TM-9-2320-361-20
2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; UNIT MAINTENANCE
OCTOBER 1991
TM-9-2320-361-20 - Page 116 of 1207
TM 9-2320-361-20
Table 2-2. Mechanical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
8. ENGINE SURGES
Step 1. Check fuel system for contamination and restrictions.
Refer to malfunction 2, steps 3 and 4.
Step 2. Inspect throttle linkage for proper operation and adjustment
If linkage does not operate properly, adjust or replace as necessary (para. 3-33).
Step 3. Check in-tank fuel pump operation (para. 3-26).
If fuel pressure is uneven or below specifications, replace (para. 3-26).
END OF TESTING!
9. EXCESSIVE OIL LOSS OR CONSUMPTION DURING NORMAL OPERATION
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Check oil for overfilling. Check oil level (TM 9-2320-361-10).
If oil level is too high, drain crankcase to safe operating level (LO 9-2320-209-12-1).
Check for external oil leaks at oil pan, drainplug, oil filter, oil filter housing, oil cooler, oil
dipstick tube, rocker arm cover, and oil feed lines.
Tighten any loose connections or loose screws that may cause leaks.
Check maximum engine governed speed set within specifications (para. 8-29).
If maximum engine governed speed is incorrect, adjust (para. 8-29).
Complete troubleshooting malfunction 10, step 4.
If oil leaks still exist, or engine still burns oil, notify your supervisor.
END OF TESTING!
10. ENGINE OIL PRESSURE TOO LOW OR TOO HIGH AT NORMAL OPERATION TEMPERATURE
CAUTION
Do not operate engine except during testing. When condition of no
oil pressure is evident, continued operations may damage engine
internally.
Step 1. Check engine oil level (LO 9-2320-209-12-1).
If level is low, check for external oil leaks at oil pan, drainplug, oil filter, oil filter housing,
oil cooler, oil dipstick tube, and rocker arm cover.
Tighten any loose connections or loose screws that may cause leaks.
Step 2. Check engine for excessive engine operating temperature (TM 9-2320-361-10).
Step 3. Check that engine oil grade is correct for vehicle use and climate conditions (LO 9-2320-
209-12-1).
If engine oil grade is incorrect, replace oil (LO 9-2320-209-12-1).
Step 4. Check oil pressure gage for proper operation.
a. Check operation of oil pressure gage (table 2-4, malfunction 32).
b. Check oil pressure. Oil pressure should be 40-75 psi at 2,600 rpm.
If oil pressure gage has a maximum reading of 60 psi and needle peaks at 60 psi,
replace with new oil pressure gage (range 0-120 psi) (para. 4-12).
c. If oil pressure is still too high or too low, notify your supervisor.
Step 5. Check all external oil fuel lines for leakage or restrictions. Clear restrictions or repair leaks.
END OF TESTING!
2-31
Back to Top
