TOHATSU M 6B Owner's Manual
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TOHATSU M 6B Owner's Manual

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  • Page 3 OWNER’S MANUAL M 6B M 8B M 9.8B OB No.003-11029-EAF1...
  • Page 4 INJURY OR DEATH. KEEP THIS MANUAL IN A SAFE LOCATION FOR FUTURE REFERENCE. Copyright © 2016 Tohatsu Corporation. All rights reserved. No part of this manual may be reproduced or transmitted in any from or by any means without the express written permission of Tohatsu Corporation.
  • Page 5 ENOM00006-A To You, Our Customer Thank you for selecting a TOHATSU outboard motor. You are now the proud owner of an excellent outboard motor that will service you for many years to come. This manual should be read in its entirety and the inspection and maintenance procedures described later in this manual should be followed carefully.

  • Page 6: Serial Number

    ENOM00005-A Serial Number In the space below, please record the outboard motor's serial number (indicated both on the bottom cowl and on the cylinder block). The serial number will be needed when order- ing parts, and when making technical or warranty inquiries. Serial Number: ENOF02200-0 ENOF02201-0...
  • Page 7 ENOM00007-0 NOTICE: DANGER/WARNING/CAUTION/Note Before installing, operating or otherwise handling your outboard motor, be sure to thor- oughly read and understand this Owner's Manual and carefully follow all of the instruc- tions. Of particular importance is information preceded by the words “DANGER,” “WARNING,”...

  • Page 9: Table Of Contents

    CONTENTS 1. GENERAL SAFETY INFORMATION ....... 10 2. SPECIFICATIONS ..........12 3.
  • Page 10 11. TROUBLESHOOTING ......... . 63 12.
  • Page 11 INDEX 1 GENERAL SAFETY INFORMATION 2. SPECIFICATIONS 3. PARTS NAME 4. LABEL LOCATIONS 5. INSTALLATION 6. PRE-OPERATING PREPARATIONS 7. ENGINE OPERATION 8. REMOVING AND CARRYING THE OUTBOARD MOTOR 9. ADJUSTMENT 10. INSPECTION AND MAINTENANCE 11. TROUBLESHOOTING 12. TOOL KIT AND SPARE PARTS 13.

  • Page 12: General Safety Information

    GENERAL SAFETY INFORMATION ENOM00009-0 SAFE OPERATION OF BOAT As the operator/driver of the boat, you are responsible for the safety of those aboard and those in other boat around yours, and for following local boating regulations. You should be thoroughly knowledgeable on how to correctly operate the boat, outboard motor, and accessories.
  • Page 13 GENERAL SAFETY INFORMATION ENOM00010-0 SERVICING, REPLACEMENT PARTS & LUBRICANTS We recommend that only an authorized service shop perform service or maintenance on this outboard motor. Be sure to use genuine parts, genuine lubricants, or recommended lubricants. ENOM00011-A MAINTENANCE As the owner of this outboard motor, you should be acquainted with correct maintenance procedures following maintenance section of this manual (See page 46).

  • Page 14: Specifications

    SPECIFICATIONS ENOM00810-B MODEL FEATURE Model M9.8B Type Transom heights Tiller Handle Remote Control ( )*1 ( )*1 ( )*1 ( )*1 Mnual tilt *1 Option ENOM00811-C MODEL NAME EXAMPLE M9.8B EFL Horse Product Starter Steering Model description Shaft length power generation system system...
  • Page 15 Genuine Gear Oil or API GL5, SAE #80 to #90, approx. 320 (10.8) Gear Reduction Ratio 2.08 (13 : 27) Remark : Specifications subject to change without notice. * : with manual Tohatsu outboard is power rated in accordance with ISO8665 (propeller shaft output).

  • Page 16: Parts Name

    PARTS NAME ENOM01501-0 6B MF, 8B MF, 9.8B MF ENOF02203-0 Tilt Handle Starter Handle Choke Knob Top Cowl Shift Lever Fuel Connector Bottom Cowl Throttle Grip Spark Plug Cooling Water Check Port Clamp Screw Fuel Filter Tilt Stopper Clamp Bracket Drive Shaft Housing Thrust Rod Water Plug...
  • Page 17 PARTS NAME ENOM01502-0 9.8B EF ENOF02204-0 Tilt Handle Starter Handle Stop Switch Top Cowl Shift Lever Main Switch Bottom Cowl Throttle Grip Fuel Connector Cooling Water Check Port Clamp Screw Battery Cord Tilt Stopper Clamp Bracket Spark Plug Drive Shaft Housing Thrust Rod Fuel Filter Water Plug...
  • Page 18 PARTS NAME ENOM00822-0 Remote control box & Fuel tank ENOF02103-0 Control Lever Fuel gauge Neutral lock arm Air vent screw Free throttle lever Fuel tank cap Main switch Fuel connector (Engine side) Stop switch Primer bulb Stop switch lock Fuel connector (Fuel tank side) Stop switch lanyard...

  • Page 19: Label Locations

    LABEL LOCATIONS ENOM00019-A Warning label locations ENOF02206-0...
  • Page 20 LABEL LOCATIONS Warning label regarding owner’s man- Warning regarding gasoline (See ual, top cowl and engine stop switch. page 24). ENOF00005-S Warning regarding gasoline (See ENOF00005-W page 24). Warning regarding rotating object. ENOF00005-L ENOF00005-X Warning regarding high voltage. 3C8-72181-0B Warning label regarding engine stop switch.
  • Page 21 LABEL LOCATIONS ENOM01001-0 Serial number label locations r o t l a i ENOF02207-0 1. Model code(Model name) 2. Rated power 3. Dry mass weight 4. Serial No. 5. Manufacture name 6. Manufacture address...

  • Page 22: Installation

    INSTALLATION ENOM00024-B Keep the outboard motor in a vertical posi- 1. Mounting the outboard motor on tion when mounting. boat ENOW00006-0 WARNING Most boats are rated and certified in terms of their maximum allowable horsepower, as shown on the boat’s certification plate. Do not equip your boat with an outboard motor that exceeds this limit.
  • Page 23 INSTALLATION ENOM00830-A Mounting bolts Manual tilt type 1. To attach the outboard motor to the boat, tighten the clamp screws by 30−50 mm turning their handles. (1.2−2 in) Also, use the bolts to secure the out- board motor brackets on transom ENOF01706-0 board.

  • Page 24: Remote Control Device Installation

    INSTALLATION ENOM00840-0 2. Remote control device installation (Option) ENOW00850-0 Remote control box location ENOF00842-0 Measure the distance from the remote control box to the outboard motor where 1, 2 the remote control cable should be routed. Prepare a cable that is 300-450mm (11.8- 17.7in) longer than the measured distance.
  • Page 25 INSTALLATION contact with your eye, loss of sight. Use ENOW00015-0 safety glasses and rubber gloves. CAUTION In case battery electrolyte comes in con- tact with: Do not use a battery that is not recom- Skin, flush thoroughly with water. mended. Use of a battery not recom- Eye, flush thoroughly with water, and mended can lead to poor performance of, then seek immediate medical treatment.

  • Page 26: Pre-Operating Preparations

    The fuel system components on your gasoline in the fuel tank for long periods TOHATSU engine will withstand up to 10% should be avoided. Long periods of stor- ethyl alcohol (hererinafter referred to as the age, common to boats, create unique prob- lems.

  • Page 27: Fuel Filling

    PRE-OPERATING PREPARATIONS age if alcohol has washed protective oil When or before refueling: films from internal components. Be sure to remove the static electricity charged in your body before refueling. The sparks due to static electricity may ENOW00018-0 cause explosion of flammable gasoline. WARNING Stop the engine, and do not start the engine during refueling.

  • Page 28: Engine Oil Recommendation

    PRE-OPERATING PREPARATIONS Use a genuine engine oil or recommended one (TCW3). Refer to your Distributor. Will not recommend use of other two stroke engine oil. Add engine oil into fuel oil tank. The mixing ratio with gasoline is 50 : 1 (50 parts gaso- line and one part oil).
  • Page 29 PRE-OPERATING PREPARATIONS For quantities of engine oil and gasoline to Pour engine oil into fuel container, and then, gasoline. be pre-mixed, refer to table in previous page. Put cap on the container, and close tightly. When portable fuel tank is used for Shake the container to mix engine oil operation of outboard motor(s): and gasoline well and even.

  • Page 30: Break-In

    PRE-OPERATING PREPARATIONS ]ENOM00033-A 4. Break-In Your new outboard motor and lower unit ENOW00023-0 require break-in for the moving compo- CAUTION n e n t s a c c o r d i n g t o t h e c o n d i t i o n s Operating the outboard motor without described in the following time table.

  • Page 31: Engine Operation

    ENGINE OPERATION ENOM00042-0 tank is raised by heat from sources such as sun light. Before starting 1. Full open the air vent screw on the fuel ENOW00022-B tank cap. CAUTION Be sure to fill the engine before starting engine. (To properly fill the engine with oil follow the instructions.

  • Page 32: Starting The Engine

    ENGINE OPERATION ENOF00861-A 1. Pull ENOF00863-0 2. Insert 1. Test tank 4. Squeeze primer bulb until it becomes 2. Water 3. Over 10 cm (4 in.) stiff to feed fuel to carburetor. Direct arrow mark upward when priming. ENOW00036-0 CAUTION Be sure to stop engine immediately if cool- ing water check port is not discharging water, and check if cooling water intake is...
  • Page 33 ENGINE OPERATION ENOM01005-A 3. Set the throttle grip to START position. Tiller handle type 1. Be sure to install the stop switch lock to the stop switch, and attach the stop switch lanyard securely to the operator or to the operator's PFD (Personal Flo- tation Device.) ENOF02214-0 1.

  • Page 34: Emergency Starting

    ENGINE OPERATION (For manual starter type) If cranking over 5 seconds fails to start engine, return main switch to “ON”, and 5. Pull the starter handle slowly until you crank engine again after 10 seconds or feel engagement, keep pulling till you more.
  • Page 35 ENGINE OPERATION Do not pull starter rope if any bystander 4. Insert the knotted end of the starter is behind. The action can injure the rope into the notch in the flywheel and bystander. wind the rope around the flywheel sev- Attach engine stop switch lanyard to eral turns clockwise.

  • Page 36: Warming Up The Engine

    ENGINE OPERATION 8. Pull the starter handle slowly until you feel engagement, keep pulling till you feel less resistance. Then pull it quickly. ENOF02218-0 1. Cooling water check port 2. Idle port ENOF02223-0 ENOM00044-A After engine starts, do not reinstall fly- Engine speeds wheel cover and top cowl.
  • Page 37 ENGINE OPERATION Be careful not to pull the tether acciden- stop engine, shift to neutral, and restart tally during cruising. Unintentional stop engine to warm up. of engine can cause loss of control of outboard motor. Rapid loss of engine ENON00014-0 Note power can lead to falling down or caus-...

  • Page 38: Stopping The Engine

    ENGINE OPERATION 2. When the engine reaches trolling (or ENOM00049-A 5. Stopping the engine idling) speed, quickly pull the shift lever to the Reverse position. ENOW00868-0 WARNING Be careful not to remove engine stop switch lanyard from engine accidentally while boat is running. Sudden stop of engine can cause loss of steering control.

  • Page 39: Steering

    ENGINE OPERATION 3. Push the stop switch for a few sec- ENOM00920-0 6. Steering onds to stop the engine. ENOW00870-0 WARNING Sudden steering may cause passenger(s) to be thrown overboard or falling down. Tiller handle type Right turn Move the tiller handle to the left Left turn ENOF02227-A Move the tiller handle to the right.
  • Page 40 ENGINE OPERATION ENOW00044-0 WARNING Excessive trim up or down may lead to unstable boat operation, potentially caus- ing the steering difficulty that leads to acci- dent during cruising. Do not cruise at high speed if improper trim position is suspected. Stop the boat ENOF00052-0 and readjust trim angle before continu- ing cruise.

  • Page 41: Tilt Up And Down

    ENGINE OPERATION Trim angle adjustment (Manual tilt Be sure to tilt the outboard motor down type) slowly. The transom angle adjustment ENOW00056-A 1. Stop the engine. WARNING 2. Shift into neutral. 3. Raise the outboard motor to the tilt up When tilting up outboard motor with fuel position.

  • Page 42: Shallow Water Operation

    ENGINE OPERATION ENOW00053-0 CAUTION While in shallow water drive position, do not operate the outboard motor in Reverse. Operate the outboard motor at slow speed and keep the cooling water intake sub- merged. ENOW00054-A CAUTION ENOF00544 A 1. Tilt lever Do not overtilt outboard motor when driv- 2.
  • Page 43 ENGINE OPERATION Return to normal running position: 2. Tilt the motor up fully and then return the motor down slowly to the normal running position. ENOF00549-A 1. Tilt lever 2. Shallow water running position...

  • Page 44: Removing And Carrying The Outboard Motor

    REMOVING AND CARRYING THE OUTBOARD MOTOR ENOM00070-B Fuel leakage is a fire or explosion hazard, which can cause serious injury or death. 1. Removing the outboard motor ENOW00065-0 ENOW00064-0 WARNING CAUTION Close air vent screw of fuel tank before Engine may be hot immediately after oper- carrying or storing outboard motor and fuel ating and could cause burns if touched.

  • Page 45: Traillering

    REMOVING AND CARRYING THE OUTBOARD MOTOR ENOW00073-A WARNING Be sure to disconnect fuel connector except when operating engine. Fuel leakage is a fire or explosion hazard, which can cause serious injury or death. ENOF00075-1 ENOW00068-0 ENOF02232-0 WARNING ENON00021-A Note Close air vent screw of fuel tank and fuel If the outboard motor must be laid down cock before carrying or storing outboard be sure drain the fuel and engine oil,...

  • Page 46: Adjustment

    ADJUSTMENT ENOM00073-B be made with the throttle adjustment 1. Steering friction screw. ENOW00074-A WARNING Do not overtighten the steering friction lever it could result in difficulty of move- ment resulting in the loss of control caus- ing an accident and could lead to severe injury.
  • Page 47 ADJUSTMENT readjusting trim tab, check if steering fic- tion is even. I f s t r a i g h t - l i n e c r u i s i n g c a n n o t b e achieved, adjust the trim tab located under the anti-ventilation plate.

  • Page 48: Inspection And Maintenance

    INSPECTION AND MAINTENANCE ENOM00077-0 Care of your outboard motor To keep your outboard motor in the best operating condition, it is very important that you perform daily and periodic main- tenance as suggested in the maintenance schedules that follow. ENOW00077-0 CAUTION Your personal safety and that of your passengers depends on how well you...

  • Page 49: Daily Inspection

    INSPECTION AND MAINTENANCE ENOM01203-0 1. Daily Inspection Perform the following checks before and ENOW00078-0 after use. WARNING Do not use outboard motor if any abnor- mality is found during pre-operation check or it could result in severe damage to the motor or severe personal injury.
  • Page 50 INSPECTION AND MAINTENANCE ENOM00083-0 ment as this can cause damage to the out- Washing outboard motor board motor. ENOW00081-0 ENOW00922-0 WARNING CAUTION Do not start engine without removing pro- To prevent the engine from starting when peller, or accidentally turning propeller you are near the propeller, remove the stop could cause personal injury.
  • Page 51 10 cm (4 in.) above the anti ventilation If the fuse continues to blow, request an plate. authorized Tohatsu dealer to inspect the And be sure to remove the propeller, when outboard motor. starting the engine in the test tank. (See 1.
  • Page 52 INSPECTION AND MAINTENANCE 4. Remove the fuse and check it. If the fuse is blown, replace it with a fuse of the same specified rating. ENOF02205-0 1. Blown fuse...

  • Page 53: Periodic Inspection

    INSPECTION AND MAINTENANCE ENOM01503-0 2. Periodic Inspection It is important to inspect and maintain your outboard motor regularly. At each interval on the chart below, be sure to perform the indicated servicing. Maintenance intervals should be determined according to the number of hours or number of months, whichever comes first.
  • Page 54 INSPECTION AND MAINTENANCE ENOM00093-A Fuel filters and fuel tank cleaning ENOW00093-B WARNING Gasoline and its vapors are very flammable and can be explosive. Keep out of reach of children. Avoid repeated or prolonged contact with skin or breathing of vapor. ENOF02236-0 Do not start this procedure while engine 1.
  • Page 55 INSPECTION AND MAINTENANCE ENOM00098-A 3. Insert the oil tube nozzle into the lower Gear oil replacement oil plug hole, and fill with gear oil by ENOW00094-0 squeezing the oil tube until oil flows out WARNING of the upper plug hole and bubbles is disappeared to remove the air.

  • Page 56: Propeller Replacement

    INSPECTION AND MAINTENANCE ing to serious personal injury. Discon- nect battery cable if possible. The propeller edge is thin and sharp. Wear the groves during replacement to protect your hands. ENOW00086-0 CAUTION Do not install propeller without thrust holder, or propeller boss could be dam- aged.
  • Page 57 INSPECTION AND MAINTENANCE 5. Install the thrust holder, propeller, Do not touch spark plugs immediately after stopping engine as they will be hot stopper, washer and propeller nut onto a n d c o u l d c a u s e s e v e r e b u r n s i f the shaft.
  • Page 58 INSPECTION AND MAINTENANCE ENOF00085-0 1. Electrode 2. Spark gap (0.9–1.0 mm, 0.035–0.039 in) 7. Install the spark plug by hand and turn it carefully to avoid cross-threading. 8. Tighten the spark plug to the specified torque. ENON00028-0 Note Spark plug torque: 25.0 Nm (18 ft-lb) [2.5 kgf-m] If a torque-wrench is not available when you are fitting a spark plug, a good estimate of...

  • Page 59: Anode Replacement

    INSPECTION AND MAINTENANCE ENOM00088-A Anode replacement A sacrificial anode protects the outboard motor from electrolytic corrosion. Anode is located on the gear case, cylinder etc.. When the anode is eroded more than 1/3 of origi- nal size, replace it. ENON00029-0 Notes Never grease or paint the anode.
  • Page 60 INSPECTION AND MAINTENANCE ENOM00960-0 Grease point Apply water proof grease to the parts shown below. ENOF02239-0...

  • Page 61: Off-Season Storage

    INSPECTION AND MAINTENANCE ENOM00100-A 3. Drain all fuel from the fuel hoses, fuel 3. Off-season storage pump, fuel filter (See page 52) and car- buretor (See page 60), and clean these ENOW00934-0 parts. WARNING Keep in mind that if gasoline is kept in the carburetor for a long time, gum Be sure to disconnect fuel connector and varnish will develop, causing the...

  • Page 62: Adding A Fuel Stabilizer

    INSPECTION AND MAINTENANCE ENOW00066-0 1. Before adding fuel stabilizer additive, drain the carburetor (See page 60). CAUTION 2. Follow the instructions on the label Do not carry or store outboard motor in any when adding the fuel stabilizer additive. of positions described below. 3.

  • Page 63: Pre-Season Check

    INSPECTION AND MAINTENANCE 1. Disconnect the fuel hose from the out- Specific Gravity Terminal Voltage Charge Condition board motor. at 20° 2. Remove the top cowl. 1.120 10.5 Fully discharged 1.160 11.1 1/4 charged 3. Place an appropriate rag under the 1.210 11.7 1/2 charged...

  • Page 64: Cold Weather Precautions

    INSPECTION AND MAINTENANCE After taking your outboard motor out of the 1. Stop the engine immediately. water, immediately take it to your dealer. 2. Check the control system, gear case, The following are the emergency mea- boat transom etc. sures to be taken for a submerged out- 3.

  • Page 65: Troubleshooting

    TROUBLESHOOTING ENOM01505-0 If you encounter a problem, consult the check list below to determine the cause and to take the proper action. An authorized dealer will always be happy to provide any assistance and information. Possible cause Empty fuel tank Incorrect connection of fuel system Air entering fuel line Deformed or damaged fuel pipe...
  • Page 66 TROUBLESHOOTING Possible cause Incorrect adjustment of throttle link Insufficient cooling water flow, clogged or defective pump Faulty thermostat Cavitation or ventilation Incorrect propeller selection Damaged and bent propeller Improper thrust rod position Unbalanced load on boat Transom too high or too low...

  • Page 67: Tool Kit And Spare Parts

    TOOL KIT AND SPARE PARTS ENOM01506-0 The following a list of the tools and spare parts provided with the motor. Items Quantity Remark Tool Bag Pliers Socket Wrench 10 x 13 mm Servicing Tools Socket Wrench 21 mm Socket Wrench Handle Screwdriver(Phillips-type and flat head) Adapter-type Rope...

  • Page 68: Propeller Table

    PROPELLER TABLE ENOM00111-0 Use a genuine propeller. A propeller must be selected so that the engine rpm measured at wide open throttle while cruising is within the recommended range. Recommended range at WOT: 6B, 8B = 4,500 to 5,500 rpm 9.8B = 5,000 to 6,000 rpm Propeller Size (Diameter ×...
  • Page 70 OWNER’S MANUAL M 6B M 8B M 9.8B 003-11029-EAF1 1512NB Printed in Japan...

This manual is also suitable for:

M8bM9.8b

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