Valve Guide: Testing and Inspection

INNER DIAMETER

Measure the inner diameter of the valve guides in two directions where indicated. Verify the diameter is within specification.
Inner Diameter 8.063-8.094 mm (0.3174-0.3187 inch).

VALVE STEM-TO-VALVE GUIDE CLEARANCE





Check the valve stem-to-valve guide clearance of each valve in its respective valve guide with Valve Stem Clearance Tool TOOL-6505-E and Dial Indicator with Bracketry TOOL-4201-C or equivalent. Use a flat-end indicator point.

PROCEDURES
1. Install the tool on the valve stem until the lip is fully seated, and tighten the knurled set screw firmly.
2. Permit the valve to drop away from its seat until the tool contacts the upper surface of the valve guide.
3. Position and zero the dial indicator on the cylinder head.
4. Move the valve back and forth 90 degrees from the dial indicator shaft.
5. Divide the measurement by two to determine the actual guide clearance.
^ The intake clearance is 0.020-0.069 mm (0.0008-0.0027 inch).
^ The exhaust clearance is 0.046-0.095 mm (0.0018-0.0037 inch).
6. If the clearance exceeds specification, replace the valve and/or valve guide.