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 Troubleshooting
13. Valve train noise
Cause
Correction
Broken valve spring(s) or locks.
Install new parts where necessary. Broken locks
can cause the valve to slide into the cylinder.
This will cause much damage.
Not enough lubrication.
Check lubrication in valve compartment. There
must be a strong flow of oil at engine high rpm,
but only a small flow of oil at low rpm.
Oil passages must be clean, especially those
sending oil to the cylinder head.
Damage in bridge for valves.
Make a replacement of the bridge and make an
adjustment as necessary.
Too much valve clearance.
Make correct adjustment.
14. Loud valve train noise
Cause
Correction
Broken valve spring(s).
Make replacement of damaged parts.
Broken camshaft.
Make replacement of damaged parts. Clean
engine thoroughly.
15. Too much valve lash
Cause
Correction
Not enough lubrication.
Check lubrication in valve compartment. There
must be a strong flow of oil at engine high rpm,
but only a small flow at low rpm.
Oil passages must be clean, especially those
sending oil to the cylinder head.
Rocker arm worn at face that makes
If there is too much wear, install new parts
contact with bridge.
or rocker arms. Make adjustment of valve
clearance.
End of valve stem worn.
If there is too much wear, install new valves.
Make adjustment of valve clearance.
Worn push rods.
If there is too much wear, install new push rods.
Make adjustment of valve clearance.
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