TM-9-2320-361-34
2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
MAY 1992
TM-9-2320-361-34 - Page 27 of 764
TM9-2320-361-34
Table 2-1. Mechanical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 5. Check oil cooler for leaks, restrictions, or defects. Remove and inspect oil cooler (para.3-l4).
a. If oil cooler is restricted, clean.
b. If oil cooler gasket is defective, replace (para. 3-14).
Step 6.
Step 7.
Step 8.
Step 9.
Step 10.
Step 11.
Check turbocharger for internal and external oil leaks. Remove and inspect turbocharger
(para. 5-6).
If oil is present inside turbocharger housing, on hub fins, or externally on housing, but not
in the area of oil inlet or outlet ports, replace turbocharger (para. 5-6).
Check fuel injection pump for external oil leaks.
If fuel injection pump is leaking oil, replace (para. 5-4) and repair fuel injection pump
(TM9-2815-210-34-2-2).
Check fuel injection pump for internal oil leaks at drive gear input shaft. Remove drive
gear access cover (para. 5-4).
●
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.
Clean all existing oil traces from drive gear area of timing cover housing. Operate engine
and visually check for oil flow from drive gear housing or timing cover.
If oil flow is rapid from drive gear area, replace fuel injection pump (para. 5-4) and repair
fuel injection pump (TM9-2815-210-34-2-2).
Check camshaft and bearings for wear or defects.
If camshaft or bearings are worn or defective, replace engine (para. 3-18) and repair engine
(TM9-2815-210-34-2-2).
NOTE
When engine oil pressure remains low after completing trouble-
shooting, internal engine block oil passage failure is indicated.
Replace engine (para. 3-18).
END OF TESTING!
14.
ENGINE OIL PRESSURE EXTREMELY HIGH AT NORMAL OPERATING TEMPERATURE
Step 1. Check oil pressure regulator for leaks or defective operation. Remove oil pressure regulator
and inspect (para. 3-13).
If oil pressure regulator is defective, replace (para. 3-13).
NOTE
Continued high oil pressure may indicate that internal engine
bearings are spun, the engine block oil feed is restricted, or the
return passages are restricted.
2-12
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