TM 5-3810-294-34
Table 2-1. Troubleshooting - Continued
Malfunction
Probable Cause
Corrective Action
a. Low octane fuel.
a. Refer to TM 5-3810-294-10 and
5. Engine noisy
drain fuel tank. Fill tank with
proper fuel.
b. Excessive tappet clearance.
b. Refer to TM 5-3810-294-20 and
adjust tappets.
c. Bearings worn or damaged.
c. Knocking, pounding, or similar
noises are serious.. Locate the
sound, and repair or replace the
bearings or other parts involved.
Any unusual engine sound must
be accounted for and corrected.
a. Thermostat stuck open or
a. Refer to TM 5-3810-294-20 and
6. Engine fails to reach operating
temperature.
removed from vehicle.
replace thermostat.
b. Defective temperature sending
b. Refer to TM 5-3810-294-20 and
unit or engine control panel gage.
replace defective unit.
a. Rain shutters closed.
a. Open rain shutters.
7. Engine overheats.
b. Radiator coolant level low.
b. Add coolant.
c. Engine oil level low.
c. Add oil.
d. Loose radiator hose connections. d. Tighten hose connections. Add
coolant as required.
e. Water pump V-belt loose.
e. Refer to TM 5-3810-294-20 and
adjust V-belt.
f. Water pump faulty.
f. Refer to TM 5-3810-294-20 and
replace water pump.
g. Collapsed or clogged hoses,
g. Refer to TM 5-3810-294-20 and
replace hoses.
h. Defective thermostat.
h. Refer to TM 5-3810-294-20 and
replace thermostat.
i. Radiator leaks or is clogged.
i. Refer to TM 5-3810-294-20 and
replace radiator.
j. Engine leaking oil:
j. Refer to TM 5-3810-294-20 and:
(1) Oil filter leaks.
(1) Replace oil filter.
(2) Leakage at any external
(2) Replace piping.
piping.
k. Excessive engine internal friction k. This is a serious condition which
or excessive load on engine, due
can be corrected only by overhaul
to excess friction in driven items,
of the item which is faulty.
such as transmission.
Determine cause and overhaul
the overheated binding assembly.
a. Engine oil level low.
a. Add oil.
8. Low oil pressure.
b. Loose connections in oil lines.
b. Tighten oil line connections.
c. Refer to TM 5-3810-294-20 and
c. Oil filter clogged.
change oil filter.
d. Oil too thin due to dilution or too
d. Drain crankcase and refill with
light a grade used.
proper oil.
e. Faulty oil pressure sender.
e. Refer to TM 5-3810-294-20 and
replace oil pressure sender.
f. Worn main hearings, connecting
f Repair engine as required (chap. 4
rod bearings, or excessive
and 13).
clearance in other engine parts.
a. Oil too heavy.
a. Drain crankcase and refill with
9). High oil pressure.
proper oil.
b. Defective oil pressure gage on
b. Refer to TM 5-3810-294-20 and
engine control panel.
replace oil pressure gage.
a. Oil leaks
a. Check oil lines. Tighten any loose
10. Excessive oil consumption
connections.
proper oil.
c. Clogged oil pressure relief
c. Clean oil pressure relief passage.
passage causing back pressure
in crankcase.
d. Broken or worn valves, rings,
d. Refer to TM 5-3810-294-20 and
pistons, or connecting rod
check compression. Repair or
bearings struck valves.
replace rings and/or valves as
required (chap. 4 and 13). Free
valves and replace faulty valves,
2-3
