Thoroughly clean the sealing surfaces of the cylinder head and cylinder block, and check that the surface of the head is not warped. To do this, put a measuring ruler on the head and, using a thickness gauge, determine the size of the light gap along, across and diagonally on the surface of the block head. In the event that a plate gauge with a thickness of more than 0.1 mm can be inserted into the gap. surface grinding of the cylinder head should be carried out. If there is a large gap anywhere in the head, it should be replaced.
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