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 27 of 657
TM 9-2320-260-34-1
Table 2-1. Mechanical Troubleshoting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
23.
24.
25.
26.
Step 4. Check cylinder heads for damage or defects. Remove cylinder heads (para.3-18) and
check for warped cylinder heads, faulty gaskets, and burned or improperly seated valves
(para. 3-51).
a.
b.
c.
Replace or repair cylinder heads if warped.
Perform valve maintenance as necessary (para. 3-77).
While cylinder heads are removed, check for worn or scored cylinder liners and broken
piston rings. Replace cylinder liners if scored (para. 3-50) and piston rings if broken
(para. 3-47).
END OF TESTING!
ENGINE IDLE ROUGH, ERRATIC
Step 1. Check for incorrect fuel injector and valve adjustments.
a. Adjust injectors and/or valves as necessary (para. 3-82, 3-83, or 3-84).
b. Replace fuel injectors (paras. 5-6) if fuel injectors are defective.
c. Replace fuel pump if rough idle continues (para. 5-13).
Step 2. Perform malfunction 22, step 4 if rough idle and missing continues.
END OF TESTING!
ENGINE OVERSPEEDS
Replace fuel pump with calibrated replacement unit (para. 5-13).
END OF TESTING!
ENGINE LUBRICATING OIL DILUTED BY FUEL
Check for incorrect fuel injector adjustment and proper operation.
a. Adjust fuel injectors as necessary (para. 3-82, 3-83, or 3-84).
b. Clean or replace fuel injector(s) if defective (para. 5-6).
END OF TESTING!
ENGINE KNOCKS
Step 1. Check valve and injector timing (para. 3-82, 3-83, or 3-84).
Step 2. Perform malfunctions 21 and 22.
Step 3. Perform malfunction 18, step 5.
END OF TESTING!
2-13
Back to Top
