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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 knocks or is noisy.
Poor gas.
Refill with proper fuel.
(cont'd)
Overloads at low operating
Check loading and correct.
speeds.
Worn main bearings or
Overhaul engine.
crankshaft.
Excessive crankshaft end
Correct end play to speci-
play.
fications.
Worn or burned out connect-
Replace bearings.
ing red bearings.
Loose or worn piston pins.
Replace pistons and pins.
Piston loose in cylinder.
Replace piston and/or
sleeve.
Broken piston ring.
Replace piston rings.
Burned valves or seats.
Replace valves and or
seats.
Weak or broken valve
Replace springs.
springs.
Valves sticking.
Repair or replace valves.
Tappets worn or out of ad-
Replace or adjust tappets.
justment.
Loose or worn camshaft
Replace camshaft bearings.
bearings.
Excessive camshaft end
Adjust end play or replace
play.
camshaft.
Gears in gear train worn
Repair or replace gear
or loose.
train.
Engine not aligned with
Align engine.
transmission or pump.
Loose, bent, or off center
Repair or replace coupling.
coupling.
Engine not securely mount-
Tighten engine mountings.
ed.
Flywheel out of balance.
Repair or replace flywheel.
M-104-1
2-15
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