Valve Stem to Guide Clearance

Check the valve stem-to-valve guide clearance of each valve in its respective valve guide with Dial Indicator with Bracketry 100-002 and Valve Stem Clearance Tool 303-004 or equivalent. Use a flat-end indicator point.

Install the tool on the valve stem until it is fully seated and firmly tighten the knurled setscrew. Permit the valve to drop away from its seat until the tool contacts the upper surface of the valve guide.





Position Rotunda Dial Indicator with Bracketry 100-002 or equivalent with its flat tip against the center portion of the tool's spherical section at approximately 90 degrees to the valve stem axis. Move the tool back and forth in line with the indicator stem. Take a reading on the dial indicator without removing the tool from the valve guide upper surface. Divide the reading by two, which is the division factor for the tool. If valve stem-to-valve guide clearance exceeds the wear limit, ream the valve guide for the next oversize valve stem.