ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
TEST OR INSPECTION
11. ENGINE KNOCKS.
Diesel fuel burns easily. Do not smoke or allow flames nearby. Disconnect batteries when
working on fuel system. Failure to observe these precautions could cause serious injury to
Check fuel tanks (1) for water in diesel fuel.
If water is present, drain fuel system and refill, (page 2-514).
If no water is present, go to step 2.
Check fuel suction lines from fuel tanks (1) to fuel pump (2) for air leaks caused by holes, dents, cracks, or
breaks; and loose connections due to stripped or damaged threads.
If fuel suction lines are leaking, notify Direct Support Maintenance.
If fuel suction lines are not leaking, go to step 3.
Check engine WATER TEMP gage (3).
If WATER TEMP gage (3) reads below 1650F, go to Malfunction 5, ENGINE DOES NOT REACH
OPERATING TEMPERATURE, 165°F (740C) (page 2-108).
If WATER TEMP gage (3) reads above 1950F, notify Direct Support Maintenance.
12. ENGINE OIL LEVEL ABOVE FULL MARK.
Go to Malfunction 10, ENGINE USES TOO MUCH FUEL, step 3 (page 2-112).
13. ENGINE USES TOO MUCH OIL.
Remove engine oil breather (TM 5-3805-254-10) and check for clogged or damaged condition.
If engine oil breather is clogged or damaged, clean or replace (TM 5-3805-254-10).
If engine oil breather is not clogged or damaged, go to step 2.