Table 5-4. Troubleshooting - Continued
TROUBLE
PROBABLE CAUSE
REMEDY
2. Engine is hard to turn
3. Engine exhaust restricted
3. Inspect engine exhaust system
If ex-
(Continued)
haust system is not restricted, proceed
to probable cause 4.
4. Poor electrical connections or bad
4. Clean connections and tighten as
starter
necessary.
5. Engine exhaust valve/s stuck closed 5. Examine valve/s and valve seat/s.
If valves are not sticking, proceed to
probable cause 6.
6. Injector/s leaking into cylinder/s
6. Refer to REPAIR (Section V) and
causing hydraulic lockup.
perform fuel injector leak test. If in-
jector/s is/are not leaking, proceed to
probable cause 7.
7. Piston/s seizing on cylinder wall/s.
7. Refer to REPAIR (Section V) and ex-
amine pistons and cylinders for
evidence of seizing. Replace all
defective parts.
3. Black smoke coming from
1. Air filter clogged
1. Refer to INSPECTION AND PRE-
exhaust
VENTIVE MAINTENANCE (Section
V) and service filter. If air filter is not
clogged, refer to probable cause 2.
2. Clogged engine fuel injector nozzle
2. Refer to INSPECTION AND PRE-
VENTIVE MAINTENANCE (Section
V) and replace fuel injector nozzle/s.
If nozzle/s is/are clogged, refer to
probable cause 3.
3. Tappet clearance incorrect
3. Refer to INSPECTION AND PRE-
VENTIVE MAINTENANCE (Section
V), check and adjust tappet clearance.
If tappet clearance is correct, refer to
probable cause 4.
4. Injector/s not tightened to proper
4. Refer to Table 5-6 and check injector
torque value.
retaining nuts torque value. If torque
value is correct, proceed to probable
cause 5.
5. Dirty injector/s
5. Refer to REPAIR (Section V) and clean
injector/s. If injector/s are clean, pro-
ceed to probable cause 6.
6. Worn engine intake and/or exhaust
6.Examine valves and valve seat/s for
vidence of wear. Replace all defective
parts.
7. Collapse or kinked air intake hose
7. Replace hose.
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