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Problem: Engine idles poorly
Condition Remedy
1. Valve clearance out of adjustment
2. Valve seating poor
3. Valve guides defective
4. Fuel injector obstructed
1. Adjust clearance
2. Replace — service seats — valves
3. Replace guides
4. Replace fuel injector
Problem: Engine runs poorly at high speed
Condition Remedy
1. Valve springs weak
2. Valves mistimed
3. Cams worn
4. Air cleaner element obstructed
5. Fuel hose obstructed
6. Ignition coil defective
1. Replace springs
2. Re-time valves
3. Replace cams
4. Clean — replace element
5. Clean — replace hose
6. Replace ignition coil
Problem: Exhaust smoke dirty or heavy
Condition Remedy
1. Oil (in the engine) overfilled — contaminated
2. Piston rings — cylinder worn
3. Valve guides worn
4. Cylinder wall scored — scuffed
5. Valve stems worn
6. Stem seals defective
7. Air cleaner element obstructed
1. Drain excess oil — replace oil
2. Replace — service rings — cylinder
3. Replace guides
4. Replace — bore engine block
5. Replace valves
6. Replace seals
7. Clean — replace element
Problem: Engine lacks power
Condition Remedy
1. Valve clearance incorrect
2. Valve springs weak
3. Valves mistimed
4. Piston ring(s) — cylinder worn
5. Valve seating poor
6. Cams worn
7. Air cleaner element obstructed
8. Oil (in the engine) overfilled — contaminated
1. Adjust clearance
2. Replace springs
3. Re-time valves
4. Replace — service rings — engine block
5. Repair seats
6. Replace cams
7. Clean element
8. Drain excess oil — change oil
Problem: Engine overheats
Condition Remedy
1. Air filter restricted
2. Oil low
3. Fuel incorrect
4. Oil pump defective
5. Oil circuit obstructed
6. Coolant level low
7. Fan malfunctioning
8. Fan switch malfunctioning
9. Thermostat stuck — closed
10. Radiator hoses — cap damaged — obstructed
1. Clean — replace air filter
2. Add oil
3. Drain — replace fuel
4. Replace pump
5. Clean circuit
6. Fill — examine system for leaks
7. Check fan fuse — replace fan
8. Replace fan switch
9. Replace thermostat
10. Clear obstruction — replace hoses
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