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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 idles too fast.
Carburetor not properly ad-
Adjust carburetor idle.
justed.
Governor not properly ad-
Adjust governor.
justed.
Throttle not adjusted pro-
Adjust throttle or replace
perly or return spring is
spring.
weak.
Engine dies when at idle
Improper idle adjustment.
Adjust carburetor idle.
speed.
Carburetor dirty.
Clean carburetor.
Choke not properly adjusted.
Adjust choke.
Air leaks in manifold.
Check and correct.
Engine stumbles on acceler-
Carburetor out of adjustment.
Adjust carburetor.
ation.
Governor not adjusted pro-
Adjust governor.
perly.
Dirty carburetor.
Clean carburetor.
Air in fuel lines.
Check and clean fuel lines.
Engine lacks power.
Poor compression.
Adjust or grind valves.
Improper timing.
Time engine.
Throttle not adjusted pro-
Adjust throttle.
perly.
Air leak in fuel system.
Check and correct.
Air cleaner restricted.
Service air cleaner.
Exhaust system restricted.
Repair exhaust system.
Incorrect grade of gaso-
Fill with proper grade of
line.
gasoline.
Valves not adjusted pro-
Adjust valves.
perly.
Piston rings sticking or
Repair engine.
worn.
Engine overheats.
Coolant level low.
Replenish coolant.
Radiator clogged or leak-
Clean, repair or replace
ing.
radiator.
Fan belts slipping.
Adjust belt tension.
Thermostat sticking or de-
Replace thermostat.
fective.
Improper engine timing.
Time engine.
Exhaust system clogged or
Repair exhaust system.
defective.
M-104-1
2-13
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