Troubleshooting

(Table 59, contd)
Troubleshooting Test Steps
Values Results
10. Engine Oil Suction Tube
A. Check the inlet screen on the oil suction tube and remove
any material that may be restricting oil flow.
B. Check the joints of the oil suction tube for cracks or a dam-
aged joint.
Note: Cracks or damage may allow air leakage into the sup-
ply to the oil pump.
Oil suction tube Result: The inlet screen on the oil suction tube is blocked with
debris.
Repair: Remove the debris from the inlet screen.
Result: The oil suction tube is cracked.
Repair: Install a new oil suction tube.
Result: The oil suction tube is OK.
Proceed to Test Step 11.
11. Engine Oil Pump
A. Inspect the components of the engine oil pump for exces-
sive wear.
Oil pump Result: A component in the oil pump is not within
specification.
Repair: Repair the oil pump or replace the oil pump, if neces-
sary. Refer to Disassembly and Assembly, “Engine Oil Pump -
Remove” and Disassembly and Assembly, “Engine Oil Pump -
Install”.
Result: The oil pump is OK.
Proceed to Test Step 12.
12. Bearing Clearance
A. Inspect the engine components for excessive bearing
clearance or damaged bearings. Inspect the following compo-
nents for excessive bearing clearance:
· Crankshaft main bearings
· Connecting rod bearings
· Camshaft front bearing
· Idler gear bearing
Bearing
clearance
Result: An engine bearing is not within specification.
Repair: Install a new bearing. Refer to Disassembly and
Assembly.
Result: All engine bearings are within specification.
Repair: If the fault is still present there may be an open circuit
condition in the oil pressure switch circuit. Refer to Trouble-
shooting, “Switch Circuits - Test (Engine Oil Pressure
Switch)”.
i06226122
Power Is Intermittently Low or
Power Cutout Is Intermittent
Note: Use this procedure only if the engine does not
shut down completely.
Probable Causes
• Diagnostic codes
• Electrical connectors
• ECM connection
• Fuel system inspection
• Air inlet and exhaust system
Recommended Actions
NOTICE
Do not crank the engine continuously for more than
30 seconds. Allow the starting motor to cool for two
minutes before cranking the engine again.
Note: The procedures have been listed in order of
probability. Complete the procedures in order.
120 UENR0612-07
Symptom Troubleshooting
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