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.

NOTE: 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 as shown.
Cylinder head flatness:
Standard value: Less than 0.05 mm (0.0020 inch).
Limit: 0.1 mm (0.0040 inch).

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