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Table of Contents
Related Manuals for Mercury 75 TwoStroke
Summary of Contents for Mercury 75 TwoStroke
- Page 1 Operation Maintenance Installation Manual...
- Page 3 Thank you for purchasing one of our products. We sincerely hope your boating will be pleasant! Mercury Marine, Fond du Lac, Wisconsin, U.S.A. Name / function: John Pfeifer, President, Mercury Marine...
- Page 4 Warranty Message The product you have purchased comes with a limited warranty from Mercury Marine; the terms of the warranty are set forth in the Warranty Manual included with the product. The Warranty Manual contains a description of what is...
- Page 5 Identification Records Please record the following applicable information: Outboard Engine Model and Horsepower Engine Serial Number Gear Ratio Propeller Number Pitch Diameter Hull Identification Number (HIN) Purchase Date Boat Manufacturer Boat Model Length Exhaust Gas Emissions Certification Number (Europe Only)
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Page 7: Table Of Contents
General Information Boater's Responsibilities..................1 Before Operating Your Outboard................ 1 Boat Horsepower Capacity................. 1 High‑Speed and High‑Performance Boat Operation.......... 2 Outboard Remote Control Models ..............2 Remote Steering Notice..................3 Lanyard Stop Switch................... 3 Protecting People in the Water................6 Passenger Safety Message ‑... - Page 8 Features and Controls Remote Control Features................. 24 Warning System....................25 Engine Overspeed Limiter................26 Power Trim and Tilt (If equipped)..............27 Manual Tilt System................... 30 Throttle Grip Friction Adjustment ‑ Tiller Handle Models........34 Steering Friction Adjustment ‑ Tiller Handle Models......... 34 Trim Tab Adjustment..................
- Page 9 Maintenance Cleaning Care Recommendations..............47 Inspection and Maintenance Schedule............. 49 Flushing the Cooling System................50 Flushing the Cooling System ‑ Models with Accessory Hose Flush Attachment .......................... 51 Top Cowl Removal and Installation..............52 Battery Inspection .................... 53 Fuel System...................... 53 Steering Link Rod Fasteners................
- Page 10 Engine Installation Mercury Marine Validated Engine Mounting Hardware........75 Accessories Mounted to the Transom Clamp Bracket........75 Fastening the Outboard to the Transom............79 Installing Outboard.................... 84 Maximum Outboard Mounting Height............... 85 Maintenance Log Maintenance Log....................86 viii...
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Page 11: General Information
GENERAL INFORMATION Boater's Responsibilities The operator (driver) is responsible for the correct and safe operation of the boat and the safety of its occupants and general public. It is strongly recommended that each operator read and understand this entire manual before operating the outboard. -
Page 12: High-Speed And High-Performance Boat Operation
For additional information, obtain a copy of our Hi‑Performance Boat Operation booklet from your dealer, distributor, or Mercury Marine. Outboard Remote Control Models The remote control connected to your outboard must be equipped with a start in neutral only protection device. -
Page 13: Remote Steering Notice
GENERAL INFORMATION Remote Steering Notice WARNING Improper fasteners or improper installation procedures can result in loosening or disengagement of the steering link rod. This can cause a sudden, unexpected loss of boat control, resulting in serious injury or death due to occupants being thrown within or out of the boat. Always use required components and follow instructions and torque procedures. - Page 14 GENERAL INFORMATION The lanyard cord is usually 122–152 cm (4–5 feet) in length when stretched out, with an element on one end made to be inserted into the switch and a clip on the other end for attaching to the operator's PFD or wrist. The lanyard is coiled to make its at‑rest condition as short as possible to minimize the likelihood of lanyard entanglement with nearby objects.
- Page 15 GENERAL INFORMATION While activation of the lanyard stop switch will stop the engine immediately, a boat will continue to coast for some distance depending upon the velocity and degree of any turn at shut down. However, the boat will not complete a full circle.
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Page 16: Protecting People In The Water
GENERAL INFORMATION Protecting People in the Water WHILE YOU ARE CRUISING It is very difficult for a person standing or floating in the water to take quick action to avoid a boat heading in his/her direction, even at slow speed. 21604 Always slow down and exercise extreme caution any time you are boating in an area where there might be people in the water. - Page 17 GENERAL INFORMATION Persons on the front deck could easily be thrown overboard or persons dangling their feet over the front edge could get their legs caught by a wave and pulled into the water. 26782 WARNING Sitting or standing in an area of the boat not designed for passengers at speeds above idle can cause serious injury or death.
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Page 18: Wave And Wake Jumping
GENERAL INFORMATION Wave and Wake Jumping Operating recreational boats over waves and wake is a natural part of boating. However, when this activity is done with sufficient speed to force the boat hull partially or completely out of the water, certain hazards arise, particularly when the boat enters the water. - Page 19 GENERAL INFORMATION Reduce speed and proceed with caution whenever you drive a boat in shallow water areas or in areas where you suspect underwater obstacles may exist that could be struck by the outboard or the boat bottom. The most significant action you can take to help reduce injury or impact damage from striking a floating or underwater object is to control the boat speed.
- Page 20 Operating a boat or engine with impact damage can result in product damage, serious injury, or death. If the vessel experiences any form of impact, have an authorized Mercury Marine dealer inspect and repair the vessel or power package. SAFETY INSTRUCTIONS FOR HAND-TILLED OUTBOARDS No person or cargo should occupy the area directly in front of the outboard while the boat is in motion.
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Page 21: Exhaust Emissions
GENERAL INFORMATION Exhaust Emissions BE ALERT TO CARBON MONOXIDE POISONING Carbon monoxide (CO) is a deadly gas that is present in the exhaust fumes of all internal combustion engines, including the engines that propel boats, and the generators that power boat accessories. By itself, CO is odorless, colorless, and tasteless, but if you can smell or taste engine exhaust, you are inhaling Early symptoms of carbon monoxide poisoning, which are similar to the symptoms of seasickness and intoxication, include headache, dizziness,... - Page 22 GENERAL INFORMATION Example of desired air flow through the boat: 21622 POOR VENTILATION Under certain running and/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.
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Page 23: Selecting Accessories For Your Outboard
Some accessories not manufactured or sold by Mercury Marine are not designed to be safely used with your outboard or outboard operating system. Acquire and read the installation, operation and maintenance manuals for all your selected accessories. - Page 24 (refer to your boat's capacity plate). Know your boat's operating and loading limitations. Know if your boat will float if it is full of water. When in doubt, contact your authorized Mercury Marine dealer or the boat manufacturer. Ensure that everyone in the boat is properly seated.
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Page 25: Recording Serial Number
GENERAL INFORMATION • 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. No passengers, load, or fishing seats should block the operator's view when the boat is above idle or planing transition speed. -
Page 26: 75/90 Specifications
GENERAL INFORMATION 75/90 Specifications Models Horsepower Kilowatts Full throttle RPM range 4750–5250 5000–5500 Idle speed in forward gear 650–700 RPM Number of cylinders Piston displacement 1385.8 cc (84.57 in³) Cylinder bore 88.9 mm (3.500 in.) Stroke 74 mm (2.930 in.) Recommended spark plug NGK BUZHW‑2 Spark plug gap... -
Page 27: Component Identification
GENERAL INFORMATION Component Identification 3125 Top cowl Bottom cowl Water pump indicator hole Driveshaft housing Anti‑ventilation plate Trim tab Gearcase Cooling water intake Transom bracket Auxiliary tilt switch Hose flush attachment (if equipped) Shift handle Lanyard stop switch Steering friction adjustment knob Tilt lock lever... -
Page 28: Transporting
TRANSPORTING Trailering Boat/Outboard Trailer your boat with the outboard tilted down in a vertical operating position. If additional ground clearance is required, the outboard should be tilted up using an accessory outboard support device. Refer to your local dealer for recommendations. -
Page 29: Fuel And Oil
USA is alcohol (ethanol, methanol, or butanol). GASOLINE CONTAINING ALCOHOL Bu16 Butanol Fuel Blends Fuel blends of up to 16.1% butanol (Bu16) that meet the published Mercury Marine fuel rating requirements are an acceptable substitute for unleaded gasoline. Contact your boat manufacturer for specific recommendations on your boat's fuel system components (fuel tanks, fuel lines, and fittings). -
Page 30: Oil Recommendation
Mercury or Quicksilver Premium TC‑W3 2‑Cycle oil is recommended for this engine. For added protection and lubrication, Mercury or Quicksilver Premium Plus TC‑W3 2‑Cycle oil is recommended. If Mercury or Quicksilver outboard oil is not available, substitute another brand of 2‑cycle outboard oil that is NMMA Certified TC‑W3. -
Page 31: Filling Oil Injection System
FUEL AND OIL MODELS WITHOUT OIL INJECTION Use a 25:1 (4%) gasoline/oil mixture in the first tank of fuel. After the break‑in fuel mixture is used up, use a 50:1 (2%) gasoline/oil mixture. Follow the table for mixing ratios. GASOLINE/OIL MIXING RATIO CHART Gas/Oil Ratio 3.8 liters (1 gal) gas 11.5 liters (3 gal) gas 23 liters (6 gal) gas 148 ml (5 fl oz) oil 473 ml (16 fl oz) oil... -
Page 32: Filling Remote Oil Tank (If Equipped)
29465 Model Capacity Fluid Type Mercury or Quicksilver Premium TC‑W3 3 cylinder 3 liters (3.2 qt.) 2‑Cycle 6. Install oil filler cap and retighten. Reinstall the cowl cap. -
Page 33: Filling Fuel Tank
FUEL AND OIL Capacity Fluid Type Mercury or Quicksilver Premium 2‑cycle Oil tank 11.5 liters (3 gal) TC‑W3 outboard oil 2. Reinstall filler cap and tighten securely. 3. Check oil level in the engine oil injection tank. The oil level should be 1/2 full to completely full. -
Page 34: Features And Controls
FEATURES AND CONTROLS Remote Control Features Your boat may be equipped with one of the Mercury Precision or Quicksilver remote controls shown. If not, consult your dealer for a description of the functions and operations of the remote control. 26800 Control handle –... -
Page 35: Warning System
FEATURES AND CONTROLS Warning System The outboard warning system incorporates a warning horn inside the boat. Remote control models will have the warning horn located inside the remote control or connected to the ignition key switch. 27755 Warning horn inside remote control Warning horn inside key switch Tiller handle models will have the warning horn located below the tiller handle. -
Page 36: Engine Overspeed Limiter
FEATURES AND CONTROLS ENGINE OVERHEAT If the engine overheats, immediately reduce throttle speed to idle. Shift outboard into neutral and check for a steady stream of water coming out of the water pump indicator hole. 19805 If no water is coming out of the water pump indicator hole or flow is intermittent, stop engine and check the cooling water intake holes for obstruction. -
Page 37: Power Trim And Tilt (If Equipped)
FEATURES AND CONTROLS • Propeller ventilation. • A propeller which has an incorrect pitch or diameter. • Propeller hub slippage. • Outboard mounted too high on the transom. • Tilting the outboard out beyond a vertical position. • Cavitation of the propeller due to rough water or obstruction in the boat hull. - Page 38 FEATURES AND CONTROLS POWER TRIM OPERATION With most boats, operating around the middle of the trim range will give satisfactory results. However, to take full advantage of the trimming capability there may be times when you choose to trim your outboard all the way in or out.
- Page 39 FEATURES AND CONTROLS • Increase clearance over submerged objects or a shallow bottom. • Increase steering torque or pull to the left at a normal installation height (with the normal right‑hand rotation propeller.) • In excess, can cause boat porpoising (bouncing) or propeller ventilation.
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Page 40: Manual Tilt System
FEATURES AND CONTROLS 2. Tilt the outboard to the desired position and tighten the manual tilt release valve. AUXILIARY TILT SWITCH The auxiliary tilt switch can be used to tilt the outboard up or down using the power trim system. Auxiliary tilt switch 27779 SHALLOW WATER OPERATION... - Page 41 FEATURES AND CONTROLS BASIC TILTING OPERATION Move tilt lock lever to the tilt position. Tilt outboard to desired position and lock in place by moving the tilt lock lever back to the lock/run position. Tilt position Lock/run position 26802 SHALLOW WATER OPERATION When operating the boat in shallow water, the outboard can be adjusted and locked at a higher tilt angle.
- Page 42 FEATURES AND CONTROLS 2. Engage the tilt support lever by rotating knob to bring the tilt support lever upward. Tilt support lever Knob 26805 3. Lower outboard to rest on the tilt support lever. Lowering To Run Position 1. Disengage the tilt support lever by raising the outboard off the tilt support lever and rotating the lever down.
- Page 43 FEATURES AND CONTROLS Arrange passengers and load in the boat so the weight is distributed evenly. 3123 Too much angle (stern down ‑ bow up) Not enough angle (stern up ‑ bow down) Angle adjusted properly (bow slightly up) Consider the following lists carefully when adjusting the operating angle of your outboard.
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Page 44: Throttle Grip Friction Adjustment - Tiller Handle Models
FEATURES AND CONTROLS • In excess can cause boat porpoising (bouncing) or propeller ventilation. Throttle Grip Friction Adjustment ‑ Tiller Handle Models Turn the wing nut to set and maintain the throttle at desired speed. 29172 Steering Friction Adjustment ‑ Tiller Handle Models WARNING Insufficient friction adjustment can cause serious injury or death due to loss of boat control. -
Page 45: Trim Tab Adjustment
FEATURES AND CONTROLS Trim Tab Adjustment Propeller steering torque will cause your boat to pull in one direction. This steering torque is a normal result from your outboard not trimmed with the propeller shaft parallel to the water surface. The trim tab can help to compensate for this steering torque in many cases and can be adjusted within limits to reduce any unequal steering effort. -
Page 46: Operation
OPERATION Important Daily Inspection Before Each Use Any outboard mounted on the boat must have the mounting hardware inspected and checked to ensure that the hardware has not become loose. A decal on the transom bracket reminds the owner to check the fasteners securing the outboard to the transom before each use. -
Page 47: Operating In Freezing Temperatures
Wash the outboard exterior and flush out the exhaust outlet of the propeller and gearcase with fresh water after each use. Each month, spray Mercury Precision or Quicksilver Corrosion Guard on external metal surfaces. Do not spray on corrosion control anodes as this will reduce the effectiveness of the anodes. -
Page 48: Operating At High Elevations
OPERATION • Change gear ratio. Some boat performance can be improved by dropping to a lower pitch propeller, but engine performance will still remain lower. In some cases, a gear ratio reduction may be more beneficial. To optimize engine performance, prop the engine to allow it to operate at or near the top end of the recommended maximum RPM range at wide‑open throttle with a normal boat load. - Page 49 OPERATION NOTICE Without sufficient cooling water, the engine, the water pump, and other components will overheat and suffer damage. Provide a sufficient supply of water to the water inlets during operation. 1. Lower the outboard to the vertical operating position. Make sure all cooling water intake holes are submerged.
- Page 50 OPERATION 5. Set the lanyard stop switch to the RUN position. Refer to General Information ‑ Lanyard Stop Switch. 19791 6. Shift outboard to neutral (N) position. 29176 26838 7. Model without power trim ‑ Position tilt lock lever to the lock/run position. Tilt position Lock/run position 26802...
- Page 51 OPERATION a. Remote control models ‑ Advance the fast idle speed lever of throttle only feature to an approximate halfway setting. After engine start up, immediately adjust neutral fast idle setting so engine speed drops below 2000 RPM. Return back to normal idle speed after engine is warmed up.
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Page 52: Gear Shifting
OPERATION WARNING Rapid acceleration can result in serious injury or death from being thrown within or out of the boat. Decrease engine speed before shifting into gear. 12. Manual start models ‑ Pull starter rope. 3072 13. After engine starts, check for a steady stream of water flowing out of the water pump indicator hole. -
Page 53: Stopping The Engine
OPERATION • Remote control models—always stop at the neutral position to allow the engine idle speed to stabilize before shifting into another gear. • Tiller handle models—reduce the engine speed to idle before shifting into another gear. • Always shift the outboard into gear with a quick motion. •... - Page 54 OPERATION 1. Remove flywheel cover. 3954 29192 Electric start models Manual start models WARNING The neutral‑speed‑protection device is inoperative when starting the engine with the emergency starter rope. Set the engine speed at idle and the gear shift in neutral to prevent the outboard from starting in gear. 2.
- Page 55 OPERATION 4. Set the lanyard stop switch to the "RUN" position. Refer to General Information ‑ Lanyard Stop Switch. 19791 WARNING High voltage is present any time the key is turned on, especially when starting or operating the engine. Do not touch ignition components or metal test probes and stay clear of spark plug leads when performing live tests.
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Page 56: Setting Trim Angle While Running Engine At Idle Speed
OPERATION 6. If engine is cold, hold the fuel primer button in and pump up the fuel pressure with the fuel primer bulb. 29544 7. Pull the starter rope to start the engine. Setting Trim Angle While Running Engine at Idle Speed The exhaust relief hole on the outboard may become submerged if the outboard is trimmed full‑in while running at idle speed. -
Page 57: Cleaning Care Recommendations
Record maintenance performed in the Maintenance Log at the back of this book. Save all maintenance work orders and receipts. Selecting Replacement Parts For Your Outboard We recommend using original Mercury Precision or Quicksilver replacement parts and Genuine Lubricants. DO NOT USE CAUSTIC CLEANING CHEMICALS IMPORTANT: Do not use caustic cleaning chemicals on the outboard power package. - Page 58 Keep water spray out of the air filter/intake and alternator. After washing, allow the powerhead and components to dry. Apply Quicksilver or Mercury Precision Lubricants Corrosion Guard spray on the external metal surfaces of the powerhead and powerhead components. Do not allow the Corrosion Guard spray to come in contact with the alternator drive belt or belt pulleys.
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Page 59: Inspection And Maintenance Schedule
MAINTENANCE Tube Ref Description Where Used Part No. External metal surfaces of the powerhead Corrosion Guard 92-802878 55 and powerhead components. Inspection and Maintenance Schedule DAILY CHECKS • Check the engine oil level • Check the lanyard stop switch • Inspect the fuel system for leaks •... -
Page 60: Flushing The Cooling System
Flush the internal water passages of the outboard with fresh water after each use in salt, polluted, or muddy water. This will help prevent a buildup of deposits from clogging the internal water passages. Use a Mercury Precision or Quicksilver accessory (or equivalent) flushing attachment. WARNING Rotating propellers can cause serious injury or death. -
Page 61: Flushing The Cooling System - Models With Accessory Hose Flush Attachment
MAINTENANCE IMPORTANT: Do not run engine above idle when flushing. 4. Adjust water flow (if necessary) so excess water continues leaking out from around the rubber cups to ensure the engine is receiving an adequate supply of cooling water. 27260 5. -
Page 62: Top Cowl Removal And Installation
MAINTENANCE NOTE: Engine can be stopped or running at idle speed in neutral when flushing the cooling system. Do not flush engine using a water source that exceeds 6.5 kPa (45 psi). 3. Turn on the water and flush the cooling system for a minimum of 3 minutes. -
Page 63: Battery Inspection
MAINTENANCE Battery Inspection The battery should be inspected at periodic intervals to ensure proper engine starting capability. IMPORTANT: Read the safety and maintenance instructions which accompany your battery. 1. Turn off the engine before servicing the battery. 2. Ensure the battery is secure against movement. 3. - Page 64 MAINTENANCE IMPORTANT: Visually inspect for fuel leakage from the filter connections by squeezing the primer bulb until firm, forcing fuel into the filter. 2896 FUEL LINE FILTER - NON OIL INJECTED MODELS Inspect the sight bowl for water accumulation. The sight bowl is equipped with a float that floats on water.
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Page 65: Steering Link Rod Fasteners
MAINTENANCE Installation 1. Reinstall filter element (open end up). 2. Place O‑ring seal onto the sight bowl and reinstall sight bowl with cap. 3. Tighten cap securely. IMPORTANT: Visually inspect for fuel leakage from the filter by squeezing the primer bulb until firm, forcing fuel into the filter. Steering Link Rod Fasteners IMPORTANT: The steering link rod that connects the steering cable to the engine must be fastened using special washer head bolt ("a"... -
Page 66: Fuse Replacement
MAINTENANCE Description lb‑in. lb‑ft Tighten until seats, then back off 1/4 Nylon insert locknut "c" turn Assemble steering link rod to steering cable with two flat washers and nylon insert locknut. Tighten locknut until it seats, then back nut off 1/4 turn. Assemble steering link rod to engine with special washer head bolt and locknut. -
Page 67: Propeller Replacement
MAINTENANCE The gearcase has two corrosion control anodes, one on each side. A third anode is installed on the bottom of the transom bracket assembly. Anode (2) on each side of gearcase Anode on transom bracket assembly 27844 Propeller Replacement WARNING Rotating propellers can cause serious injury or death. - Page 68 5. Pull propeller straight off shaft. If propeller is seized to the shaft and cannot be removed, have the propeller removed by an authorized dealer. 6. Coat the propeller shaft with Quicksilver or Mercury Extreme Grease or 2‑4‑C with PTFE.
- Page 69 MAINTENANCE IMPORTANT: To prevent the propeller hub from corroding and seizing to the propeller shaft (especially in saltwater), always apply a coat of the recommended lubricant to the entire propeller shaft at the recommended maintenance intervals and also each time the propeller is removed. 7.
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Page 70: Spark Plug Inspection And Replacement
MAINTENANCE Spark Plug Inspection and Replacement WARNING Damaged spark plug boots may emit sparks that can ignite fuel vapors under the engine cowl, resulting in serious injury or death from a fire or explosion. To avoid damaging the spark plug boots, do not use any sharp object or metal tool to remove the spark plug boots. -
Page 71: Lubrication Points
MAINTENANCE Lubrication Points 1. Lubricate the following with Quicksilver or Mercury Extreme Grease or 2‑4‑C with PTFE. Tube Ref Description Where Used Part No. Extreme Grease Propeller shaft 8M0071842 2-4-C with PTFE Propeller shaft 92-802859A 1 • Propeller Shaft ‑ Refer to Propeller Replacement for removal and installation of the propeller. - Page 72 MAINTENANCE • Tilt Tube ‑ Lubricate through fitting. 29478 • Tiller Handle ‑ Lubricate through fitting. 29576 • Steering Cable Grease Fitting (If equipped) ‑ Rotate steering wheel to fully retract the steering cable end into the outboard tilt tube. Lubricate through fitting.
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Page 73: Checking Power Trim Fluid
27877 2. Remove fill cap and check fluid level. The fluid level should be even with the bottom of the fill hole. Add Quicksilver or Mercury Precision Lubricants Power Trim & Steering Fluid. If not available, use automotive (ATF) automatic transmission fluid. - Page 74 GEARCASE LUBRICANT CAPACITY Gearcase lubricant capacity is approximately 665 ml (22.5 fl oz). GEARCASE LUBRICANT RECOMMENDATION Mercury or Quicksilver Premium or High Performance Gear Lubricant. CHECKING LUBRICANT LEVEL AND FILLING GEARCASE 1. Place the outboard in a vertical operating position.
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Page 75: Submerged Outboard
MAINTENANCE 5. Stop adding the lubricant. Install the rear vent plug and sealing washer before removing lubricant tube. 6. Remove the lubricant tube and install cleaned fill/drain plug and sealing washer. Submerged Outboard A submerged outboard will require service within a few hours by an authorized dealer once the outboard is recovered from the water. -
Page 76: Storage
STORAGE Storage Preparation The major consideration in preparing your outboard for storage is to protect it from rust, corrosion, and damage caused by freezing of trapped water. The following storage procedures should be followed to prepare your outboard for out of season storage or prolonged storage (two months or longer). NOTICE Without sufficient cooling water, the engine, the water pump, and other components will overheat and suffer damage. -
Page 77: Protecting Internal Engine Components
STORAGE • Touch up any paint nicks. See your dealer for touch‑up paint. • Spray Quicksilver or Mercury Precision Lubricants Corrosion Guard on external metal surfaces (except corrosion control anodes). Tube Ref Description Where Used Part No. Corrosion Guard External metal surfaces... - Page 78 STORAGE • Remove the battery from the boat and check water level. Charge if necessary. • Store the battery in a cool, dry place. • Periodically check the water level and charge the battery during storage.
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Page 79: Troubleshooting
TROUBLESHOOTING Starter Motor Will Not Crank the Engine POSSIBLE CAUSES • Blown 20‑amp fuse in the starting circuit. Refer to Maintenance. • Outboard is not shifted to neutral position. • Weak battery or battery connections are loose or corroded. • Ignition key switch failure. -
Page 80: Performance Loss
TROUBLESHOOTING • Ignition system component failure. Performance Loss POSSIBLE CAUSES • Throttle not fully open. • Damaged or improper size propeller. • Incorrect engine timing, adjustments, or setup. • Boat overloaded or load improperly distributed. • Excessive water in bilge. •... -
Page 81: Owner Service Assistance
STOLEN POWER PACKAGE 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 the recovery of stolen power packages. - Page 82 OWNER SERVICE ASSISTANCE RESOLVING A PROBLEM Satisfaction with your Mercury product is important to your dealer and to us. If you ever have a problem, question or concern about your power package, contact your dealer or any authorized Mercury dealership. If you need additional assistance: 1.
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Page 83: Ordering Literature
Before ordering literature, have the following information about your power package available: Model Serial Number Horsepower Year UNITED STATES AND CANADA For additional literature for your Mercury Marine power package, contact your nearest Mercury Marine dealer or contact: Mercury Marine Telephone Mail Mercury Marine (920) 929‑5110 (920) 929‑4894... - Page 84 OWNER SERVICE ASSISTANCE Mercury Marine Submit the following Attn: Publications Department order form with payment W6250 Pioneer Road P.O. Box 1939 Fond du Lac, WI 54936-1939 Ship To: (Copy this form and print or type–This is your shipping label) Name...
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Page 85: Engine Installation
51965 Accessories Mounted to the Transom Clamp Bracket Mercury Marine has been made aware that certain aftermarket marine accessories, such as emergency boarding ladders, shallow water anchors, transom wedge kits, and tow sport attaching devices, have been mounted to the boat by use of the same fasteners that secure the outboard to the transom or jack plate. - Page 86 ENGINE INSTALLATION WARNING Avoid serious injury or death resulting from a loss of boat control. Loose engine fasteners could cause the transom bracket to fail, resulting in a loss of the driver's ability to control the boat. Always ensure that the engine fasteners are tightened to the specified torque.
- Page 87 ENGINE INSTALLATION • The installation must not create interference issues, as would an accessory mounting plate resting in the radius of the transom clamp bracket. Refer to Figure 1. 54624 Figure 1 Minimum clearance 3.175 mm (0.125 in.) Edge of accessory bracket Transom clamp bracket wall Radius Engine supplied mounting fasteners...
- Page 88 ENGINE INSTALLATION UNACCEPTABLE ACCESSORY MOUNTING IMPORTANT: Do not use the fasteners that secure the engine to the boat (either the transom or the jack plate) for any purpose other than securing the engine to the boat. 1. Do not mount an accessory to the transom clamp bracket in an unsupported condition.
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Page 89: Fastening The Outboard To The Transom
ENGINE INSTALLATION 3. Do not install wedges or plates between the transom clamp brackets and the transom (or jack plate). Refer to Figure 4. Figure 4 Boat transom or jack plate Transom clamp bracket Wedge/plate 54058 Fastening the Outboard to the Transom MOUNTING BOLTS Outboard Transom Mounting Hardware ‑... - Page 90 ENGINE INSTALLATION CHECKING BOAT TRANSOM CONSTRUCTION IMPORTANT: Determine the strength of the boat transom. The outboard mounting locknuts and bolts should be able to hold 75 Nm (55 lb‑ft) of torque without the boat transom yielding or cracking. If the boat transom yields or cracks under this torque, the construction of the transom may not be adequate.
- Page 91 ENGINE INSTALLATION FASTENING THE OUTBOARD TO THE TRANSOM IMPORTANT: The transom mounting surface must be flat within 3.17 mm (0.125 in.). No step in the transom mounting surface is allowed. The inside transom mounting bolt washer surface must be flat within 3.17 mm (0.125 in.). 51817 Step (not allowed) Gap between transom clamp and boat transom (not allowed)
- Page 92 Failure to maintain clearance may damage the transom bracket and cause the transom bracket to fail. Adjustments to the position of the Mercury Marine transom drilling fixture may be required to ensure proper clearance of the transom bracket relief radius area.
- Page 93 ENGINE INSTALLATION NOTE: For a more accurate torque reading, tighten the mounting locknuts rather than the outboard mounting bolts. 40952 0.500 in. diameter outboard mounting bolt (4) 0.875 in. flat washer (4) Nylon insert locknut (4) 1.500 in. flat washer (4) Marine sealer –...
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Page 94: Installing Outboard
ENGINE INSTALLATION A decal on the transom bracket reminds the owner to check the fasteners securing the outboard to the transom before each use. 51985 Decal on the transom bracket Installing Outboard WARNING Failure to correctly fasten the outboard could result in the outboard propelling off the boat transom resulting in property damage, serious injury, or death. -
Page 95: Maximum Outboard Mounting Height
ENGINE INSTALLATION The outboard must be secured to the transom with the four 12.7 mm (1/2 in.) diameter mounting bolts and locknuts provided. Install two bolts through the upper set of holes and two bolts through the lower set of holes. 26789 Maximum Outboard Mounting Height The mounting height of the outboard must not exceed 635 mm (25 in.) for EL... -
Page 96: Maintenance Log
MAINTENANCE LOG Maintenance Log Record all maintenance performed on your outboard here. Be sure to save all work orders and receipts. Date Maintenance Performed Engine Hours...
Need help?
Do you have a question about the 75 TwoStroke and is the answer not in the manual?
Questions and answers
How do you set the rate of 2 stroke oil that is added to fuel on the Mariner 90 Hp, 2005
For a Mercury 75 TwoStroke, the 2-stroke oil ratio for fuel is set based on the specified mix ratios:
- 25:1 (4%) requires 148 ml (5 fl oz) of oil per 6 gallons (23 liters) of gas.
- 50:1 (2%) requires 89 ml (3 fl oz) of oil per 6 gallons (23 liters) of gas.
Mix the appropriate amount of oil with gasoline before use, ensuring proper blending for engine performance.
This answer is automatically generated
@Mr. Anderson
@Mr. Anderson , the conversion seems to be much more aggressive than i thought. would it not be 89 ml (3 fl oz) for 1 ONE gallon (3.75 lt) of gas?
High pitch noise in 75hp 2stroke
The context does not provide information about the cause of a high pitch noise in a Mercury 75 TwoStroke engine.
This answer is automatically generated
What size fuel line for Mercury 90hp outboard, 3/8 or 5/16”?
What is the part no for oil filter on a 75. between tank and injectors