Cylinder Head

CLEANING
Clean cylinder head and oil passages using a suitable solvent.

INSPECTION
CYLINDER HEAD





Fig. 120

Check cylinder head for flatness (Fig. 120).
Cylinder head must be flat within:
- Standard dimension: less than 0.03 mm (0.0012 inch)
- Service Limit: 0.2 mm (0.008 inch)
- Grinding Limit: Maximum of 0.2 mm (0.008 inch) is permitted.

CAUTION: This is a combined total dimension of stock removal from cylinder head if any and block top surface is 0.2 mm (0.0079 inch).

VALVE GUIDES
Remove carbon and varnish deposits from inside of valve guides with a reliable guide cleaner.





Fig. 121

Using a small hole gauge and a micrometer, measure valve guides in 3 places top, middle and bottom (Fig. 121). Refer to Engine Specifications. Replace guides if they are not within specification.





Fig. 122

Check valve guide height (Fig. 122).