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TM 5-2420-222-34
Table 2-1. Troubleshooting (Con’t).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2.
If black smoke is present, check to see if fuel injection nozzles are dirty, clogged, or sticking, or if
fuel metering pump is defective.
Test, clean, and repair fuel injection nozzles (see paragraph 5-1).
Replace fuel metering pump (see paragraph 5-2).
Step 3.
Perform engine assembly compression test (see paragraph 3-1).
Repair as required.
4.
ENGINE OIL PRESSURE TOO LOW.
Step 1.
Check engine oil pump cover and seal for damage.
Replace as required (see paragraph 3-21).
Step 2.
Check engine oil pump for damage or wear.
Repair or replace engine oil pump (see paragraph 3-21).
5.
ENGINE SPEED IS ERRATIC.
Start engine assembly to see if fuel metering pump is working properly (see TM 5-2420-222-10).
Replace fuel metering pump (see paragraph 5-2).
6.
ENGINE NOISY.
Step 1.
Check engine timing (see paragraph 3-16).
Set engine timing (see paragraph 3-16).
Step 2.
Start engine assembly and operate at idle speed (see TM 5-2420-222-10). Listen for noise at
flywheel housing.
If noise is heard, increase engine speed. If noise goes away when engine speed increases,
flywheel is loose. Tighten flywheel mounting hardware (see paragraph 3-10).
Step 3.
Start engine assembly and operate at idle speed (see TM 5-2420-222-10). Listen for noise in
cylinder block in line with crankshaft.
If noise is heard, increase engine speed. If noise gets louder and engine vibration Increases as
engine rpm increases, main crankshaft bearings are worn. Replace main crankshaft bearings (see
paragraph 3-8).
If noise Is heard, increase engine speed. If noise gets louder as engine rpm increases but engine
vibration does not increase, connecting rod sleeve bearing is worn. Replace connecting rod sleeve
bearing (see paragraph 3-11).
If noise is heard, increase engine speed. If noise does not get louder as engine rpm in- creases, a
camshaft bushing is worn. Replace camshaft bushings (see paragraph 3-17). If noise is heard,
when Increasing and decreasing engine speed, there may be too much lateral movement in
crankshaft. A change in engine rpm pushes crankshaft in one direction, then in opposite direction.
Adjust crankshaft end play (see paragraph 3-8).
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