TM-9-2320-260-34-1
TRUCK, 5-TON, 6X6, M809 SERIES (DIESEL)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE; VOLUME 1 OF 2
JULY 1994
TM-9-2320-260-34-1 - Page 23 of 657
TM 9-2320-260-34-1
Table 2-1. Mechanical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
13. EXHAUST COLOR WHITE DURING NORMAL OPERATION AND IDLE
CAUTION
Thick white smoke indicates coolant is present in engine combus-
tion chambers during operation. When this condition is evident,
shut engine down immediately and determine cause. Continued
engine operation may result in permanent engine damage.
Step 1. Perform cooling system pressure test (malfunction 27).
Step 2. Check cylinder heads and gaskets for defects (para. 3-18).
NOTE
When engine exhaust color remains white during test run after
cylinder heads or gaskets replacement, internal engine block
cooling jacket failure is indicated.
Step 3. Replace engine (para. 3-24).
END OF TESTING!
14. ENGINE OIL PRESSURE LOW AT NORMAL ENGINE OPERATING TEMPERATURE
Step 1. Remove oil pan (para. 3-20) and check for excessive crankshaft bearing clearance.
Repair or replace engine if crankshaft bearing clearances are excessive (para. 3-24).
Step 2. Check oil pump operation.
Repair or replace oil pump if defective (para. 3-34 or 3-52).
NOTE
If engine oil pressure remains low after completing
troubleshooting, internal engine block oil passage failure is
indicated.
Step 3. Replace engine (para. 3-24).
15. ENGINE OIL
END OF TESTING!
PRESSURE EXTREMELY HIGH AT NORMAL OPERATING TEMPERATURE
NOTE
Continued high oil pressure may indicate spun internal engine
bearings or restricted engine block oil feed passages.
Disassemble engine (chapter 3, section IV) and check for spun bearings and restricted oil passages.
Replace engine (para. 3-24) if evidence of spun engine bearings or restricted oil passages is
found.
END OF TESTING!
2-9
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