TM-9-2320-361-24-1
2-1/2 TON, 6X6, M44A2 SERIES TRUCKS
TECHNICAL MANUAL; FIELD AND SUSTAINMENT MAINTENANCE PART 1 OF 2
AUGUST 2006
TM-9-2320-361-24-1 - Page 137 of 1176
TM 9-2320-361-24-1
0008 00
0008 00-9
MECHANICAL SYSTEMS TROUBLESHOOTING - DIRECT SUPPORT (Contd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
12. EXHAUST COLOR
WHITE DURING
NORMAL
OPERATION AND
IDLE
(Contd)
3. Test run vehicle after replacing
cylinder heads and gaskets. If
exhaust color remains white,
internal engine block cooling
jacket failure is indicated.
2. If coolant is present on oil
dipstick, check intake manifold
and gaskets for defects. See
WP 0008 00, table 1,
malfunction 1, step 11.
3. If coolant is present on dipstick,
check cylinder heads and gaskets
for defects. (WP 0027 00).
Replace engine (WP 0046 00).
13. ENGINE OIL
PRESSURE LOW OR
ZERO AT NORMAL
OPERATING
TEMPERATURE
CAUTION
Do not operate engine except during
testing when condition of no oil
pressure is evident. Continued
operation may damage engine
internally.
1. Check oil pressure regulator for
leaks or defective operation.
Remove oil pressure regulator and
inspect for defects (WP 0037 00).
NOTE
When oil pump operation or
condition becomes defective, usually
there is a lack of oil supply or
restriction from oil sludge.
2. Remove oil pan and oil pump and
inspect for defects (WP 0035 00
and WP 0036 00).
3. Check oil pick up for restrictions.
NOTE
Lack of oil supply due to oil pick up
restrictions reducing or cutting off oil
supply may cause damage to main
and rod bearings, crankshaft, and
rods.
4. Inspect crankshaft for nicks,
burns, scuffs, or discoloration due
to overheating.
If oil pressure regulator is defective,
replace (WP 0037 00).
If oil pump is defective, repair or
replace (WP 0036 00). Do not install
oil pick up or oil pan when
reinstalling oil pump.
If oil pick up is restricted, clean or
replace (WP 0036 00). Do not install
oil pan when reinstalling oil pickup.
Replace engine if crankshaft is
damaged (WP 0046 00).
Table 1. Engine Troubleshooting Procedures (Contd).
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