SAAB WIS ONLINE

Upper Engine Noise, Regardless of Engine Speed

Upper Engine Noise, Regardless of Engine Speed


Cause Correction
Low oil pressure


Perform an oil pressure test. Refer to Oil Pressure Diagnosis and Testing .

Repair or replace as required.


Loose and/or worn valve rocker arm attachments


Inspect the valve rocker arm stud, nut, or bolt.

Repair or replace as required.


Worn or damaged valve rocker arm

Repair or replace as required.

Improper lubrication to the valve rocker arms

Inspect the following components and repair or replace, as required:


The valve rocker arm

The valve lifter

The oil filter bypass valve

The oil pump and pump screen

The engine block oil galleries


Broken valve spring

Replace the valve spring.

Excessive valve lash


Inspect valve lash adjusters.

Replace if damaged.


Bent valve pushrod


Inspect valve pushrod and valve rocker arm.

Repair or replace as required.


Worn or dirty valve lash adjusters

Replace the valve lash adjusters.

Stretched or broken timing chain and/or damaged sprocket teeth

Replace the timing chain and sprockets.

Worn, damaged, or faulty timing chain tensioners

Replace tensioners

Worn camshaft lobes


Inspect the engine camshaft lobes.

Replace the camshaft and valve lash adjusters 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


Damaged or misaligned timing gears


Inspect timing gears.

Replace all damaged components.