Sound that is often heard in all engine speed ranges
Probable cause
Large valve
clearance and
contact defect
Valve sticking sound
Exhaust leak
Compression leak
Example of
sound
Notes
While the engine is running, check the valve clearance by
inserting a thickness gauge of the standard clearance
If the clearance is larger than the standard, adjust to the
standard by tightening the adjusting screw on the top of the
rocker arm
Check by placing a sound scope on the valve
The sound gets smaller or stops when engine oil or a noise
damper solution is applied with compressed air
Check by blocking with a wet cloth the likely location of the leak
in the exhaust system
When the engine speed is increased, the sound gets louder
Stop the nozzle injection and check
After it is stopped, the sound gets smaller or stops
Check by coating with oil the installation areas of the cylinder
head gasket and the injection nozzle glow plug gasket
The oil will bubble out if there is a leak
If a gasket is damaged the combustion gas could leak into the
cooling system, generating bubbles at the top of the radiator
To Next Page
Loading...
Need help?
General
