TROUBLE RECOVERY. Yamaha 50A, 40A

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Chapter 5

TROUBLE RECOVERY

1

TROUBLESHOOTING ..............................5-1 2

TEMPORARY ACTION IN

EMERGENCY ............................................5-5

Impact damage.....................................5-5

Power trim/tilt will not operate ...........5-5

Starter will not operate ........................5-6

Engine fails to operate .........................5-8

Treatment of submerged motor .......5-10

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TROUBLESHOOTING

A problem in the fuel, compression, or ignition systems can cause poor starting, loss of power, or other problems. The troubleshooting chart describes basic checks and possible remedies. (This chart covers all Yamaha outboard motors. Therefore, some items may not apply to your model.)

If your outboard motor requires repair, bring it to a Yamaha dealer.

Trouble

A. Starter will not operate.

B. Engine will not start (Starter operates).

Possible Cause

1. Battery capacity weak or low.

2. Battery connections loose or corroded.

3. Fuse for electric start circuit blown.

4. Starter components faulty.

5. Engine stop switch lanyard not attached.

6. Shift lever in gear.

1. Fuel tank empty.

2. Fuel contaminated or stale.

3. Fuel filter clogged.

4. Starting procedure incorrect.

5. Fuel pump malfunctions.

6. Spark plug(s) fouled or incorrect type.

7. Spark plug cap(s) fitted incorrectly.

8. Poor connections or damaged ignition wiring.

9. Ignition parts faulty.

10. Engine stop switch lanyard not attached.

11. Shift lever in gear.

12. Engine inner parts damaged.

Remedy

1. Check battery condition. Use battery of recommended capacity.

2. Tighten battery cables and clean battery terminals.

3. Check for cause of electric overload and repair. Replace fuse with one of correct amperage.

4. Have serviced by a Yamaha dealer.

5. Attach lanyard.

6. Shift to neutral.

1. Fill tank with clean, fresh fuel.


3. Clean or replace filter.

4. Read "STARTING ENGINE" section.


6. Inspect spark plug(s). Clean or replace with recommended type.

7. Check and re-fit cap(s).

8. Check wires for wear or breaks.

Tighten all loose connections.

Replace worn or broken wires.


10. Attach lanyard.

11. Shift to neutral.


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Trouble Possible Cause


2. Fuel system obstructed.



5. Failed ignition parts.

6. Warning system activated.

7. Spark plug gap incorrect.


C. Engine idles irregularly or stalls.

9. Specified engine oil not used.

10. Thermostat faulty or clogged.

11. Carburetor adjustments incorrect.

12. Fuel pump damaged.

13. Air vent screw on the fuel tank closed.

14. Choke knob pulled out.

15. Motor angle too high.

16. Carburetor clogged.

17. Fuel joint connection incorrect.

18. Throttle valve adjustment incorrect.

19. Battery lead disconnected.

Remedy


2. Check for pinched or kinked fuel line or other obstructions in fuel system.




6. Find and correct cause of warning.

7. Inspect and adjust as specified.




9. Check and replace oil as specified.




13. Open the air vent screw.

14. Return to home position.

15. Return to normal operating position.


17. Connect correctly.


19. Connect securely.

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Trouble

D. Warning buzzer sounds or indicator lamp lights.

E. Engine power loss.

Possible Cause

1. Cooling system clogged.

2. Engine oil level low.

3. Heat range of spark plug incorrect.


5. Engine oil contaminated or deteriorated.

6. Oil filter clogged.

7. Oil feed/injection pump malfunctions.

8. Load on boat improperly distributed.

9. Water pump/thermostat faulty.

1. Propeller damaged.

2. Propeller pitch or diameter incorrect.

3. Trim angle incorrect.

4. Motor mounted at incorrect height on transom.

5. Warning system activated.

6. Boat bottom fouled with marine growth.


8. Weeds or other foreign matter tangled on gear housing.

9. Fuel system obstructed.



12. Spark plug gap incorrect.

Remedy

1. Check water intake for restriction.

2. Fill oil tank with specified engine oil.

3. Inspect spark plug and replace it with recommended type.

4. Check and replace oil with specified type.

5. Replace oil with fresh, specified type.



8. Distribute load to place boat on an even plane.


1. Have propeller repaired or replaced.

2. Install correct propeller to operate outboard at its recommended speed (r/min) range.

3. Adjust trim angle to achieve most efficient operation.

4. Have motor adjusted to proper transom height.

5. Find and correct cause of warning.

6. Clean boat bottom.


8. Remove foreign matter and clean lower unit.

9. Check for pinched or kinked fuel line or other obstructions in fuel system.



12. Inspect and adjust as specified.

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Trouble Possible Cause


14. Failed ignition parts.


E. Engine power loss.

16. Thermostat faulty or clogged.

17. Air vent screw closed.

18. Fuel pump damaged.

19. Fuel joint connection incorrect.

20. Heat range of spark plug incorrect.

F. Engine vibrates excessively.

1. Propeller damaged.

2. Propeller shaft damaged.

3. Weeds or other foreign matter tangled on propeller.

4. Motor mounting bolt loose.

5. Steering pivot loose or damaged.

Remedy





15. Check and replace oil with specified type.


17. Open the air vent screw.


19. Connect correctly.

20. Inspect spark plug and replace it with recommended type.

1. Have propeller repaired or replaced.


3. Remove and clean propeller.

4. Tighten bolt.

5. Tighten or have serviced by a

Yamaha dealer.

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TEMPORARY ACTION IN

EMERGENCY

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IMPACT DAMAGE

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The outboard motor can be seriously damaged by a collision while operating or trailering. Damage could make the outboard motor unsafe to operate.

If the outboard motor hits any object in the water, follow the procedure below;

1) Stop the engine immediately .

2) Inspect control system and all components for damage . Also, inspect the boat damage .

3) However damage is found or not found, go back to a nearest harbor slowly and carefully.

4) Have a Yamaha dealer inspection of the outboard motor, before operating it again.

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EMG65110

POWER TRIM / TILT WILL NOT

OPERATE

If the engine cannot be tilted up or down with the power trim and tilt because of a discharged battery or a failure with the power trim and tilt unit, the engine can be tilted manually. Loosen the manual valve screw counterclockwise until it stops. Put the engine in the desired position, then tighten the manual valve screw clockwise.

1 Manual valve screw

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STARTER WILL NOT OPERATE

If the starter mechanism does not operate

(engine cannot be cranked with the starter), the engine can be started with an emergency starter rope.

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8 Use this procedure only in an emer- gency and only to return to port for repairs.

8 When the emergency starter rope is used to start the engine, the start-ingear protection device does not operate. Make sure the transmission is in neutral. Otherwise, the boat could unexpectedly start to move, which could result in an accident.

8 Be sure no one is standing behind you when pulling the starter rope. It could whip behind you and injure someone.

8 An unguarded rotating flywheel is very dangerous. Keep loose clothing and other objects away when starting the engine. Use the emergency starter rope only as instructed. Do not touch the flywheel or other moving parts when the engine is running. Do not install the starter mechanism or top cowling after the engine is running.

8 Do not touch the ignition coil, high voltage wire, spark plug cap or other electrical components when starting of operating the motor. You could be shocked.

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Procedure

1) Remove the top cowling.

2) Remove the starter/flywheel cover by removing the bolts.

NOTE:

On a model equipped with the start-ingear protection device (cable), disconnect the cable from the starter.

208026

OFF ON START

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3) Prepare the engine for starting. See

“STARTING ENGINE” for procedures.

Be sure the engine is in Neutral and that the lanyard is attached to the engine stop switch.

The main switch must be on if the main switch is equipped on the electric start model.

NOTE:

Prime start model

If the engine will not start with this procedure, refer to “ENGINE FAILS TO OPER-

ATE”.

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5-7

4) To start the engine with emergency starter rope, insert the knotted end of the rope into the notch in the flywheel rotor and wind the rope several turns clockwise. Then, give a strong pull straight out to crank the engine.

Repeat if necessary.

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ENGINE FAILS TO OPERATE

Cold engine fails to start (for Prime start model)

If a cold engine fails to start, use the following procedure.

1) Adjust the trim angle so that the drive shaft is at right angles to the water surface or is trimmed in.

2) Open the emergency starter valve located behind the silencer cover on the front side.

OPEN

CLOSE

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3) Squeeze the priming pump two or three times to feed fuel.

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4) Turn the neutral throttle lever on the remote control box upwards. (It is necessary to change the throttle opening slightly depending on the engine temperature.) c C

The operation of the neutral throttle lever is possible only when the remote control lever is in the “Newtral” position.

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OFF

ON

START

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5) Set the MAIN SWITCH to “ON”.

6) Set the MAIN SWITCH to “START”.

NOTE:

When the starter mechanism malfunctions, refer to “STARTER WILL NOT OPERATE”.

c C

8 Do not turn the main switch to

“START”when the engine is running.

8 Do not keep the starter-motor turning for more than 5 seconds with the main switch in the “START” position. If the engine does not start within 5 seconds, return the main switch to “ON”, wait 10 seconds, and then crank the engine again. (If the starter-motor is run continuously for more than 5 seconds, the battery will rapidly become exhausted and it will be impossible for the startermotor to start the engine.)

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CLOSE

OPEN

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5-9

7) Return the neutral throttle lever slowly to its home position so that the engine does not stall.

8) After the engine starts, return the emergency starter valve (if used) to

“CLOSE”.

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When starting or operating the engine, do not touch the ignition coil, high voltage wire, spark plug cap or other electrical parts carrying high voltage. Keep loose clothing and other objects away from the engine when starting it with an emergency starter rope. An unguarded rotating flywheel is very dangerous. Do not attempt to replace the top cowling when the engine is running. Proceed at once to the nearest port to get the engine repaired. Take care to prevent water splashing onto the flywheel.

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TREATMENT OF SUBMERGED

MOTOR

If the outboard motor is submerged, immediately take it a Yamaha dealer. Otherwise, some corrosion may begin almost immediately. If you cannot immediately take the outboard motor to a Yamaha dealer, follow the procedure bellow for taking care to minimize engine damage.

1) Thoroughly wash away mud, salt, seaweed, etc. with fresh water.

2) Remove the spark plugs and face the spark plug holes downward to allow any water, mud or contaminants to drain.

3) Drain the fuel from the carburetor.

4) Feed fogging oil or engine oil through the carburetors and spark plug holes while cranking with the manual starter or emergency starter rope.

5) Take the outboard motor to a Yamaha dealer as soon as possible.

c C

Do not attempt to run the motor until it has been completely inspected.

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-MEMO-

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TROUBLE RECOVERY. Yamaha 50A, 40A

Chapter 5

TROUBLE RECOVERY

IMPACT DAMAGE

POWER TRIM / TILT WILL NOT

OPERATE

STARTER WILL NOT OPERATE

ENGINE FAILS TO OPERATE

TREATMENT OF SUBMERGED

MOTOR

-MEMO-

Related manuals

Table of contents

TROUBLE RECOVERY. Yamaha 50A, 40A

Chapter 5