Cylinder Head
CLEANINGRemove all gasket material from cylinder head and block. Be careful not to gouge or scratch the aluminum head sealing surface.
Clean all engine oil passages.
To ensure engine gasket sealing, proper surface preparation must be performed, especially with the use of aluminum engine components and multi-layer steel cylinder head gaskets.
NOTE: Multi-Layer Steel (MLS) head gaskets require a scratch free sealing surface.
Use only the following for cleaning gasket surfaces:
- Solvent or a commercially available gasket remover
Fig. 109
- Plastic or wood scraper (Fig. 109).
- Drill motor with 3M Roloc Bristle Disc (white or yellow)
CAUTION: Excessive pressure or high RPM can damage the sealing surfaces. The mild (white, 120 grit) bristle disc is recommended. If necessary, the medium (yellow, 80 grit) bristle disc may be used on cast iron surfaces with care.
INSPECTION
Fig. 110
1. Cylinder head must be flat within 0.1 mm (0.004 inch) (Fig. 110).
2. Inspect camshaft bearing journals for scoring.
VALVE GUIDES
1. Remove carbon and varnish deposits from inside of valve guides with a reliable guide cleaner.
Fig. 111
2. Using a small hole gauge and a micrometer, measure valve guides in 3 places top, middle and bottom. Refer to Engine Specifications (Fig. 111). Replace guides if they are not within specification.