TM 9-2330-381-14
4-13.
TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
APU - CONT
4.
WHITE OR BLUE EXHAUST SMOKE IS OBSERVED AFTER WARMUP
Step 1.
Inspect oil dipstick for excessive engine oil in crankcase.
Drain oil to correct level (para. 4-100). Check oil for odor
of fuel. If fuel odor is found, notify DS maintenance.
Step 2.
Check for low compression by listening for compression leaks.
a. Check glow plug for looseness. Tighten or replace as
necessary (para. 4-97).
b. Visually check for cracks and listen for leaks around
cylinder head. Notify DS maintenance if a leak is found.
c.
Visually check for cracks and listen for leaks around
engine block. If any defects are found, or if above steps
do not correct malfunction, notify DS maintenance.
5.
BLACK OR DARK GRAY EXHAUST SMOKE IS OBSERVED AFTER WARMUP
Step 1.
Visually check for contaminated or discolored fuel.
Drain and flush tank. Replace fuel filter and refill fuel tank
with proper grade of fuel (para. 3-3).
Step 2.
Check for blockage in fuel lines.
Remove fuel lines and check for blockage. Clear blockage or
replace fuel lines (para. 4-104).
Step 3.
Check for contaminated fuel filter or clogged filter block.
Disassemble fuel filter and filter block and check for
blockage. If blocked, clear passages, replace fuel filter, and
reinstall fuel filter and filter block (para. 4-105).
6.
INSUFFICIENT ENGINE OUTPUT "LOW POWER"
Step 1.
Check for contaminated fuel filter or clogged filter block.
Disassemble fuel filter and filter block and check for
blockage. If blocked, clear passages, replace fuel filter, and
reinstall fuel filter and filter block (para. 4-105).
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