Cylinder Head

INSPECTION
Check the top surface for damage caused by the cylinder head gasket leaking between cylinders.





Fig. 228

Inspect the block and head surface for nicks, erosion, etc.
Check the head distortion (Fig. 228). The distortion of the combustion deck face is not to exceed 0.010 mm (0.0004 inch) in any 50.8 mm (2.00 inch) diameter. Overall variation end to end or side to side 0.30 mm (0.012 inch).
DO NOT proceed with the in-chassis overhaul if the cylinder head or block surface is damaged or not flat (within specifications).

REFACING HEAD SURFACE





Fig. 229

The cylinder head combustion deck may be refaced in whatever increments necessary to clean up the surface and maintain the surface finish and flatness tolerances. The combined total of stock removed must not exceed 1.00 mm (0.03937 inch). The amount of stock removed each time must be steel stamped above combustion deck edge, on the lower right hand corner of the rear face (Fig. 229). Check valve protrusion after head surface refacing.
Surface finish requirements are 1.5 - 3.2 micrometers (60 - 126 microinch).





Cylinder Head Stock Removal Chart

CLEANING

CAUTION: Do not wire brush head surface while fuel injectors are still installed. Fuel injector damage can result.

Clean the carbon from the injector nozzle seat with a nylon or brass brush.
Scrape the gasket residue from all gasket surfaces.
Wash the cylinder head in hot soapy water solution (88°C or 140°F).
After rinsing, use compressed air to dry the cylinder head.
Polish the gasket surface with 400 grit paper. Use an orbital sander or sanding block to maintain a flat surface.