Upper Engine Noise, Regardless of Engine Speed (LDK, LHU)
|
|
Upper Engine Noise, Regardless of Engine Speed (LDK, LHU)
|
|
Cause
|
Correction
|
Low oil pressure
|
|
2.
|
Repair or replace, as required.
|
|
Loose and/or worn valve rocker arm attachments
|
|
1.
|
Inspect the valve rocker arm stud, nut, or bolt.
|
|
2.
|
Repair or replace, as required.
|
|
Worn rocker arms
|
Replace the valve rocker arm.
|
Improper lubrication to the valve rocker arms
|
Inspect the following components and repair or replace as required:
|
•
|
The oil filter bypass valve
|
|
•
|
The oil pump and pump screen
|
|
•
|
The engine block oil galleries
|
|
Broken valve spring
|
Replace the valve spring.
|
Worn or dirty valve lifters
|
Replace the valve lifters.
|
Stretched or broken timing chain and/or damaged sprocket teeth
|
Replace the timing chain and sprockets.
|
Worn, damaged, or faulty timing chain tensioners
|
Replace the timing chain tensioners.
|
Worn camshaft lobes
|
|
1.
|
Inspect the engine camshaft lobes.
|
|
2.
|
Replace the camshaft and valve lifters as required.
|
|
Worn valve guides or valve stems
|
Inspect the following components and repair as required:
|
Stuck valves
Carbon on the valve stem or valve seat may cause the valve to stay open.
|
Inspect the following components and repair as required:
|
