Cylinder Head Assembly: Testing and Inspection

1. Check the cylinder head for cracks, damage and coolant leakage. If cracked, replace the cylinder head.
2. Remove scale, sealing compound and carbon. After cleaning oil passages, apply compressed air to ensure that passages are not clogged.






3. Check the cylinder head surface for flatness in the direction of A, B. as shown in illustration.
4. If flatness exceeds service limit in any direction, either replace the cylinder head, or lightly machine the cylinder head gasket surface.
Standard value:
Cylinder head surface flatness, Less than 0.005 mm (0.002 inch)
Wear Limit:
Cylinder head surface flatness, 0.1 mm (0.0040 inch)