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 138 of 1176
TM 9-2320-361-24-1
0008 00
0008 00-10
MECHANICAL SYSTEMS TROUBLESHOOTING - DIRECT SUPPORT (Contd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
13. ENGINE OIL
PRESSURE LOW OR
ZERO AT NORMAL
OPERATING
TEMPERATURE
(Contd)
5. Remove and inspect oil cooler for
leaks, restrictions, or defects.
6. Remove and inspect turbocharger
for internal and external oil
leaks (WP 0057 00).
7. Check fuel injection pump for
external oil leaks.
8. Remove drive gear access cover
(WP 0069 00) and inspect fuel
injection pump for internal oil
leaks at drive gear input shaft.
WARNING
• Eye protection is required during
inspection of fuel injection pump
and drive gear input shaft seal
with engine operating. Oil may
spray or splash from gear area.
Failure to wear eye protection
may result in injury to personnel.
• Stay clear of drive gear area
during inspection of input shaft
seal when engine is operating.
Failure to stay clear of drive gear
area may result in injury to
personnel.
NOTE
When engine oil pressure remains
low after completing troubleshooting,
internal engine block oil passage
failure is indicated.
9. Clean all existing oil traces from
drive gear area of timing cover
housing. Operate engine and
visually inspect for oil flow from
drive gear housing or timing
cover.
10. Check camshaft and bearings for
wear or defects.
1. If oil cooler is restricted, clean.
2. If oil cooler gasket is defective,
replace (WP 0038 00).
If oil is present inside turbocharger
housing, on hub fins, or externally on
housing, but not in area of oil inlet or
outlet ports, replace turbocharger
(WP 0057 00).
If fuel injection pump is leaking oil,
replace (WP 0069 00).
If oil leaks are present at drive gear
input shaft, replace fuel injection
pump (WP 0069 00).
If oil flow is rapid from drive gear
area, replace fuel injection pump
(WP 0069 00).
If camshaft or bearings are defective,
replace engine (WP 0046 00).
Table 1. Engine Troubleshooting Procedures (Contd).
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