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Section IV. OPERATOR'S MAINTENANCE
3-8. General
water at proper intervals.
Refer to the MAC
Maintenance to be performed by the operator is limited
(maintenance allocation chart) Appendix C.
to the replenishment of fuel, oil, coolant, and battery
Section V. TROUBLESHOOTING
3-12. Engine Knocks or Develops Unusual Noise
3-9. General
Probable cause
---- Possible remedy
This section provides information useful in diagnosing
Crankcase oil supply too ---- Aid oil to proper level.
and correcting unsatisfactory operation or failure of the
low.
---- Refer to figure 3-1.
pumping assembly and its components. Each trouble
Caution
symptom state is followed by a list of probable causes.
If the engine knocks or is noisy
The possible remedy recommended is described
when the crankcase is filled with oil
opposite the probable cause. Any trouble beyond the
to its proper level, stop the engine
scope of organizational maintenance shall be reported
immediately
and
report
the
to direct support maintenance.
condition to field maintenance.
In troubleshooting, never make more than one
Continued operation of the unit
adjustment at a time; then locate the trouble by a
under these conditions can cause
process of elimination. Usually the cause will be Simple
serious damage to the engine.
rather than complex.
Accessory mountings ---- Tighten all loose connec-
loose.
---- tions.
If the engine cranks over but fails to start, for example,
Valve adjustment incor- ---- Adjust valves (p ara 3-36).
the trouble is almost certainly either in the ignition or the
rect.
fuel system, and a quick check should determine which
Timing incorrect
---- Adjust engine timing (para
system to examine further.
3-10. Engine Fails to Start or Is Hard to Start
3-13. Engine Stops Suddenly
Probable cause
Possible remedy
Probable cause
Possible remedy
Fuel tank empty
---- Fill fuel tank.
Fuel tank empty
---- Fill fuel tank.
Air cleaner clogged
---- Service air cleaner (para
Air cleaner clogged
---- Service air cleaner (para
Spark plugs defective ---- Adjust or replace spark
Oil pressure too low
---- Add oil to the proper level.
plugs (para 3-50).
Refer to figure 3-1.
Carburetor defective
---- Replace carburetor (para
Fuel pump defective
---- Replace fuel pump (para
Magneto defective
---- Replace magneto (para
Coolant too hot
---- Fill cooling system (para
Magneto contacts not ---- Adjust magneto contacts
thermostat (para 3-59).
closing.
Replace defective V-belts
Fuel pump defective
---- Replace fuel pump (para
Caution
Cranking motor fails to ---- Refer to paragraph 3-48.
Never
add
coolant
to
an
crank engine.
excessively hot engine block.
3-11. Engine Misses or Runs Erratically
Failure to observe this caution may
Probable cause
Possible remedy
result in damage to the engine
Air cleaner clogged
---- Service air cleaner (para
block.
Spark plugs defective ---- Adjust or replace spark
3-14. Engine Overheats
plugs (para 3-50).
Probable cause
Possible remedy
Spark plug leads defec- ---- Replace leads (para 3-50).
Crankcase oil too low ---- Add oil to proper level. Re-
tive.
fer to current lubrication
Probable cause
Possible remedy
order.
Governor defective
---- Replace governor (para
Coolant low in radiator ---- Fill cooling system.
Valve adjustment incor- ------ Adjust valves (para 3-36).
rect.
3-14
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