Valve Seats
- Service valve guide before valve seat. Valve seat replacement information is not available. Inspect valve seat for roughness and damage. Check valve seat angle and seat width.
- Measure seat contact width on valve, and note that seat contact position should be in center of valve face. Service seat if angle and width are not within specification. See CYLINDER HEAD under ENGINE SPECIFICATIONS. Measure valve installed height after servicing valve seat. See Figure. See VALVE INSTALLED HEIGHTS .
- If valve installed height is within serviceable range, install adjusting shim on spring seat. If installed height exceeds serviceable range, replace cylinder head.
VALVE INSTALLED HEIGHTS
| Application | In. (mm) |
|---|---|
| Normal | 1.518-1.553 (38.56-39.45) |
| Serviceable | 1.555-1.594 (39.50-40-49) |