Valve Stem Installed Height

To measure valve stem height, place suitable tool (BT-6428 or J-25289) over installed valve stem and measure clearance between gauge and stem. Clearance should be at least 0.015". Grind tip of valve stem if clearance is less than specified. With valve keys installed on valves, tap all valve stem ends with a hammer to seat valve retainers (or rotators) and keys. Remeasure clearance between valve retainer (or rotator) and gauge. If any valve stem end is less than 0.005" above rotator or 0.030" above retainer, valve is too short and must be replaced.