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TM 10-4320-202-15
Section IV. OPERATOR'S MAINTENANCE
b. Loosen bail nut and release bail.
3 - 8 . General
c. Remove bowl, gasket, and screen. Empty
The instructions in this section are published
contents of bowl.
for the information and guidance of the oper-
d. Clean bowl with approved cleaning sol-
ator to maintain the pumping assembly.
vent; wipe dry.
e. Replace screen, gasket and bowl, secure
3-9. Fuel Strainer Service
in place with bail, and tighten bail nut.
f. Open shutoff valve.
a. Close shutoff valve.
Section V. TROUBLESHOOTING
Possible remedy
Probable cause
3 - 1 0 . General
Report to direct support
Engine cylinder scored
maintenance.
or piston stuck.
This section provides information useful in
Repair or replace cable
Spark plug cable defec-
diagnosing and correcting unsatisfactory oper-
tive.
ation or failure of the pumping assembly and
Spark plug wet or dirty _-- Clean and regap spark
it's components. Each trouble symptom stated
plug (para 3-32).
is followed by a list of probable causes of the
Replace breaker points
Magneto breaker points
trouble. The possible remedy recommended is
pitted or fused.
described opposite the probable causes of the
Replace magneto capacitor
Magneto capacitor de-
trouble. The possible remedy recommended is
fective.
maintenance shall be reported to direct support
maintenance.
3-13. Engine Misses or Runs Erratically
Possible remedy
Probable
cause
3-11. Engine Hard to Start or Fails to Start
Clean, regap or replace
Spark plug dirty or im-
spark plug (para 332).
properly gapped.
Possile
remedy
Probable cause
Fuel tank empty_ _ _ _ _ Fill fuel tank.
Replace spark plug cable
Worn, loose or leaking
Open valve (para 2-12).
Fuel shutoff valve
spark plug cable.
closed.
Magneto breaker points
Adjust or replace breaker
Fuel line obstructed_ _ _ _ _ _Clean fuel line.
defective or improperly
points (pare 3-31).
Spark plug defective_ _ _ _ _ _Relace spark plug (para
adjusted.
Replace capacitor (para
Magneto capacitor defec-
Service air cleaner (para
Air cleaner dirty or too
331) .
tive.
3--4).
full of oil.
Drain and clean fuel tank
Contaminated _ _ _ _
Retime or replace magneto
Magneto improperly
and strainer (para 3-27).
timed or defective.
Refill tank with clean
Fuel mixture improper _ _ _ _ Adjust carburetor (para
fuel.
Replace cable (para 3-32).
Spark plug cable defec-
Adjust and tighten con-
Governor controls loose
tive.
trols.
or improperly ad-
justed.
3-12. Engine Stops Suddenly
Replace gasket and tighten
Cylinder head loose or
cy]inder head bo1td.
has faulty gasket.
Possible remedy
Probable Cause
Fuel tank empty_ _ _ _ _ _ _Fill fuel tank.
Fuel line obstructed_ _ _ _ _ _ Clean or replace fuel line.
3-14. Engine Fails to stop
Contaminated fuel _ _ _ _ _ _ Drain, clean and refill fuel
Possible remedy
Probable cause
tank with clean fuel.
Ignition switch defective _ _ Report to direct support
Cool engine and restart.
Excessive engine heat
maintenance.
Provide adequate venti-
causes vapor lock.
lation around engine.
Remove, clean and re-
Hot spot in combustion
place cylinder head
chamber.
Remove obstruction from
Air vent hole in fuel
cap hole,
tank cap clogged.
3-8
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