Machining the Cylinder Head

Machining the cylinder head

Preliminary work for machining cylinder head
1. Remove cylinder head.
2. Disassemble cylinder head.

Machining the cylinder head
1. Measure cylinder head height on a level surface (surface plate recommended).





Standard dimension -X-: 142.0 ± 0.1 mm
2. Check combustion chamber sealing face of the cylinder head for distortion (flatness) using a straight-edge and feeler gauge.





Permissible unevenness of parting surface for used cylinder head: 0.05 mm





3. Cylinder heads with distorted or scored sealing surface can be repaired by plain-milling them. The following machining criteria must be observed.
Permissible unevenness after machining: 0.03 mm
Permissible roughness profile (can be measured with contact stylus procedure): 15pt14
Permissible surface depth from standard dimension: 0.15 ± 0.05 mm

Subsequent work for machining cylinder head
1. Assemble cylinder head.
2. Install cylinder head.