A cylinder head has required substantial metal removal to make it flat. Technician A says that a shim can be installed under the head gasket to compensate. Technician B says that on OHC engines, the valve timing will be retarded. Who is right?

Question

Quizplus · Accepted Answer

Both technicians are correct. Technician A is right in saying that a shim can be installed under the head gasket to compensate for the material removed from the cylinder head, which helps maintain the proper compression ratio and sealing. Technician B is correct in stating that on overhead cam (OHC) engines, removing material from the cylinder head or using a shim can affect the geometry of the timing belt or chain setup, potentially retarding the valve timing.

A Cylinder Head Has Required Substantial Metal Removal to Make