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 21. Oil at the exhaust
Cause
Correction
Too much oil in the valve compartment.
Be sure that there is plug in the end of the rocker
shaft.
Worn valve guides.
Reconditioning of the cylinder head is needed.
Worn piston rings.
Inspect and install new parts as needed.
22. Too much lubrication oil used
Cause
Correction
Too much lubrication oil in engine.
Remove extra oil. Find where extra oil comes
from.
Fill engine with oil to the FULL mark on the
dipstick. Then, check oil level while engine is
running. Do not put too much oil in engine.
Oil leaks.
Find all oil leaks. Make repairs as needed.
Check for dirty oil breather.
Oil temperature is too high.
Check operation of oil cooler. Install new parts if
necessary. Clean the core of the oil cooler.
Too much oil in the valve compartment.
Be sure that there is a plug in the end of the
rocker shaft.
Worn valve guides.
Recondition the cylinder head.
Worn piston rings.
Inspect and install new parts as needed.
23. Too much black or gray smoke
Cause
Correction
Not enough air for combustion.
Check air cleaner for restrictions.
Bad fuel injectors.
Install new fuel injectors.
Wrong fuel injection timing.
Make adjustments of timing.
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