OHC Engine Valves
several different methods of adjusting the valves on an overhead cam (OHC) engine. Many
are adjusted like mechanical lifters in a pushrod engine.
The rocker arm
adjuster is turned until the correct size feeler gauge fits between the rocker or cam lobe
and the valve stem.
adjusting shims may also be used on OHC engines for the cam-to-valve clearance. To
determine whether shims are required, measure the valve clearance with a feeler gauge.
Then, if needed remove or change the shim thickness as necessary.
engines have an Allen adjusting screw in the cam followers. Turning the screw changes the
valve clearance. Always refer to the manufacturers manual for detailed instructions.