(Table 71, contd)
Troubleshooting Test Steps
Values Results
5. Lubrication
A. Check for sufficient lubrication of the valve components.
B. Check for blocked oil passages. Oil passages must be clean.
Clean any oil passages that are suspect. Refer to the Disassembly
and Assembly for additional information.
C. Inspect the engine oil filters for ferrous material.
D. Obtain an oil analysis.
Note: The analysis will contribute to a better understanding of oil
contamination and the origin of the contamination.
Lubrication Result: The oil passages are not blocked and the engine
has sufficient lubrication.
Proceed to Test Step 6.
Result: The oil passages are blocked or the engine does
not have sufficient lubrication.
Repair: Make the necessary repairs, Verify that the repair
eliminated the fault.
6. Engine Accessory
A. If the source of the noise is an engine accessory, remove and
inspect the suspect item.
Engine
accessory
Result An engine accessory is the source of the noise.
Repair: Repair and/or replace the engine accessory, if
necessary.
Result An engine accessory is not the source of the noise.
Proceed to Test Step 7.
7. Valve Train Components
A. Check the valve lash. Refer to Troubleshooting, “Valve Lash Is
Excessive”.
B. Check for damage to valve train components. Remove the
valve cover from the suspect cylinders. Check the following items
for damage:
· Camshaft
· Valve springs
· Camshaft followers
· Rocker shaft
· Valve bridges
· Pushrods
· Injectors
Refer to Disassembly and Assembly for additional information.
C. Check for valves that do not move freely. Remove the cylinder
head and inspect the valves.
Refer to Disassembly and Assembly for additional information.
Valve train Result: The valve train components are not damaged.
Proceed to Test Step 8.
Result: The valve train components are damaged.
Repair: Make the necessary repairs, Verify that the repair
eliminated the fault.
(continued)
146 UENR4469-36
Symptom Troubleshooting
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