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Figure 3-5. Quarterly preventive maintenance services. (cont) - TM-5-4310-227-150059
Engine Overheats

TM-5-4310-227-15 Compressor Reciprocating: Air; Gasoline Engine 15 CFM 175 PSI; Receiver Mounted (Champion Pneumatic Model OEG-458-ENG-1) Manual
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TM 5-4310-227-15
Section IV. TROUBLESHOOTING
Probable cause
Possible remedy
3-10. General
Ignition cable loose or de-
This section provides information useful in
fective _______________Tighten or replace ignition
cable (para 3-45).
diagnosing and correcting unsatisfactory oper-
Magneto contact set out-
ation or failure of the air compressor and its
of-adjustment or defec-
trouble. The possible remedy recommended is
tive _________________Adjust contact set (para
f o l l o w e d by a list of probable causes of the
3-46). Report defective
trouble. The possible remedy recommended is
contact set to the proper
authority.
described opposite the probable cause. Any op-
Valve clearance incorrect __ Adjust the valve clearance
erational trouble that is beyond the scope of
(para 4-25).
t h e operator or organizational maintenance
Carburetor out-of -adjust-
m u s t be reported to direct support mainte-
ment or defective _______Adjust or replace the
nance.
carburetor (para 337).
Fuel strainer clogged ______ Service fuel strainer (para
3-36).
3-11. Engine is Hard To Start or Fails to
Choke partially closed _____ Open choke fully.
Start
Airflow restriction _________Service air cleaner (para
Probable cause
Possible remedy
3-6). Provide proper
Ground switch pushbutton
ventilation.
in grounded position ____Pull out on pushbutton
Governor linkage out-of -ad-
(para 2-22).
justment _______________Adjust the governor link-
Fuel tank empty ________Fill fuel tank (para 2-6).
age (para 3-39).
Fuel shutoff valve closed ___Open fuel shutoff valve.
Unloader assembly out-of -
Fuel mixture improper ____ Adjust the carburetor
adjustment or defective,
(para 3-37). Replenish
and is overloading en-
fuel supply with correct
gine __________________Ad just or replace unloader
grade of fuel. (Refer to
assembly (para 383).
appendix C).
Fuel contains water _____Drain fuel tank (para
Fuel strainer clogged ______Service fuel strainer (para
3-36), and replenish fuel
3-36) .
supply (para 2-6).
Carburetor clogged _________Replace carburetor (para
3-37) .
3-13. Engine Knocks
Cylinder flooded ----------Close the high speed ad-
justment valve, open
Possible remedy
Probable cause
governor control, and
Fuel of poor grade ______Drain fuel tank para 3-
crank engine until ex-
36) and replenish fuel
cess fuel is removed.
supply (para 2-6).
Spark plug dirty or dam-
Oil level low ____________Fill to proper oil level
aged ______________Clean,  adjust,  or  replace
(para 3-6).
spark plug (para 3-44).
Engine under heavy load
Magneto contact set defec- Adjust the contact set
at low speed ____________Open the governor control.
tive or out-of-adjustment (para 3-46). Report
Ignition timing advanced
defective contact set to
too far _______________Retime ignition (para 3-46)
the proper authority.
Magneto defective _________ Replace magneto (para
3-46).
3-14. Engine Exhaust Smoke Excessive
Ignition cable defective ____Replace the ignition cable
Possible remedy
Probable cause
(para 3-45).
Magneto out of timing _____Retime magneto (para
Carburetor out-of-adjust-
3-46).
ment or defective _______Adjust or replace the car-
buretor (para 3-37).
3-12. Engine Misses or Runs Erratically
Air cleaner dirty __________ Service air cleaner (para
Possible remedy
Probable cause
3-6).
Fuel of poor grade ________ Drain fuel tank (para
Spark plug dirty or dam-
3-36) and replenish fuel
aged - - - - - - - - - - - - - - - - - - - Clean, adjust, or replace
supply (para 2-6).
spark plug (para 3-44).
3-20






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