(Table 14, contd)
Troubleshooting Test Steps Values Results
12. Low Compression (Cylinder Pressure)
A. Perform a compression test. Refer to Systems Operation,
Testing, and Adjusting, “Compression - Test ”.
Cylinder
compression
Result: The results of the compression test are outside
the specifications.
Repair: Investigate the cause and rectify any faults.
Note: 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
Result: The results of the compression test are OK.
Proceed to Test Step 13.
13. Electronic Unit Injectors
A. Use the electronic service tool to perform the automatic “Cylin-
der Cut Out Test” .
Note: If the compression test that was performed in Test Step 12
was satisfactory, the “Cylinder Cut Out Test” will identify any faulty
injectors.
Electronic Unit
Injectors
Result: A faulty injector is indicated.
Repair: Remove any faulty electronic unit injectors. Refer
to Disassembly and Assembly, “Electronic Unit Injector -
Remove”.
Install new electronic unit injectors. Refer to Disassembly
and Assembly, “Electronic Unit Injector - Install”.
Repeat the automatic “Cylinder Cut Out Test” . If the fault
is still apparent, remove the replacement electronic unit in-
jector and install the original electronic unit injector. Refer
to Disassembly and Assembly, “Electronic Unit Injector -
Remove” and Disassembly and Assembly, “Electronic Unit
Injector - Install”.
Result: All injectors are OK.
Proceed to Test Step 14.
14. Individual Malfunctioning Cylinders
A. With the engine speed at a fast idle, use the electronic service
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 notice-
able change in the sound of the engine.
If a change in the sound of the engine is not noted, the isolated
cylinder is not operating under normal conditions. If the isolation
of a cylinder results in a change in the sound that is less notice-
able, the cylinder may be operating below normal performance.
Cylinders Result: The test indicates a faulty cylinder.
Repair: 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 below normal performance.
Result: The test indicates that all cylinders are OK.
Contact the Dealer Solutions Network (DSN).
72 UENR4469-36
Symptom Troubleshooting
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
To Next Page
Loading...
