Information on cylinder head contact surface - AH01.30-P-1000-05A

ENGINE 112/951/976, 113 

The cylinder head contact surface should only be machined if there is mechanical damage.

It should not be machined (by face grinding) if the contact surface of the cylinder head is uneven (warped) in the longitudinal and transverse directions.

When the cylinder head is mounted again, surface warping will be evened out when the cylinder head bolts are tightened.

Stock removal from the cylinder head and cylinder crankcase of an engine should total no more than 0.3 mm.

If the cylinder head contact surface is machined, the valve seats must be reset.