TM 9-2350-230-12
Malfunction
Probable cause
Corrective action
ENGINE - Continued
10. Engine overheats
a. Restricted cooling air
a. The exterior of the radiator
passages
core may be plugged,
restricting normal air
flow. Clean radiator with
air, water, or steam.
b. Low coolant level
b. Check coolant level and
fill as required. If
abnormal amount of water
is required to fill the
coolant system, inspect
for loose connections or
source for leakage.
Notify support mainte-
nance if cause is other
than the coolant system.
c. Improper coolant fan
c. Check the coolant fan drive
operation
belts for proper tension.
Adjust as required.
If fan does not operate with
a coolant temperature of
185F, lock up clutch
support maintenance.
d. Pressure cap defective
d.
Replace cap.
e. Thermostat inoperative
e.
The thermostat may be
defective and not open at
normal operation tem-
perature. Remove and
test in hot water bath
(167-192F). If defective,
replace.
f
Coolant pump drive belt
f.
Tighten or replace belt
slipping
g. Coolant pump failure
g.
Inspect the coolant pump for
damaged impeller.
If defective, replace (Fig.
h. Malfunction of lubrication
h.
The oil filter may be
system
clogged causing a re-
striction in circulation of
lubricant. Inspect filter.
Check oil level in accor-
dance with LO 9-2350-230-
12. If oil level drops
continually, notify support
maintenance.
8-16
