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8-3 SERVICING INFORMATION
Complaint
Dirty or heavy
exhaust smoke
Engine lacks
power.
Engine
overheats.
Symptom and possible causes
1. Too much engine oil in the engine.
2. Worn piston rings or cylinder.
3. Worn valve guides.
4. Cylinder wall scored or scuffed.
5. Worn valves stems.
6. Defective stem seals.
7. Worn side rails.
1. Loosen of valve clearance.
2. Weakened valve springs.
3. Valve timing out of adjustment.
4. Worn piston ring or cylinder.
5. Poor seating of valves.
6. Fouled spark plug.
7. Worn camshaft.
8. Spark plug gap incorrect.
9. Clogged jets in carburetor.
10. Float-chamber fuel level out of adjustment.
11. Clogged air cleaner element.
12. Too much enging oil.
13. Defective air intake pipe.
1. Heavy carbon deposit on piston head.
2. Not enough oil in the engine.
3. Defective oil pump or clogged oil circuit.
4. Fuel level too low in float chamber.
5. Air leak from intake pipe.
6. Use of incorrect engine oil.
7. Defective cooling system.
Remedy
Check with inspection win-
dow, drain out excess oil.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Adjust.
Replace.
Adjust.
Replace.
Repair or replace.
Clean or replace.
Replace.
Adjust or replace.
Clean.
Adjust.
Clean.
Drain out excess oil.
Retighten or replace.
Clean.
Add oil.
Repair or clean.
Adjust.
Retighten or replace.
Change.
See "Cooling system" section.
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