corrosion Warranty: Seacore Sterndrive Models With Gas Engines
Warranty coverage is available only to retail customers that purchase from a dealer authorized by Mercury Marine to distribute the product in the country in which the sale occurred, and then only after the Mercury Marine specified pre‑delivery inspection process is completed and documented. Warranty coverage becomes available upon proper registration of the product by the authorized dealer.
Page 16 Warranty claims shall be made by delivering the product for inspection to a Mercury Marine dealer authorized to service the product. If the purchaser cannot deliver the product to such a dealer, written notice must be given to Mercury Marine. Mercury Marine will then arrange for the inspection and any covered repair.
Page 17: Global Application Warranty Charts-350/377 Mag Ect And
2 years 2 years 2 years Brazil 3 years 4 years 4 years Europe, Middle East, Africa SeaCore 350 MAG EC 3 years 3 years 4 years Australia, New Zealand SeaCore 377 MAG EC 1 year 1 year 1 year...
Page 18: Warranty For Government Applications
2 years 2 years Brazil 350 MAG EC Europe, Middle East, Africa 377 MAG EC Australia, New Zealand SeaCore 350 MAG EC 1 year or 500 1 year or 500 1 year or 500 Japan SeaCore 377 MAG EC hours...
Page 19: Warranty For Commercial Applications
Engines designated as exempt from either Federal EPA or California emission control regulations are not covered by a separate emission control component warranty. The product's Mercury MerCruiser manufacturer's warranty is not affected by the engine's designation under Federal EPA or California emission control regulations.
Page 20: Emission Control Information Label
A tamper‑resistant emission control information (ECI) label is affixed to the engine in a visible location at the time of manufacture by Mercury MerCruiser. Please note that the low emissions certification will not affect the fit, function, or performance of the engine.
Page 21: Owner Responsibility
California Emissions Limited Warranty—350/377 MAG ECT and SeaCore 350/377 MAG NOTE: Mercury Marine does not establish model years for the Mercury MerCruiser product line. In order to comply with CARB warranty regulations, and for that limited purpose only, model year shall have the same meaning as calendar year. As an example, 2003 model year products refers to products manufactured during calendar year 2003.
Page 22: Duration Of Coverage
Warranty claims shall be made by delivering the product for inspection to a Mercury dealer authorized to service the product. If purchaser cannot deliver the product to such a dealer, please notify Mercury Marine and Mercury will then arrange for the inspection and any covered repair.
Page 23: Disclaimers And Limitations
Mercury Marine recommends that you retain all receipts covering maintenance on your inboard or sterndrive engine, but Mercury Marine cannot deny warranty solely for the lack of receipts or your failure to ensure the performance of all scheduled maintenance.
Page 24: Emission Certification Star Label
Better Fuel Economy ‑ burns up to 30‑40 percent less gas and oil than conventional carbureted two‑stroke engines, saving money and resources. Longer Emission Warranty ‑ Protects consumer for worry free operation. Beginning January 1, 2003, one Three‑Star or Four‑Star label will be included with each factory‑certified Mercury MerCruiser engine. Page 16...
Page 25 Section 1 - Warranty All Mercury MerCruiser engines (500 hp and below) will have a Three‑Star Ultra Low Emission rating or Four‑Star Super Ultra Low Emission rating. The Star label identifies that these engines meet the California Air Resources Board's Sterndrive and Inboard marine engine 2007 and later exhaust emission standards.
Page 26: Hang Tag
Section 1 - Warranty One Star - Low emission The one‑star label identifies personal watercraft, outboard, sterndrive and inboard engines that meet the Air Resources Board's Personal Watercraft and Outboard marine engine 2001 exhaust emission standards. Engines meeting these standards have 75% lower emissions than conventional carbureted two‑stroke engines.
Page 27 Section 1 - Warranty If in California, the dealer must place the hang tag in a visible location in the boat prior to displaying the boat. 43291 Hang tag front side Hang tag back side 90-8M0050539 MAY 2011 Page 19...
Page 28 Section 1 - Warranty Notes: Page 20 90-8M0050539 MAY 2011...
Page 29: Section 2 - Getting To Know Your Power Package
Section 2 - Getting to Know Your Power Package Section 2 - Getting to Know Your Power Package Table of Contents Additional Operation Instructions for Axius Systems ... 22 Dual Console Control with CAN Trackpad Features and Identification................. 22 Operation................34 Engine Serial Number Decal MPI........
Page 30: Additional Operation Instructions For Axius Systems
Section 2 - Getting to Know Your Power Package Additional Operation Instructions for Axius Systems If your boat has DTS engines equipped with an Axius system, refer also to the Axius Operation Manual included with the boat. Identification The serial numbers are the manufacture's keys to numerous engineering details which apply to your MerCruiser power package. When contacting MerCruiser about service, always specify model and serial numbers.
Page 31: Alpha Transom Serial Number
Section 2 - Getting to Know Your Power Package Alpha Transom Serial Number The transom serial number is located on the top of the transom assembly. 25619 Alpha transom assembly serial number Bravo Sterndrive Serial Number and Identification The Bravo sterndrive serial number, gear ratio, model number, and bar code are embedded in the ground plate on the port side of the sterndrive.
Page 32: Bravo Transom Serial Number
Section 2 - Getting to Know Your Power Package Bravo Transom Serial Number The Bravo transom serial number is stamped in the U‑bolt plate of the Bravo transom assembly. Bravo transom assembly U-bolt plate Transom assembly serial Number 25904 The serial number is also stamped on the gimbal housing. This is used as a permanent reference for authorized MerCruiser Dealers.
Page 33: Instrumentation-350/377 Mag And Seacore 350/377 Mag
Instrumentation—350/377 MAG and SeaCore 350/377 MAG Digital Gauges A Mercury SmartCraft System instrument package can be purchased for this product. A few of the functions the instrument package will display are engine RPM, coolant temperature, oil pressure, battery voltage, fuel consumption and engine operating hours.
Page 34: Analog Gauges
Section 2 - Getting to Know Your Power Package Analog Gauges The following is a brief explanation of the instrumentation typically found on some boats. As the owner or operator, you should be familiar with all instruments and their functions. Because of the large variety of instrumentation and manufacturers, you should have your boat dealer explain the particular gauges and normal readings for your boat.
Page 35: Digital Gauges
Digital Gauges A Mercury SmartCraft System instrument package can be purchased for this product. A few of the functions the instrument package will display are engine RPM, coolant temperature, oil pressure (requires a SmartCraft oil pressure sender kit), battery voltage, fuel consumption, and engine operating hours.
Page 36: Analog Gauges
Remote Controls (Non‑DTS Models) Remote Controls Your boat may be equipped with a Mercury Precision Parts or Quicksilver remote controls. All controls may not have all features shown. Consult your dealer for a description and/or demonstration of your remote control.
Page 37: Panel Mount Features
Section 2 - Getting to Know Your Power Package Panel Mount Features Neutral lock button Throttle only button Lanyard stop switch Control handle tension adjustment screw Control handle Trim/tilt button mc77019-1 Neutral Lock Button - Prevents accidental shift and throttle engagement. Neutral lock button must be pushed into move the control handle out of neutral.
Page 38: Remote Controls (Dts Models)
IMPORTANT: Your boat must be equipped with a Mercury Marine electronic remote control. Start in gear protection is provided by this control system and prevents the engine from starting when the control is actuated in forward or reverse. Refer to the Mercury Precision Parts/Quicksilver Accessories Guide.
Page 39: Console Mount Features - Single Engine
Section 2 - Getting to Know Your Power Package Console Mount Features ‑ Single Engine Control handle Trim/tilt switch Active light Neutral light Select key Arrow trackpad Throttle only/station select key Detent tension adjustment Control handle friction adjustment screw 3410 Control Handle - Operation of the shift and throttle are controlled by the movement of the control handle.
Page 40: Console Mount Features- Dual Engine
Section 2 - Getting to Know Your Power Package Throttle Only/Station Select Key - Allows engine throttle advancement without shifting the engine. The throttle only/station select button also allows the boat operator to select which remote control is in control of the engine operation when operating with multiple helms.
Page 41: Dual Helm Station Transfer
Section 2 - Getting to Know Your Power Package Auto Synchronizing will stay engaged up to 95% throttle opening. The Sync light will turn on when the engines are synchronized. SYNC ACTIVE THROTTLE ONLY STAT ION SELECT 3434 To disengage, move one or both control handles until they are more than 5° apart, reduce engine speed below 900 RPM, or increase engine speed beyond 95%.
Page 42: Zero Effort Features
Section 2 - Getting to Know Your Power Package Zero Effort Features Shift ever Throttle lever Trim/tilt switch 5656 Shift Lever - Shift functions are controlled by the movement of the shift lever. Shift into reverse by moving the shift lever to its aft position.
Page 43: Synchronizing Engines
Section 2 - Getting to Know Your Power Package Troll button ‑ Pressing the "TROLL" button activates troll control. The troll control feature allows the boat operator to set the engine speed for slow speed cruising or maneuvering. To activate, move the control handles into forward detent and press the button.
Page 44: Helm Transfer
Section 2 - Getting to Know Your Power Package Press the "SYNC" button on the CAN trackpad to turn auto synchronization on or off. When the sync LED is yellow, the "SYNC" button has been pressed, but the conditions are not right for auto synchronization to engage. When the sync LED turns red, engine synchronization has been engaged.
Page 45: Zero Effort Features
Section 2 - Getting to Know Your Power Package Zero Effort Features Shift ever Throttle lever Trim/tilt switch 5656 Shift Lever - Shift functions are controlled by the movement of the shift lever. Shift into reverse by moving the shift lever to its aft position.
Page 46: Single Engine Trim/Trailer
Section 2 - Getting to Know Your Power Package • Cause engine overheating if trimmed up/out to a point where any cooling water intake holes are above the water line mc78529 Trimming sterndrive unit down/in can: • Help the boat accelerate and plane off quicker •...
Page 47 Section 2 - Getting to Know Your Power Package Push the red test button. A yellow lever appears if the circuit breaker is functioning properly. Reset the breaker by pushing the yellow lever back into the housing. Yellow lever style circuit breaker Yellow lever Red test button 22529...
Page 48 Section 2 - Getting to Know Your Power Package Two 10 amp fuses protect the O (oxygen) sensors. These are located at the rear of the engine, near the 14‑pin connector. 33177 A 15 amp accessory fuse protects the accessory circuits. This fuse is located on the rear of the engine. Cover 15 amp fuse Accessory harness...
Page 49 Section 2 - Getting to Know Your Power Package The power trim system is protected from overload by both a 110 amp fuse and a 20 amp spade fuse on the power trim pump. The trim pump may also have an in‑line circuit protection device in the power trim positive lead near the battery switch or battery connection.
Page 50: Electrical System Overload Protection-350/377 Mag And
Section 2 - Getting to Know Your Power Package The Quicksilver MerCathode System has a 20 amp in‑line fuse in the wire which connects to the positive (+) terminal on controller. If the fuse is open, the system will not operate and will not protect against corrosion. mc79977 Electrical System Overload Protection—350/377 MAG and SeaCore 350/377 If an electrical overload occurs, a fuse will blow or the circuit breaker will trip open.
Page 51 Section 2 - Getting to Know Your Power Package Four fuses are located on the port side of the engine. These fuses protect the main power, fuel pump, ignition, and accessory circuits. mc77602-1 A 20 amp fuse may be located in the ignition switch "I" terminal lead to protect the electrical system. Check for blown fuse if the ignition key is turned to the "START"...
Page 52: Visual And Audio Warning Systems-350/377 Mag Ect And Seacore 350/377 Mag Ect
IMPORTANT: The audio warning system alerts the operator that a problem has occurred. It does not protect the engine from damage. The Mercury MerCruiser power package may be equipped with an audio warning system. Most faults cause the warning horn circuit to activate. How the warning horn activates depends on the severity of the problem.
Page 53: Caution
Severe IMPORTANT: Operators are advised to contact an authorized Mercury MerCruiser dealer if a severe fault is activated. If a severe state is detected, the audio warning system sounds for six seconds, turns off for six seconds, and sounds for six more seconds.
Page 54: Audio Warning System-350/377 Mag And Seacore350/377 Mag
IMPORTANT: The audio warning system alerts the operator that a problem has occurred. It does not protect the engine from damage. The Mercury MerCruiser power package may be equipped with an audio warning system. Most faults cause the warning horn circuit to activate. How the warning horn activates depends on the severity of the problem.
Page 55 Section 2 - Getting to Know Your Power Package • Engine overspeed • Exhaust Manifold Temperature (8.1 and 496 models only) Also the Engine Guardian Strategy will reduce engine power to 90 percent of maximum if any sensor on the power package fails. For example, if the water inlet becomes partially blocked, Engine Guardian Strategy will reduce the available power level of the engine to help prevent damage from decreased water flow to the engine.
Page 56 Section 2 - Getting to Know Your Power Package Notes: Page 48 90-8M0050539 MAY 2011...
Page 57 Section 3 - On the Water Section 3 - On the Water Table of Contents Additional Operation Instructions for Axius Systems ... 50 Freezing Temperature Operation........56 Safe Boating Suggestions............ 50 Drain Plug and Bilge Pump..........57 Carbon Monoxide Exposure..........51 Protecting People in the Water..........
Page 58: Additional Operation Instructions For Axius Systems
Most boats are rated and certified for maximum load (weight) capacities (refer to your boat capacity plate). Know your boat's operating and loading limitations. Know if your boat will float if full of water. When in doubt, contact your authorized Mercury MerCruiser dealer or the boat manufacturer.
Page 59: Carbon Monoxide Exposure
Section 3 - On the Water Know your boating area and avoid hazardous locations. Be alert. • The operator of the boat is responsible by law to maintain a proper lookout by sight and hearing. The operator must have an unobstructed view particularly to the front.
Page 60: Poor Ventilation
Section 3 - On the Water Example of desired air flow through the boat: 43367 Poor Ventilation Under certain running or wind conditions, permanently enclosed or canvas enclosed cabins or cockpits with insufficient ventilation may draw in carbon monoxide. Install one or more carbon monoxide detectors in your boat. Although the occurrence is rare, on a very calm day, swimmers and passengers in an open area of a stationary boat that contains or is near a running engine may be exposed to a hazardous level of carbon monoxide.
Page 61: Starting And Stopping The Engine
Section 3 - On the Water Operation Chart BEFORE STARTING AFTER STARTING WHILE UNDERWAY AFTER STOPPING Check shift and throttle Turn battery switch on. Close fuel shut off valve. control operation. Operate bilge blowers. Check steering operation. Close seacock, if equipped. Flush cooling system if in Open fuel shut off valve.
Page 62: Starting The Engine After It Has Been Stopped While In Gear
IMPORTANT: If the boat is operated during periods of freezing temperature, precautions must be taken to prevent freeze damage to the power package. Damage caused by freezing is not covered by Mercury MerCruiser Limited Warranty. Drain Plug and Bilge Pump The engine compartment in your boat is a natural place for water to collect.
Page 63: Starting And Stopping The Engine
Section 3 - On the Water Operation Chart BEFORE STARTING AFTER STARTING WHILE UNDERWAY AFTER STOPPING Check shift and throttle Turn battery switch on. Close fuel shut off valve. control operation. Operate bilge blowers. Check steering operation. Close seacock, if equipped. Flush cooling system if in Open fuel shut off valve.
Page 64: Stopping The Engine
Freezing Temperature Operation IMPORTANT: If the boat is operated during periods of freezing temperature, precautions must be taken to prevent freeze damage to the power package. Damage caused by freezing is not covered by Mercury MerCruiser Limited Warranty. Page 56...
Page 65: Drain Plug And Bilge Pump
It is very important to check these items on a regular basis to ensure that the water level does not come into contact with your power package. Components on your engine will be damaged if submerged. Damage caused by submersion is not covered by the Mercury MerCruiser Limited Warranty. Protecting People in the Water While You Are Cruising It is very difficult for a person in the water to take quick action to avoid a boat heading in their direction, even at slow speeds.
Page 66: Boats With Front-Mounted, Raised Pedestal Fishing Seats
Section 3 - On the Water WARNING Sitting or standing in an area of the boat not designed for passengers at speeds above idle can cause serious injury or death. Stay back from the front end of deck boats or raised platforms and remain seated while the boat is in motion. Boats With Front‑Mounted, Raised Pedestal Fishing Seats Elevated fishing seats are not intended for use when the boat is traveling faster than idle or trolling speed.
Page 67: Drive Unit Impact Protection
After striking a submerged object, stop the engine as soon as possible and inspect the drive system for any broken or loose parts. If damage is present or suspected, the power package should be taken to an authorized Mercury MerCruiser dealer for a thorough inspection and necessary repair.
Page 68: The Bottom Of The Boat
The boat manufacturer and the selling dealer are responsible for equipping the power package with the correct propeller. Refer to Mercury Marine's web page http://www.mercurymarine.com/everything_you_need_to_know_about_propellers6. Select a propeller that will allow the engine power package to operate at or near the top end of the recommended WOT operating RPM range with a normal load.
Page 69: Getting Started
End of First Season Checkup At the end of the first season of operation, contact an authorized Mercury MerCruiser dealer to discuss and/or perform scheduled maintenance items. If you are in an area where the product is operated continuously, year‑round, you should contact your dealer at the end of the first 100 hours of operation or once yearly, whichever occurs first.
Page 70 Section 3 - On the Water Notes: Page 62 90-8M0050539 MAY 2011...
Page 71 Gasoline Containing Alcohol ......... 64 ECT................69 Engine Oil..............64 Engine—350/377 MAG and SeaCore 350/377 MAG..69 350 MAG ECT, SeaCore 350 MAG ECT....... 65 Alpha Sterndrive............70 377 MAG ECT, SeaCore 377 MAG ECT....... 66 Bravo Sterndrives............70 350/377 MAG and SeaCore 350/377 MAG—Specifications Power‑Assisted Steering and Power Trim Fluids..
Page 72: 350/377 Mag Ect And Seacore 350/377 Ect-Specifications
Using Reformulated (Oxygenated) Gasoline (USA Only) Reformulated gasoline is required in certain areas of the USA and are acceptable for use in your Mercury MerCruiser engine. The two types of oxygenates used in these fuels are alcohol (ethanol) and ether (MTBE or ETBE). If ethanol is the oxygenate that is used in the gasoline in your area, refer to Gasoline Containing Alcohol.
Page 73: 350 Mag Ect, Seacore 350 Mag Ect
Catalysts damaged by lubricants containing high levels of phosphorus may not be covered by the MerCruiser Limited Warranty. If Mercury MerCruiser Full‑Synthetic, 20W‑40 oil is unavailable, use the following lubricants, listed in order of recommendation. If you are servicing a catalyst engine, use these for short periods of time only.
Page 74: 377 Mag Ect, Seacore 377 Mag Ect
Fuel Ratings Mercury MerCruiser engines will operate satisfactorily when using a major brand of unleaded gasoline meeting the following specifications: USA and Canada—having a posted pump Octane Rating of 87 (R+M)/2 minimum. Premium gasoline 92 (R+M)/2 Octane is also acceptable.
Page 75: Using Reformulated (Oxygenated) Gasolines (Usa Only)
The fuel system components on your Mercury MerCruiser engine will withstand up to 10% alcohol content in the gasoline. We do not know what percentage your boat's fuel system will withstand. Contact your boat manufacturer for specific recommendations on the boat's fuel system components (fuel tanks, fuel lines, and fittings).
Page 76: 350 Mag, Seacore 350 Mag
NOTE: We do not recommend non‑detergent oils, multi‑viscosity oils (other than as specified), non FC‑W–rated synthetic oils, low‑quality oils, or oils that contain solid additives. Mercury Full-Synthetic MerCruiser Engine Oil, 20W-40, NMMA FC-W rated MerCruiser/Quicksilver 25W-40 Synthetic Blend, NMMA FC-W rated 4-cycle MerCruiser oil...
Page 77: 377 Mag, Seacore 377 Mag
Seawater cooling system (winterization 20 L (21 US qt) Propylene glycol and purified water use only) Mercury Extended Life Coolant Antifreeze or extended life Closed cooling system 18 L (19 US qt) ethylene glycol 5/100 antifreeze mixed 50/50 with purified water Engine—350/377 MAG and SeaCore 350/377 MAG...
Page 78: Alpha Sterndrive
350 MAG and 377 MAG models Capacity Fluid Type Engine oil (with filter) 4.25 L (4.5 US qt) Mercury MerCruiser Full‑Synthetic Engine Oil, 20W‑40 Seawater cooling system (winterization use 20 L (21 US qt) Propylene glycol and purified water only) Mercury Extended Life Coolant Antifreeze or extended‑life...
Page 79: Section 5 - Maintenance
Section 5 - Maintenance Section 5 - Maintenance Table of Contents Additional Operation Instructions for Axius Systems ... 73 Checking ............... 92 Owner/Operator Responsibilities.......... 73 Filling ................92 Dealer Responsibilities............73 Changing ..............93 Maintenance................. 73 Battery.................. 93 Do‑It‑Yourself Maintenance Suggestions......73 Multiple EFI Engine Battery Precautions.......
Page 80 Section 5 - Maintenance Flushing the Power Package—Bravo......... 116 Sterndrive Water Pickups ........117 General Information............. 116 Alternative Water Pickups ........118 Flushing the Power Package........116 SeaCore Power Package Flushing Procedure.... 120 Flushing Attachments .......... 116 Models Using The Sterndrive Water Pickup ..120 Page 72 90-8M0050539 MAY 2011...
Page 81: Additional Operation Instructions For Axius Systems
It is the operator's responsibility to perform all safety checks, to ensure that all lubrication and maintenance instructions are complied with for safe operation and to return the unit to an authorized Mercury MerCruiser dealer for a periodic checkup. Normal maintenance service and replacement parts are the responsibility of the owner/operator and as such, are not considered defects in workmanship or material within the terms of the warranty.
Page 82: Inspection
Check plug leads and electrical leads for damage. • Remove and inspect the propeller. If badly nicked, bent or cracked, contact your authorized Mercury MerCruiser dealer. • Repair nicks and corrosion damage on power package exterior finish. Contact your authorized Mercury MerCruiser dealer.
Page 83: Scheduled Maintenance
Section 5 - Maintenance Task Interval Maintenance to Be Performed • Remove the propeller and lubricate the propeller shaft and torque the nut. (If operating only in freshwater, you can extend the interval to every four months.) • If operating in saltwater, brackish water, or polluted water, apply Corrosion Guard to the power Every two months or 50 package.
Page 84: Maintenance Schedules-350/377 Mag And Seacore 350/377 Mag
• Lubricate the U‑joint splines and cross bearing, if equipped with a grease fitting. • Inspect the gimbal bearing for roughness. Replace if necessary. See your certified Mercury MerCruiser dealer. • Alpha models and Bravo models: Lubricate the engine coupler.
Page 85: Scheduled Maintenance
Section 5 - Maintenance Task Interval Maintenance to Be Performed • Remove the propeller and lubricate the propeller shaft and torque the nut. (If operating only in freshwater, you can extend the interval to every four months.) • If operating in saltwater, brackish water, or polluted water, apply Corrosion Guard to the power Every two months or 50 package.
Page 86: Maintenance Log
• Lubricate the U‑joint splines and cross bearing, if equipped with a grease fitting. • Inspect the gimbal bearing for roughness. Replace if necessary. See your certified Mercury MerCruiser dealer. • Vazer models, Alpha models, and 496 MAG Bravo models only: Lubricate the engine coupler.
Page 87: Engine Oil-350/377 Mag Ect And Seacore 350/377 Mag Ect
Section 5 - Maintenance Engine Oil—350/377 MAG ECT and SeaCore 350/377 MAG ECT Checking NOTICE Discharge of oil, coolant, or other engine/drive fluids into the environment is restricted by law. Use caution not to spill oil, coolant, or other fluids into the environment when using or servicing your boat. Be aware of the local restrictions governing the disposal or recycling of waste, and contain and dispose of fluids as required.
Page 88: Changing Oil And Filter
Fluid type All Models 4.25 L (4.50 US qt) Mercury MerCruiser Full‑Synthetic Engine Oil, 20W‑40 Changing Oil and Filter Refer to the Maintenance schedule for the change interval. Engine oil should be changed before placing the boat in storage. IMPORTANT: Change engine oil when the engine is warm from operation. Warm oil flows more freely, carrying away more impurities.
Page 89: Engine Oil-350/377 Mag And Seacore 350/377 Mag
Add the specified engine oil to bring the level up to, but not over, the full or OK range mark on the dipstick. Recheck oil level. Replace the fill cap. Engine Model Engine Oil Capacity Fluid type 350 MAG and SeaCore 350 MAG 4.25 L (4.5 US qt) Mercury MerCruiser Full‑Synthetic Engine Oil, 20W‑40 377 MAG and SeaCore 377 MAG 90-8M0050539...
Page 90: Changing Oil And Filter
NOTE: Adding 0.95 L (1 qt) of engine oil will raise the level from the add mark to the top of the OK range. Engine Model Engine Oil Capacity Fluid type 350 MAG and SeaCore 350 MAG 4.25 L (4.5 US qt) Mercury MerCruiser Full‑Synthetic Engine Oil, 20W‑40 377 MAG and SeaCore 377 MAG...
Page 91: Power Steering Fluid
Warm range 33202 Fill to full line with specified fluid. IMPORTANT: If fluid is not visible in pump, contact your authorized Mercury MerCruiser dealer. Filling Remove the fill cap/dipstick and observe the level. Add Quicksilver Power Trim and Steering Fluid or Dexron III Automatic Transmission Fluid (ATF) to bring the fluid level up to the proper level.
Page 92: Filling
Warm range 6100 Fill to full line with specified fluid. IMPORTANT: If fluid is not visible in pump, contact your authorized Mercury MerCruiser dealer. Filling Remove the fill cap/dipstick and observe the level. Add Quicksilver Power Trim and Steering Fluid or Dexron III Automatic Transmission Fluid (ATF) to bring the fluid level up to the proper level.
Page 93: Filling
Heat exchanger cap The coolant level in the heat exchanger should be at the bottom of the filler neck. If the coolant level is low, contact your authorized Mercury MerCruiser dealer. Install the cap onto the heat exchanger. IMPORTANT: When reinstalling the pressure cap, be sure to tighten it until it seats on the filler neck.
Page 94: Changing
Check the antifreeze concentration for adequate freeze protection and correct if necessary. Refer to the Specifications section. Install the fill cap to the coolant recovery bottle. Changing Contact your authorized Mercury MerCruiser dealer. Engine Coolant—350/377 MAG and SeaCore 350/377 MAG Checking CAUTION A sudden loss of pressure can cause hot coolant to boil and discharge violently resulting in serious injury from burns.
Page 95: Filling
Coolant Install the fill cap onto the coolant recovery bottle. Changing Contact your authorized Mercury MerCruiser dealer. Alpha Sterndrive Gear Lube NOTICE Discharge of oil, coolant, or other engine/drive fluids into the environment is restricted by law. Use caution not to spill oil, coolant, or other fluids into the environment when using or servicing your boat.
Page 96: Checking
IMPORTANT: If more than 59 ml (2 fl. oz.) of gear lubricant is required to fill the monitor, a seal may be leaking. Damage to the sterndrive unit may occur due to lack of lubrication. Contact your authorized Mercury MerCruiser dealer.
Page 97 92-858064K01 Lubricant IMPORTANT: Use only Mercury/Quicksilver High Performance Gear Lubricant in sterndrive unit. Install the oil vent screw and sealing washer. Continue to pump gear lubricant into the drive through the oil fill and drain plug hole until gear lubricant appears in the gear lube monitor.
Page 98: Sterndrive Gear Lube
Inspect the lubricant condition. If any water is visible at the bottom of the gear lube monitor, if water appears at the fill and drain plug hole, or if the gear lube appears discolored, contact your authorized Mercury MerCruiser dealer immediately. These conditions can indicate a water leak in the sterndrive.
Page 99 Lower the sterndrive unit so the propeller shaft is level. IMPORTANT: Use only Mercury/Quicksilver High Performance Gear Lubricant in sterndrive unit. Fill the sterndrive unit through the oil fill and drain hole with specified gear lubricant until an air‑free stream of lubricant flows from oil vent hole.
Page 100: Power Trim Fluid
Section 5 - Maintenance 10. Continue to pump gear lubricant into the drive through the oil fill and drain hole until gear lubricant appears in the gear lube monitor. 11. Fill the monitor so that the oil level is in the operating range. Do not overfill. 12.
Page 101: Changing
Section 5 - Maintenance Changing Power trim fluid does not require changing unless it becomes contaminated with water or debris. Contact your authorized Mercury MerCruiser dealer. Battery Refer to specific instructions and warnings accompanying your battery. If this information is not available, observe the following precautions when handling a battery.
Page 102: Positive Crankcase Ventilation Valve (Pcv)
10. Connect the crankcase ventilation hose to the fitting on the flame arrestor and valve cover. 11. Install the engine cover. Positive Crankcase Ventilation Valve (PCV) Changing NOTE: We recommend the use of Mercury MerCruiser replacement parts to ensure compliance with emission regulations. Page 94 90-8M0050539 MAY 2011...
Page 103: Cleaning The Iac Muffler
Section 5 - Maintenance Remove the PCV valve from the port valve cover. PCV valve (hose not shown) 33143 Disconnect the PCV valve from the hose and discard the valve. Install a new PCV valve in the valve cover and reconnect the hose. Ensure that the PCV valve is tightly seated in the valve cover.
Page 104: Scheduled Maintenance Specifically For 350/377 Mag And
Section 5 - Maintenance Scheduled Maintenance Specifically for 350/377 MAG and SeaCore 350/377 Cleaning the Flame Arrestor WARNING Fuel is flammable and explosive. Ensure that the key switch is off and the lanyard is positioned so that the engine cannot start. Do not smoke or allow sources of spark or open flame in the area while servicing.
Page 105: Positive Crankcase Ventilation Valve (Pcv)
Positive Crankcase Ventilation Valve (PCV) Changing NOTE: We recommend the use of Mercury MerCruiser replacement parts to ensure compliance with emission regulations. NOTE: On V6 models the PCV valve is non‑serviceable and is an internal component of the valve cover.
Page 106: Installation
Section 5 - Maintenance NOTE: Mercury MerCruiser recommends that the engine be shut off for 12 hours prior to filter removal. Close the fuel supply valve, if equipped. Wrap the water‑separating fuel filter with a cloth to help catch any fuel spills or spray.
Page 107: Installation
10. Start the engine. Check for gasoline leaks around the fuel filter assembly. If leaks exist, stop the engine immediately. Recheck the filter installation, clean spilled fuel and properly ventilate the engine compartment. If leaks continue, stop engine immediately and contact your authorized Mercury MerCruiser dealer. Lubrication...
Page 108 Section 5 - Maintenance If Steering Cable Has Grease Fittings: Turn steering wheel until steering cable is fully retracted into cable housing. Apply approximately 3 pumps of grease from a typical hand‑operated grease gun. Steering cable grease fitting 6221 Tube Ref No. Description Where Used Part No.
Page 109: Throttle Cable
Section 5 - Maintenance Tube Ref. No. Description Where Used Part No. Synthetic Blend MerCruiser Engine Oil Tie bar pivot points 92‑883725K01 SAE25W‑40 Upon first starting engine, turn steering wheel several times to starboard and then port to ensure that the steering system operates properly before getting underway.
Page 110: Sterndrive U-Joint Shaft Splines And O-Rings
Section 5 - Maintenance Sterndrive U‑joint Shaft Splines And O‑rings (Sterndrive Unit Removed) Coat sterndrive U‑joint O‑rings and driveshaft splines with grease. Driveshaft splines U‑joint O‑rings (3) 8591 Tube Ref No. Description Where Used Part No. Engine Coupler Spline Driveshaft splines and U-joint O-rings 92-802869A 1 Grease For propeller shaft lubrication, refer to Propellers.
Page 111: Driveshaft Extension Models
Propellers Propeller Repair Some damaged propellers can be repaired. Contact your authorized Mercury MerCruiser dealer. Alpha Propeller Removal WARNING Rotating propellers can cause serious injury or death. Never operate the boat out of the water with a propeller installed. Before installing or removing a propeller, place the drive unit in neutral and engage the lanyard stop switch to prevent the engine from starting.
Page 112: Bravo One Propeller Removal
Section 5 - Maintenance IMPORTANT: If reusing tab washer, carefully inspect tabs for cracks or other damage. Replace tab washer if condition is questionable. Propeller shaft Thrust hub Flo‑Torq II drive hub Propeller Drive sleeve Locking tab washer Propeller nut 6215 Apply a liberal coat of one of the following lubricants to the propeller shaft.
Page 113: Bravo Two Propeller Removal
Section 5 - Maintenance IMPORTANT: If reusing tab washer, carefully inspect tabs for cracks or other damage. Replace tab washer if condition is questionable. Propeller shaft Thrust hub Flo‑Torq II drive hub Propeller Drive sleeve Locking tab washer Propeller nut 6215 Slide thrust hub onto propeller shaft, with stepped side toward propeller hub.
Page 114: Bravo Two Propeller Installation
Section 5 - Maintenance Bravo Two Propeller Installation NOTICE Operating the engine with a loose propeller can damage the propeller, the drive, or drive components. Always tighten the propeller nut or nuts to specification and check for tightness periodically and at the required maintenance interval. IMPORTANT: If reusing tab washer, carefully inspect tabs for cracks or other damage.
Page 115: Bravo Three Propeller Installation
Slide propeller and thrust hub off propeller shaft. Turn front propeller shaft nut 70 mm (2‑3/4 in.) counterclockwise to remove nut. Slide propeller and thrust hub off propeller shaft. NOTE: Some damaged propellers can be repaired. Contact your authorized Mercury MerCruiser dealer. Rear propeller nut Rear propeller...
Page 116 Section 5 - Maintenance Tube Ref No. Description Where Used Part No. Special Lubricant 101 Propeller shaft 92-802865Q02 Anti-Corrosion Grease Propeller shaft 92-802867Q 1 2-4-C Marine Lubricant Propeller shaft 92-802859A 1 with Teflon Align splines and place propeller on propeller shaft. Install and torque the propeller nut.
Page 117: Serpentine Drive Belt
Section 5 - Maintenance Serpentine Drive Belt WARNING Inspecting the belts with the engine running may cause serious injury or death. Turn off the engine and remove the ignition key before adjusting tension or inspecting belts. 6117 6116 With a seawater pump Without a seawater pump Idler pulley Water circulating pump pulley...
Page 118: Corrosion Protection
MerCathode System Battery Requirements The Mercury MerCruiser MerCathode system requires a minimum battery charge of 12.6 volts at all times to maintain functionality. Boats equipped with a MerCathode system that use shore power, and are not run for a long period of time, must use a battery charger to maintain a minimum battery charge of 12.6 volts or above.
Page 119: Checking The Quicksilver Mercathode System
Checking the Quicksilver MerCathode System The MerCathode system should be tested to ensure adequate output. Perform the test where boat is moored, using the reference electrode and test meter. Contact your authorized Mercury MerCruiser dealer for service and information . 90-8M0050539...
Page 120: Power Package Exterior Surfaces
Clean the entire power package. External surfaces that have become bare should be repainted with the recommended primer and spray paint at recommended intervals. Description Part Number Mercury Light Gray Primer 92‑802878 52 Painted surfaces Mercury Phantom Black 92‑802878Q 1 Boat Bottom Care To achieve maximum performance and fuel economy, the boat bottom must be kept clean.
Page 121 If you are using copper based anti‑fouling paint, observe the following precaution: • Avoid an electrical interconnection between the Mercury MerCruiser Product, Anodic Blocks, or MerCathode System and the paint by allowing a minimum of 40 mm (1‑1/2 in.) UNPAINTED area on transom of the boat around these items.
Page 122: Sterndrive Surface Care
Maintain a complete paint covering on the sterndrive. • Check the finish regularly. Prime and paint nicks and scratches using Mercury enamel paint and touch up paint. Use only tin– based anti–fouling paint or its equivalent on or near aluminum surfaces below the waterline.
Page 123: Flushing Attachments
9192 Sterndrive Water Pickups This Mercury MerCruiser sterndrive is equipped with side water pickups. Side pickups require the flushing attachment (44357Q 5773 Side Pickup NOTE: Flushing is needed only for salty, brackish, mineral‑laden, or polluted water applications. Flushing is recommended after each outing for best results.
Page 124: Flushing The Power Package-Bravo
Flushing the Power Package—Bravo General Information Your authorized Mercury MerCruiser dealer can explain how to properly flush your power package. Flushing the Power Package The boat can be equipped with a combination of any of three different types of water pickups: through the hull, through the transom, and through the sterndrive.
Page 125: Sterndrive Water Pickups
Sterndrive Water Pickups There are two types of water pickups available on Mercury MerCruiser sterndrives: dual water, and side water pickups. Dual water pickups require the flushing attachment (44357Q 2) and the flush seal kit (881150K 1), and side water pickups require the flushing attachment (44357Q 2).
Page 126: Alternative Water Pickups
Section 5 - Maintenance On models using the sterndrive water pickups for water supply: Proceed to Step 4. or Step 5. If flushing the cooling system with the boat in the water: Raise sterndrive to trailer position. Install the appropriate flushing attachment over the water inlet holes in the gear housing. Lower sterndrive to full down (in) position.
Page 127 Section 5 - Maintenance Remove the seawater inlet hose from the seawater pump at the location shown. Plug the hose to prevent water from siphoning into the engine or boat. 33208 Seawater inlet hose connection—350/377 MAG ECT and SeaCore 350/377 MAG ECT 6147 Seawater inlet hose connection—350/377 MAG and SeaCore 350/377 MAG Using a suitable adapter, connect the flushing hose from the water source to the water inlet of the seawater pump.
Page 128: Seacore Power Package Flushing Procedure
Section 5 - Maintenance SeaCore Power Package Flushing Procedure NOTE: Flushing is needed only for salt, brackish, mineral laden or polluted water applications. Flushing is recommended after each outing for best results. IMPORTANT: Flushing the SeaCore power package with the boat and sterndrive in the water is less effective. Flushing the SeaCore power package is most effective when performed with the boat and sterndrive out of the water, such as on a boat lift or trailer.
Page 129 Section 5 - Maintenance Snap the quick‑connect fitting with the water hose into the flush socket on the engine. Water hose Quick‑connect fitting (water hose end) Flush socket 18489 Open the water source of the water hose to a full flow. Allow the water to flush the sterndrive for 30 seconds.
Page 130 IMPORTANT: Do not store the quick‑connect fitting in the flush socket on the engine. Doing so would allow the seawater pump to suck air during engine operation causing an overheating problem. Damages due to engine overheating are not covered by Mercury MerCruiser Warranty. Quick-connect fitting stored in the boat Quick‑connect fitting (water hose end)
Page 131: Section 6 - Storage
Air Actuated Single Point Drain System ....136 Draining the Seawater System—350/377 MAG ECT and Manual Single Point Drain System ...... 137 SeaCore 350 MAG ECT............. 125 Three Point Manual Drain System ...... 137 Draining the Seawater System........125 Multi‑Point Drain (MPD) System ......137 Drain System Identification..........
Page 132: Cold Weather Or Extended Storage
If the boat is to be placed in storage with fuel containing alcohol in fuel tanks (if fuel without alcohol is not available): Fuel tanks should be drained as low as possible and Mercury/Quicksilver Gasoline Stabilizer for Marine Engines added to any fuel remaining in the tank.
Page 133: Draining The Seawater System-350/377 Mag Ect And Seacore 350 Mag Ect
IMPORTANT: The engine must not be operating at any point during the draining procedure. IMPORTANT: Mercury MerCruiser requires that propylene glycol antifreeze, mixed to the manufacturer's instructions, be used in the seawater section of the cooling system for freezing temperatures or extended storage. Make sure that the propylene glycol antifreeze contains a rust inhibitor and is recommended for use in marine engines.
Page 134: Air Actuated Single Point Drain System
Section 6 - Storage Air Actuated Single Point Drain System 33144 33150 Closed-cooled models Seawater-cooled models Blue drain plug location Blue air pump Air manifold Green indicators Manual Single Point Drain System (Alpha) 6128 Blue handle Blue drain plug location Page 126 90-8M0050539 MAY 2011...
Page 135: Three Point Manual Drain System
Section 6 - Storage Three Point Manual Drain System Blue drain plug 6126 Multi-Point Drain (MPD) System Side of cylinder block Bottom of exhaust manifolds 6129 33155 Fuel cooler to thermostat housing Check valve (if equipped) 6131 90-8M0050539 MAY 2011 Page 127...
Page 136: Air Actuated Single Point Drain System
Section 6 - Storage Air Actuated Single Point Drain System Boat in the Water NOTE: This procedure is written for the air pump that is attached to the engine. However, any air source can be used. Close the seacock (if equipped) or remove and plug the water inlet hose. Remove the air pump from the engine.
Page 137 Section 6 - Storage Immediately remove the blue drain plug from the side of the thermostat housing or the heat exchanger. This must be removed within 30 seconds to properly vent the cooling system. 33144 33150 Closed Cooled Models Seawater Cooled Models Blue drain plug location Blue air pump Air manifold...
Page 138: Boat Out Of The Water
12. Remove the air pump from the air manifold and return it to the mounting bracket. 13. Mercury MerCruiser recommends leaving the drain system open while transporting the boat or while performing other maintenance. This helps ensure that all water is drained.
Page 139 Section 6 - Storage Pump air into the system until both green indicators extend and water drains from both sides of the engine. The port side will begin draining before the starboard side. 33144 33150 Closed Cooled Models Seawater Cooled Models Blue drain plug location Blue air pump Air manifold...
Page 140: Manual Single-Point Drain System (Alpha)
Section 6 - Storage 11. Mercury MerCruiser recommends leaving the drain system open while transporting the boat or while performing other maintenance. This helps ensure that all water is drained. 12. Before launching the boat, pull up on the manual release valve. Verify that the green indicators are no longer extended.
Page 141: Boat Out Of The Water
Section 6 - Storage Allow the system to drain for a minimum of five minutes. We recommend leaving the drain system open while transporting the boat or performing other maintenance. Reinstall the blue drain plug in the thermostat housing. Close the drain system by rotating the blue handle clockwise until it stops and install the blue drain plug, if removed. The handle is fully seated when no red is visible.
Page 142: Boat Out Of The Water
Section 6 - Storage Remove the blue drain plug from the distribution housing (lower front, port side). Blue drain plug 6138 To properly vent the cooling system, remove the blue drain plug from the side of the thermostat housing within 30 seconds. Blue drain plug location 6139 Remove the two blue drain plugs from the seawater pickup pump (front, starboard side).
Page 143: Draining The Sterndrive
Section 6 - Storage Remove three blue drain plugs: one from the distribution housing (lower front, port side) and two from the seawater pickup pump (front, starboard side). 6142 Blue drain plug Verify that water is draining from each opening. Allow the system to drain for a minimum of five minutes.
Page 144: Draining The Seawater System-350/377 Mag And Seacore 350/377 Mag
IMPORTANT: Mercury MerCruiser requires that propylene glycol antifreeze, mixed to the manufacturers instructions, be used in the seawater section of the cooling system for freezing temperatures or extended storage. Make sure that the propylene glycol antifreeze contains a rust inhibitor and is recommended for use in marine engines.
Page 145: Manual Single Point Drain System
Section 6 - Storage Manual Single Point Drain System 6128 Blue handle Blue drain plug location Three Point Manual Drain System Blue drain plug 6126 Multi-Point Drain (MPD) System Side of cylinder block Bottom of exhaust manifolds 6129 90-8M0050539 MAY 2011 Page 137...
Page 146: Air Actuated Single Point Drain System
Section 6 - Storage 6130 Water circulating pump hose Fuel cooler to thermostat housing Check valve (if equipped) 6131 Air Actuated Single Point Drain System Boat in the Water NOTE: This procedure is written for the air pump that is attached to the engine. However, any air source can be used. Close the seacock (if equipped) or remove and plug the water inlet hose.
Page 147 12. Remove the air pump from the air manifold and return it to the mounting bracket. 13. Mercury MerCruiser recommends leaving the drain system open while transporting the boat or while performing other maintenance. This helps ensure that all water is drained.
Page 148: Boat Out Of The Water
Section 6 - Storage 14. Before launching the boat, pull up on the manual release valve. Verify that the green indicators are no longer extended. Green indicators 6135 15. Open the seacock, if equipped, or unplug and reconnect the water inlet hose prior to operating the engine. Boat out of the Water NOTE: This procedure is written for the air pump that is attached to the engine.
Page 149 10. Remove the air pump from the air manifold and return it to the mounting bracket. 11. Mercury MerCruiser recommends leaving the drain system open while transporting the boat or while performing other maintenance. This helps ensure that all water is drained.
Page 150: Manual Single-Point Drain System
Section 6 - Storage Manual Single‑Point Drain System Boat in the Water Close the seacock (if equipped) or remove and plug the water inlet hose. Rotate the blue handle counterclockwise until it stops (approximately two turns). The red on the handle shaft indicates that the drain system is open.
Page 151: Three-Point Manual Drain System
Section 6 - Storage Rotate the blue handle counterclockwise until it stops (approximately two turns). The red on the handle shaft indicates that the drain system is open. Do not overtighten the handle, as this action will create new threads. Blue handle 6141 Visually verify that water is draining.
Page 152: Boat Out Of The Water
Section 6 - Storage To properly vent the cooling system, remove the blue drain plug from the side of the thermostat housing within 30 seconds. Blue drain plug location 6139 Remove the two blue drain plugs from the seawater pickup pump (front, starboard side). Blue drain plugs 6140 Verify that water is draining from each opening.
Page 153: Multi-Point Drain (Mpd) System
Section 6 - Storage Multi‑Point Drain (MPD) System Place the boat on a level surface to ensure complete draining of the system. Remove the blue drain plugs from the following locations. It may be necessary to clean out the drain holes using a stiff piece of wire.
Page 154: Draining The Sterndrive
Section 6 - Storage Check valve Drain plug (if equipped) 6131 On models with a seawater pickup pump, remove the two blue drain plugs. If the seawater pickup pump does not have blue drain plugs, or you are unable to access them, loosen the clamps and remove both hoses. 6145 Hose clamps Blue drain plugs...
Page 155: Draining Water From The Gen Iii Cool Fuel Module
Draining Water From the Gen III Cool Fuel Module Mercury MerCruiser recommends draining the Gen III Cool Fuel module if it is equipped with a drain plug. Remove the drain plug from the Gen III Cool Fuel module and allow the water to completely drain from the module.
Page 156: Battery Storage
Section 6 - Storage Battery Storage Whenever the battery will be stored for an extended period of time, be sure the cells are full of water and the battery is fully charged and in good operating condition. It should be clean and free of leaks. Follow the battery manufacturer's instructions for storage. Recommissioning the Power Package Ensure that all cooling system hoses are connected properly and hose clamps are tight.
Page 157: Section 7 - Troubleshooting
Section 7 - Troubleshooting Section 7 - Troubleshooting Table of Contents Diagnosing EFI Problems........... 150 Insufficient Engine Temperature........151 Diagnosing DTS Problems..........150 Low Engine Oil Pressure..........152 Additional Operation Instructions for Axius Systems ..150 Battery Will Not Recharge........... 152 Engine Guardian System............
Page 158: Diagnosing Efi Problems
Diagnosing EFI Problems Your authorized Mercury MerCruiser dealer has the proper service tools for diagnosing problems on Electronic Fuel Injection (EFI) Systems. The Electronic Control Module (ECM) on these engines has the ability to detect some problems with the system when they occur, and store a Trouble Code in the ECM's memory.
Page 159: Engine Runs Rough, Misses, Or Backfires
Clean Flame Arrestor. Faulty ignition system component. Service ignition system. Idle speed too low. Have EFI system checked by an authorized Mercury MerCruiser dealer. EFI System fault. Have EFI System checked by an authorized Mercury MerCruiser dealer. Poor Performance Possible Cause Remedy Throttle not fully open.
Page 160: Low Engine Oil Pressure
Check all throttle linkages. If any are loose or missing, see authorized Loose or missing shift and throttle linkages. Mercury MerCruiser dealer immediately. Straighten cable or have authorized Mercury MerCruiser dealer Shift or throttle cable kinked. replace cable if damaged beyond repair.
Page 161: Power Trim Does Not Operate (Motor Operates But Sterndrive Unit Does Not Move)
Section 7 - Troubleshooting Power Trim Does Not Operate (Motor Operates but Sterndrive Unit Does Not Move) Possible Cause Remedy Trim pump oil level low. Fill pump with oil. Drive unit binding in gimbal ring. Check for obstruction. 90-8M0050539 MAY 2011 Page 153...
Page 162 Section 7 - Troubleshooting Notes: Page 154 90-8M0050539 MAY 2011...
Page 163: Section 8 - Customer Assistance Information
Table of Contents Owner Service Assistance..........156 Resolving a Problem ..........156 Local Repair Service ..........156 Contact Information for Mercury Marine Customer Service Service Away From Home .......... 156 ..................157 Stolen Power Package ..........156 Ordering Literature............. 157 Attention Required After Submersion ......
Page 164: Owner Service Assistance
If your power package is stolen, immediately advise the local authorities and Mercury Marine of the model and serial numbers and to whom the recovery is to be reported. This information is maintained in a database at Mercury Marine to aid authorities and dealers in recovery of stolen power packages.
Page 165: Contact Information For Mercury Marine Customer Service
• Year built United States and Canada For information on additional literature that is available for your particular Mercury MerCruiser power package and how to order that literature contact your nearest dealer or contact us at: Mercury Marine Publications P.O. Box 1939...
Page 166: Outside The United States And Canada
Contact your nearest dealer or Marine Power Service Center for information on additional literature that is available for your particular Mercury MerCruiser power package and how to order that literature. Print or type your mailing address, which be used as your shipping label, and include your order and payment. Mail to:...
Page 167: Section 9 - Checklists
Section 9 - Checklists Section 9 - Checklists Table of Contents Predelivery Inspection (PDI)..........160 Customer Delivery Inspection (CDI)........162 90-8M0050539 MAY 2011 Page 159...
Page 168: Predelivery Inspection (Pdi)
Section 9 - Checklists Predelivery Inspection (PDI) IMPORTANT: This checklist is for packages that are not equipped with Axius. For engine packages equipped with Axius, use the Axius‑specific checklist, which appears in Section 5 of the Axius Operation Manual. Perform these tasks before the Customer Delivery Inspection (CDI). Check/ Item Adjust...
Page 169 Section 9 - Checklists Predelivery Inspection Checklist, Continued Check/ Item Adjust On-the-Water Test ⃞ ⃞ Engine alignment (Inboard models only) ⃞ Starter neutral safety switch operation ⃞ E‑stop switch/lanyard stop switch operation (all helms) ⃞ Seawater pump operation ⃞ Operation of instruments ⃞...
Page 170: Customer Delivery Inspection (Cdi)
⃞ Warranty—provide and explain the limited warranty to the customer. Explain dealer services. ⃞ ⃞ Explain the optional Mercury Product Protection Plan (North America only) Operation of equipment—explain and demonstrate: ⃞ E‑stop switch / lanyard stop switch operation (all helms) ⃞...

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377 magSeacore 377 mag

Mercury 350 MAG Manual

Section 1 - Warranty

Section 4 - Specifications

Section 5 - Maintenance

Section 6 - Storage

Quick Links

Troubleshooting

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Summary of Contents for Mercury 350 MAG

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Table of Contents