KENR6933 51
Troubleshooting Section
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 ne
cessary 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 engi
ne 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 r
eduction 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 below normal performance. 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
performan
ce.
2. Rectify any faults.
3. If all cylinders have been checked and no
problems were detected proceed to “Electronic
Unit Inje
ctors”.
Electronic Unit Injectors
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 electronic unit injector 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 elec
tronic unit injector is operating below
normal performance.
2. Remove the el
ectronic unit injector from the
suspect cylinder. Refer to Disassembly and
Assembly, “Electronic Unit Injector - Remove”.
3. Install a new electronic unit injector. Refer to
Disassembly and Assembly, “Electronic Unit
Injector - I
nstall”.
4. Repeat the test in 1. If the fault is still apparent,
remove the
replacement electronic unit injector
and install the original electronic unit injector.
Refer to Disassembly and Assembly, “Electronic
Unit Injec
tor - Remove” and Disassembly and
Assembly, “Electronic Unit Injector - Install”.
5. If the faul
t is not eliminated, check for active
diagnostic fault codes.
i02413836
Engine Oil in Cooling System
Note: This is not an electronic system problem.
Probable Causes
•
Engine oil cooler
•
Cylinder head gasket
•
Cylinder head
•
Cylinder block
Recommended Actions
Engine Oil Cooler
1. Drain the coolant from the engine and the radiator.
Drain the lubricating oil from the engine oil cooler.
Refer to the Operation and Maintenance Manual
for more information.
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