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TM 5-2420-222-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5. ENGINE RUNS UNEVENLY - CONTINUED
Step 2..
Check valve adjustment (page 2-149).
a. If valves are properly adjusted, go to step 3.
b. If valves are not properly adjusted, adjust (page 2-149).
WARNING
No open flames, welding, grinding, smoking, or use of heat producing devices permitted near fuel tank
and fuel lines during maintenance unless the fuel tank has been cleaned and purged of all flammable
liquids and vapors. Fuel burns easily and fumes are explosive. Failure to observe these precautions
could cause serious injury.
Step 3.
Start and warm up engine (TM 5-2420-222-10). Have assistant operate engine at a speed which
produces maximum miss or irregularity. Using 9116-inch and 3/4-inch open-end wrenches,
unscrew tube (1) at fuel injection nozzle (2) part way until engine sound changes.
a. If engine sound does not change, fuel injection nozzle is defective. Shut down engine (TM 5-
2420-222-10) and replace fuel injection nozzle (page 2-201).
b. If engine sound changes, fuel injection nozzle is operating properly. Repeat step 3 for remaining
injection nozzles (3, 4, and 5) until engine sound does not change.
c. If all fuel injection nozzles are operating properly, notify Direct Support Maintenance.
6. ENGINE KNOCKS Go to Engine Malfunction 5: Engine Runs Unevenly, steps 2 and 3 (above).
7. ENGINE OIL PRESSURE LOW (INDICATOR LIGHT ON)
Step 1.
Pull liquid level gage (6) out of nipple or adapter (7) and check for diesel fuel in lubricating oil. Push
gage (6) into nipple or adapter (7) as far as it will go.
a. If diesel fuel is present in lubricating oil, go to Engine Malfunction 12: Engine Uses too Much Fuel
(More Than 2.5 Gallons (9.5 Liters) Per Hour) (page 2-54).
b. If diesel fuel is not present in lubricating oil, go to step 2.
2-48

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