T R O U B L E S H O O T I N G
TM 5-3805-258-24-1
T E S T I N G
A N D
A D J U S T I N G
14. LITTLE MOVEMENT OF ROCKER ARM AND TOO MUCH VALVE CLEARANCE
Cause
Too Much Valve Clearance
Not Enough Lubrication
Rocker Arm Worn at Face That
Makes Contact With Valve
End of Valve Stem Worn
Worn Push Rods
Valve Lifters Worn
Damage to Valve Lifters
Worn Cams on Camshaft
Correction
Make adjustment, See the Subject VALVE CLEARANCE in Test-
ing and Adjusting.
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.
If there is too much wear, install new rocker arms. Make adjustment
of valve clearance, See the Subject VALVE CLEARANCE in Test-
ing and Adjusting.
If there is too much wear, install new valves. Make adjustment of
valve clearance, See the Subject VALVE CLEARANCE in Testing
and Adjusting.
If there is too much wear, install new push rods. Make adjustment of
valve clearance, See the Subject VALVE CLEARANCE in Testing
and Adjusting.
If there is too much wear, install new valve lifters. Make adjustment
of valve clearance, See the Subject VALVE CLEARANCE in Test-
ing and Adjusting.
Install new valve lifters. Check camshaft for wear. Check for free
movement of valves or bent valve stem. Clean engine thoroughly.
Make adjustment of valve clearance, See the Subject VALVE
CLEARANCE in Testing and Adjusting.
Check valve clearance. Check for free movement of valves or bent
valve stems. Check for valve lifter wear. Install a new camshaft.
Make adjustment of valve clearance, See the Subject VALVE
CLEARANCE in Testing and Adjusting.
15. VALVE ROTOCOIL OR SPRING LOCK IS FREE
Cause
Correction
Damage to Locks
Locks with damage can cause the valve to fall into the cylinder. This
will cause much damage.
Damage to Valve Spring(s)
Install new valve spring(s).
16. OIL AT THE EXHAUST
Cause
Correction
Too Much Oil in the Valve Compart-
Look at both ends of the rocker arm shaft. Be sure that there is a plug
ment
in each end.
Worn valve Guides
Reconditioning of the cylinder head is needed.
Worn Piston Rings
Inspect and install new parts as needed.
Running Engine Too Long At Low
Don’t let the engine run for long periods of time at low idle.
Idle
4-89
