KENR6933 41
Troubleshooting Section
9. Ensure that the fuel system has been primed.
Refer to Testin
g and Adjusting, “Fuel System -
Prime”.
10. Check the fuel
pressure. Refer to Testing and
Adjusting, “Fuel System Pressure - Test”.
Contact w ith high pressure f uel may cause fluid
penetration
and burn hazards. High pressure fu-
el spray may cause a fire hazard. Failure to fol-
low these inspection, maintenance a nd service in-
structions m
ay cause personal injury or death.
NOTICE
Contact with high pressure fuel may cause personal
injury or death. Wait 60 seconds after the engine has
stopped to allow fuel pressure to purge before any
service or repair is performed on the engine fuel lines.
11. If the high pressure fuel lines have a leak, the
high pressure fuel lines must be replaced. Refer to
Disassembly and Assembly, “Fuel injection lines -
Remove and Fuel injection lines - Install”.
12. If the repairs do not eliminate the fault, proceed to
“Low Compression (Cylinde r Pressure)”.
Low Compression (Cylinder Pressure)
1. Perform a compression test. Refer to Testing and
Adjusting, “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 piston
•
Faulty piston rings
•
Worn cylinder bores
•
Worn valves
•
Faulty cylinder head gasket
•
Damaged cylinder head
3. Perform 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 Cylinders”.
Individual Malfunctioning Cylinders
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
speed. 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
results in a reduction of engine speed that is less
than normal, this may indicate that the cylinder is
operating be
low normal performance. Investigate
the cause of the fault on any cylinder that is
not operating. Investigate the cause of the fault
on any cylin
der that is operating below normal
performance.
2. If all cylin
ders have been checked and no
faults were detected proceed to “Electronic Unit
Injectors”.
Electronic Unit Injectors
1. With the en
gine 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
speed. If a
reduction in engine speed is not noted,
the isolated electronic unit injector is not operating
under normal conditions. If the isolation of a
particul
ar cylinder results in a reduction of engine
speed that is less than normal, this may indicate
that the electronic unit injector is operating below
normal pe
rformance.
2. Remove the electronic unit injector from the
suspect c
ylinder. Refer to Disassembly and
Assembly, “Electronic Unit Injector - Remove”.
3. Install
a new electronic unit injector. Refer to
Disassembly and Assembly, “Electronic Unit
Injector - Install”.
4. Repeat the test in 1. If the fault is still apparent,
remove the replacement electronic unit injector
and inst
all the original electronic unit injector.
Refer to Disassembly and Assembly, “Electronic
Unit Injector - Remove” and Disassembly and
Assemb
ly, “Electronic Unit Injector - Install”.
i02528174
Coolant in Eng ine Oil
Note: This is not an electronic system problem.
Probable Causes
•
Engine oil cooler
•
Cylinder head gasket
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