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Page Title:
TROUBLESHOOTING CHART - continued |
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 TM 10-3930-644-14&P
TROUBLE
PROBABLE CAUSE
POSSIBLE SOLUTION
Engine overheats. (cont'd)
Water pump defective.
Repair or replace water
pump.
Engine overloaded.
Check loading and reduce
as necessary.
Low oil pressure.
Low oil level.
Refill crankcase.
Defective oil pressure
Repair or replace gauge
gauge or pressure sender.
and/or sender.
incorrect grades of oil.
Drain and refill with cor-
rect grade.
Oil pump suction screen
Clean screen.
clogged.
Dirty or defective relief
Clean or repair relief
valve.
valve.
Defective oil pump.
Repair or replace oil pump.
Worn bearings.
Replace bearings.
Worn camshaft bushings.
Replace bushings.
Oil pressure to high.
Incorrect grade of oil.
Drain and refill crankcase
with correct grade of oil.
Defective or damaged relief
Repair or replace relief
valve.
valve.
Oil lines or galleries
Overhaul engine.
plugged.
Oil pressure gauge defec-
Replace gauge.
tive.
Engine burns oil excessive-
Leak in oil system.
Check and correct.
ly.
Oil level too high.
Fill to proper level.
Incorrect grade of oil.
Drain and refill with cor-
rect grade.
Crankcase breather clogged.
Clean breather.
Defective or damaged relief
Repair or replace relief
valve.
valve.
Piston rings worn, broken
Replace rings.
or stuck.
Worn pistons and sleeves.
Replace pistons and
sleeves.
Worn bearings.
Replace bearings.
Worn valve guides.
Replace valve guides.
Engine knocks or is noisy.
Incorrect timing.
Time engine.
Excessive carbon buildup.
Clean cylinder head and
pistons.
M-104-1
2-14
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