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 TM 10-3930-644-14&P
TROUBLE
PROBABLE CAUSE
POSSIBLE SOLUTION
Engine misfires.
Uneven compression.
Check compression and ad-
just or grind valves.
Wet or deteriorated high
Dry wires. Replace defec-
tension wires.
tive wires.
Defective spark plugs.
Replace spark plugs.
Cracked distributor cap.
Replace cap.
Points not gapped properly
Repair distributor.
or defective.
Engine not properly timed.
Time engine.
Engine runs unevenly at
Spark plugs not gapped pro-
Cap or replace spark plugs.
idle speed.
perly.
Idle adjustment on carbu-
Adjust carburetor idle.
retor not properly set.
Wrong float level.
Repair carburetor.
Carburetor or intake mani-
Repair carburetor or re-
fold leaking.
place manifold gasket.
Cylinder head gasket leak-
Replace gasket.
ing.
Valves out of adjustment or
Adjust or replace valves.
damaged.
Engine misfires at high
Points not properly adjust-
Adjust points.
speed.
ed.
Distributor breaker arm
Replace spring.
spring defective.
Valve springs weak or
Replace valve springs.
broken.
Spark plugs not gapped pro-
Adjust spark plug gap or
perly or incorrect plugs.
replace plugs.
Engine backfires.
Improper timing.
Time engine.
Air cleaner dirty or clog-
Service air cleaner.
ged.
Fuel line bent or plugged.
Clean or replace fuel line.
Carburetor dirty.
Clean carburetor.
Valves sticking.
Repair valves.
Weak or broken valve
Replace springs.
springs.
Engine pings excessively.
Too low of gas octane
Fill with proper grade of
rating.
gas.
Incorrect engine timing.
Time engine.
M-104-1
2-12
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