Cylinder Head Assembly: Testing and Inspection

1. Check the cylinder head for cracks, damage and coolant leakage.
2. Remove scale, sealing compound and carbon deposits completely. After cleaning oil passages, apply compressed air to make certain that the passages are not clogged.
3. Check the cylinder head surface for flatness by using a straight edge from the direction of A and B, as shown in the illustration.
Cylinder head surface flatness:
Standard Value:
Less than 0.05 mm (0.002 inch).
Service Limit:
0.10 mm (0.0040 inch).

NOTE: If flatness exceeds service limit in any direction, replace the cylinder head, or lightly machine the cylinder head surface.