(Table 88, contd)
Troubleshooting Test Steps
Values Results
9. Low Compression (Cylinder Pressure)
A. Perform a compression test. Refer to Systems Operation, Test-
ing, 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
Proceed to Test Step 12.
Result: The results of the compression test are OK.
Proceed to Test Step 10.
10. 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 9
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 Disassem-
bly and Assembly, “Electronic Unit Injector - Install”.
Repeat the automatic “Cylinder Cut Out Test” . If the
fault is still apparent, remove the replacement elec-
tronic unit injector and install the original electronic unit
injector. Refer to Disassembly and Assembly, “Elec-
tronic Unit Injector - Remove” and Disassembly and
Assembly, “Electronic Unit Injector - Install”.
Proceed to Test Step 12.
Result: All injectors are OK.
Proceed to Test Step 11.
(continued)
178 UENR4469-36
Symptom Troubleshooting
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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