Problem: Engine lacks power Condition
Remedy
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14.
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14.
Valve clearance incorrect Valve springs weak Valve timing incorrect Piston ring(s) - cylinder worn Valve seating poor Spark plug fouled Rocker arms - shafts worn Spark plug gap incorrect Carburetor jets/fuel injector obstructed Float level out of adjustment Air cleaner element obstructed Engine oil overfilled - contaminated Intake manifold leaking air Cam chain worn
Adjust clearance Replace springs Re-time valve gear Replace - service rings - cylinder Repair seats Clean - replace plug Replace arms - shafts Adjust gap - replace plug Clean jets - replace injector Adjust float height Clean element Drain excess oil - change oil Tighten - replace manifold Replace cam chain
Problem: Engine overheats Condition
Remedy
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12.
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12.
3-6
Carbon deposit (piston crown) excessive Oil low Octane low - gasoline poor Oil pump defective Oil circuit obstructed Gasoline level (in float chamber) too low Intake manifold leaking air Coolant level low Fan malfunctioning Fan switch malfunctioning Thermostat stuck - closed Radiator hoses - cap damaged - obstructed
Clean piston Add oil Drain - replace gasoline Replace pump Clean circuit Adjust float height Tighten - replace manifold Fill - examine system for leaks Check fan fuse - replace fan Replace fan switch Replace thermostat Clear obstruction - replace hoses