: Rotate the engine manually to Top Dead Center (TDC) for the cylinder you are adjusting. This ensures the valves are fully closed and the tappet is on the base circle of the cam lobe.
: Insert a feeler gauge between the tappet and the valve stem (or rocker arm). The gauge should have a "slight drag" when pulled through. Adjust : Loosen the lock nut using a spanner. Tapeet Mootor
: Remove the valve (rocker) cover. Always check your specific engine's service manual for the correct clearance specifications. : Rotate the engine manually to Top Dead
Turn the adjuster screw with a screwdriver until the correct clearance is reached. The gauge should have a "slight drag" when pulled through
A is the sleeve or housing that keeps the tappet moving in a perfectly straight line. DOC HARLEY: TAPPET GUIDE ALIGNMENT TOOL USES
: Always measure the clearance again after tightening the lock nut to ensure accuracy. Tappet Guides
Adjusting tappets, also known as setting valve clearance or lash, is vital for maintaining engine performance and preventing damage like burnt valves or rough idling.