58 KENR9126
Troubleshooting Section
i04010464
Excessive W h ite S moke
Note: Some white smoke may be present during
cold start-up
conditions when the engine is operating
normally.Ifthewhitesmokepersists,theremaybea
fault.
Probable Causes
•
Coolant temperature sensor circuit
•
Low coolant
temperature
•
Glow plugs
•
Fuel quality
•
Valve las
h
•
Low compression (cylinder pressure)
•
Individual malfunct ioning cylinder
Recommended Actions
Coolant
Temperature Sensor Circuit
1. Connect the electronic service tool to the
diagno
stic connector.
2. Monitor the display screen on the electronic
servi
ce tool in order to verify the presence of active
diagnostic codes for the coolant temperature.
Refer to Troubleshooting, “Engine Temperature
Senso
r Open or Short Circuit - Test”.
3. If the fault has not been eliminated, proceed to
“Low C
oolant Temperature”.
Low Coolant Temperature
Check that the water temperature regulator is
operating correctly.
If the water temperature regulator is operating
correctly, refer to “Glow Plugs”.
Glow Plugs
1. Ch
eck for proper operation of the glow plugs.
2. If the repairs do not eliminate the fault refer to
“F
uel Quality”.
Fuel Quality
1. Check the diesel fuel for quality.
Note: Diesel fuel with a low cetane value is likely to
cause white smo
ke.
2. If the repair does not eliminate the fault refer to
“Valve Lash”.
Valve Lash
1. Ensure that the valve lash is correct.
2. If the repai
r does not eliminate the fault proceed to
“Low Compression (cylinder pressure)”.
Low Compres
sion ( cylinder pressure)
1. Perform a compression test.
2. If low compression is noted on any cylinders,
investigate the cause and rectify the cause.
Possible causes of low compression are shown
in the following list:
•
Loose glow plugs
•
Faulty p
iston
•
Faulty piston rings
•
Worn cylinder bores
•
Worn va
lves
•
Faulty cylinder head gasket
•
Damaged cylinder head
3. Perfo
rm all necessary repairs.
4. Ensure that the repairs have eliminated the faults.
5. If the repair does not eliminate the fault refer to
“Individual Malfunctioning Cylinder”.
Individual Malfunctioning Cylinder
1. With
the engine speed at a fast idle, use the
electronic service tool to isolate one cylinder at
a time. Note if there is any reduction in engine
spe
ed. If a reduction in engine speed is not noted,
the isolated cylinder is not operating under normal
conditions. If the isolation of a particular cylinder
res
ults in a reduction of engine speed that is less
than normal. The reduction in engine speed may
indicate that the cylinder is operating below normal
pe
rformance. Investigate the cause of the fault on
any cylinder that is not operating. Investigate the
cause of the fault on any cylinder that is operating
be
low normal performance.
2. Rectify any faults.
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