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- Possible Causes
- __ Poor oil or lack of oil
- __ Foreign matter in engine, such as
loose nut in engine crankcase
- __ Carbon deposits in combustion chamber
- __ Incandescent spark plug points or
carbon particles
- __ Play in valve operating mechanism
- __ Loose connecting rod big end bearings
- __ Loose cylinder head retention bolts
- __ Loose flywheel
- __ Loose wrist pin bearings
- __ Worn main bearings
- __ Worn timing gears
- __ Worn cylinder, out of round
- __ Worn piston, permitting side slap
- __ High piston
- __ Tight piston rings
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