Troubleshooting

RENR2696-01 53
Troubleshooting Section
Valve Lash
Adjust the valve lash of the engine. Refer to Testing
and Adjusting, “Air Intake and Exhaust System” for
the correct p r
ocedure.
Valve Train Components
1. Inspect the following components of the valve
train:
•
Rocker arms
•
Pushrods
•
Valve lifters
•
Camshaft
•
Valve stems
•
Rocker shafts
2. Check the components for the following
conditions: abnormal wear, excessive wear,
straightnes
s, and cleanliness. If necessary, use
new parts for replacement.
Note: If the c
amshaft is replaced, new valve lifters
must also be used.
3. Adjust the va
lve lash of the engine. Refer to
Testing and Adjusting, “Engine Valve Lash -
Inspect/Adjust” for the correct procedure.
i01798130
Excessive White Smoke
Note: Some white smoke may be present during
cold start-up conditions when the engine is operating
normally.Ifthewhitesmokepersists,theremaybe
a problem.
Probable Causes
•
Fuel supply
•
Individual malfunctioning cylinder
•
Valve lash
•
Low compression (cylinder pressure)
•
Air inlet heater starting aid
•
Fuel injection nozzles
•
Coolant temperature sensor circuit
•
Engine pressure sensors
Recommended Actions
Fuel Supply
1. Check the fuel p
ressure. Re fer to Systems
Operation, Testing and Adjusting, “Fuel System
Pressure - Test”.
2. Ensure that the fuel system has been primed.
Refer to Systems Operation, Testing and
Adjusting, “F
uel System - Prime”.
3. Check the diesel fuel for contamination. Refer to
Systems Oper
ation, Testing and Adjusting, “Fuel
Quality - Test”.
4. Check for air
in the fuel system. Refer to Systems
Operation, Testing and Adjusting, “Air in Fuel -
Te s t ” .
5. Check that the fuel lines are tight and secured
properly.
6. Check for fuel supply lines that are restricted.
7. Check the fu
el filters.
8. Visually check the fuel tank for fuel. The fuel
gauge may be
faulty.
9. If the engine has a water separator, check for
water in the
fuel.
10. Ensure that the fuel supply valve (if equipped) is
in the full O
PEN position.
11. If the temperature is below 0 °C (32 °F), check
for solidi
fied fuel (wax).
Individual Malfunctioning Cylinder
1. With the engine speed at a fast idle, loosen the
high pressure fuel line to the fuel injection nozzle
of number 1
cylinder. Note if there is any reduction
in engine speed. Tighten the high pressure fuel
line to the fuel injection nozzle.
2. Individually repeat this procedure for each fuel
injection nozzle.
3. If there is no reduction in the engine speed
proceed to “Fuel Injection Nozzles”.
4. If there is a reduction in engine speed proceed to
“Valve Lash”.