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TM 5-2420-222-34
Table 2-1. Troubleshooting (Con’t).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2.
Check engine timing (see paragraph 3-16).
Set engine timing (see paragraph 3-16).
If engine timing Is okay, remove cylinder head (see paragraph 3-6) and check cylinder head gasket.
If cylinder head gasket is okay, replace valves (see paragraph 3-12).
Step 3.
Remove timing gear cover (see paragraph 3-18). Check fuel metering pump drive gear-to-idler
gear backlash (see paragraph 3-19).
Adjust fuel metering pump drive gear-to-idler gear backlash (see paragraph 3-19).
Step 4.
Remove cylinder head (see paragraph 3-6). Check for a scored cylinder sleeve. Crank engine until
piston in cylinder being checked is at bottom of cylinder. Visually check cylinder sleeve. Repeat for
all four cylinders.
Replace cylinder sleeves (see paragraph 3-5).
Step 5.
Remove timing gear cover (see paragraph 3-18). Check crankshaft end play (see paragraph 3-8).
Adjust crankshaft end play (see paragraph 3-8).
Step 6.
Check end clearance of idler gear (see paragraph 3-15).
Adjust idler gear end play (see paragraph 3-15).
9.
ENGINE USES TOO MUCH OIL.
Step 1.
Perform engine assembly compression test (see paragraph 3-1).
Put a small amount of oil In cylinder and repeat engine compression test (see paragraph 3-1).
If compression test readings are now normal, replace piston rings (see paragraph 3-11).
Step 2.
Remove cylinder head (see paragraph 3-6). Check cylinder head gasket for damage.
If cylinder head gasket Is damaged, replace cylinder head gasket and Install cylinder head (see
paragraph 3-6).
If cylinder head gasket is okay, check cylinder sleeves for out-of-round condition (see paragraph
3-5) or piston rings for incorrect installation (see paragraph 3-11).
Step 3.
Check rocker arm compartment for signs of too much oil.
If rocker arms compartment has signs of too much oil, problem is clogged oil return holes. Use a
thin wire probe and try to clear obstruction from oil return hole.
Step 4.
Remove and disassemble rocker arm assemblies (see paragraph 3-13). Check inside diameter of
rocker arms.
Replace rocker arm if defective (see paragraph 3-13).
Step 5.
Measure outside diameter of rocker arm shafts (see paragraph 3-13).
Replace rocker arm shaft if defective (see paragraph 3-13).
2-6
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