2. To check, place a steel ruler on the surface and use a flat feeler gauge to measure the deformation in the directions shown in the illustration below.
3. If it is possible to insert a feeler gauge with a thickness of more than 0.10 mm, the head should be sent for grinding.
4. The cylinder head can be ground to a value of up to 0.2 mm, but in this case the cylinder block cannot be ground. Otherwise, the block and cylinder head can be ground to a total of no more than 0.2 mm. After grinding, the height of the cylinder head should be measured. To do this, use a large caliper that reaches both surfaces. The cylinder head can be used as long as it has the permissible height. After grinding the head, it is possible that the camshaft will seize. In this case, the cylinder head must be replaced.
Check the cylinder head surface for deformation. Take measurements in the directions indicated (6 in total).