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 21 of 657
TM 9-2320-260-34-1
Table
2-1.
Mechanical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
7.
BLACK EXHAUST SMOKE AT IDLE
Check if engine maximum governed speed is set too high.
Adjust maximum engine governed speed to specification if incorrect (para. 5-25).
END OF TESTING!
8.
ENGINE SURGES
Step 1.
Step 2.
Check for low fuel supply at fuel pump and injectors.
Perform malfunction 20 if fuel supply is low.
Check for excess fuel supply.
Perform malfunction 22 if fuel supply is excessive.
END OF TESTING!
9. ENGINE MISFIRES DURING NORMAL OPERATION
10.
11.
Step 1.
Step 2.
Step 3.
Check fuel injector operation.
Replace fuel injectors if defective (para. 5-6).
Check engine valve train operation and valve lash adjustment.
Correct valve train operation and adjust valves to specifications if incorrect (para. 3-82,
3-83, or 3-84).
Check engine cylinder compression.
Perform engine cylinder compression test (malfunction 12).
END OF TESTING!
ENGINE STOPS DURING NORMAL OPERATION (ENGINE
Perform malfunctions 4 and 5.
END OF TESTING!
ENGINE STOPS DURING NORMAL OPERATION (ENGINE
Step 1. Crank engine (TM 9-2320-260-10).
RESTARTS)
DOES NOT RESTART)
a. Perform malfunction 1, step 5 if engine will not crank.
b. Proceed to step 2 if engine cranks.
Step 2. Check low oil pressure lockout switch (TM 9-2320-260-20).
a. Replace low oil pressure lockout switch if damaged (TM 9-2320-260-20).
b. Perform malfunction 21 if low oil pressure lockout switch is operative.
END OF TESTING!
2-7
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