(Table 32, contd)
Troubleshooting Test Steps
Values
Results
8. Low Compression (Cylinder Pressure)
A. Perform a compression test. Refer to Systems Operation,
Testing, and Adjusting, “Compression - Test”.
Low
compression
Result:
Low compression is recorded on one or more
cylinders.
Possible causes of low compression are shown in the following
list:
·
Loose glow plugs
·
Faulty piston
·
Faulty piston rings
·
Worn cylinder bores
·
Worn valves
·
Faulty cylinder head gasket
·
Damaged cylinder head
Make any repairs, as necessary.
Result:
No faults found.
Proceed to Test Step 9.
9. Individual Malfunctioning Cylinders
A. With the engine speed at a fast idle, use the electronic serv-
ice tool to perform the manual
“
Cylinder Cut Out Test
”
. As
each cylinder is cut out, listen for a change in the sound from
the engine. When a cylinder is cut out, there should be a no-
ticeable change in the sound of the engine.
Cylinders
Result:
There is not a noticeable change in the sound of the
engine for at least one cylinder.
Investigate the cause of the fault on any cylinder that is not op-
erating. Investigate the cause of the fault on any cylinder that
is operating below normal performance.
Result:
There is a noticeable change in the sound of the en-
gine for each cylinder.
Contact the Dealer Solution Network (DSN).
i05955206
Engine Vibration Is Excessive
Refer to Systems Operation, Testing, and Adjusting
for additional information on determining the cause of
this condition.
Probable Causes
• Engine supports
• Driven equipment
• Low compression (cylinder pressure)
• Electronic unit injectors
• Individual malfunctioning cylinder
Recommended Actions
Note:
Complete the procedure in the order in which
the steps are listed.
UENR0612
77
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