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Upper Engine Noise, Regardless of Engine Speed

Upper Engine Noise, Regardless of Engine Speed


Cause Correction
Low oil pressure
1. Perform an oil pressure test. Refer to Oil Pressure Diagnosis and Testing .

2. Repair or replace as required.


Loose and/or worn follower, valve rocker arm
1. Inspect the follower, valve rocker arm.

2. Repair or replace as required.


Improper lubrication to the followers, valve rocker arms Inspect the following components, and repair or replace as required:
The follower, valve rocker arm

The SHLA, valve lifter

The oil filter bypass valve

The oil pump and pump screen

The cylinder head oil galleries

The engine block oil galleries


Broken valve spring Replace the valve spring.
Worn or dirty stationary hydraulic lash adjusters (SHLAs), valve lifters Replace the SHLAs, valve lifters.
Stretched or broken timing chain or chains and/or damaged sprocket teeth Replace the timing chain or chains and sprockets.
Worn timing chain tensioner or tensioners Replace the timing chain tensioner or tensioners as required.
Worn timing chain shoe or shoes Replace the timing chain shoe or shoes as required.
Worn timing chain guide or guides Replace the timing chain guide or guides as required.
Worn engine camshaft lobes
1. Inspect the engine camshaft lobes.

2. Replace the camshaft or camshafts and SHLAs, valve lifters, as required.


Worn valve guides or valve stems Inspect the following components, and repair as required:
The valves

The valve guides



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:
The valves

The valve guides