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ENGINE 18 OVERHAUL 3. Check face angle A of each valve, renew any valve with incorrect face angles, do not attempt ° to 45 ° 30’. Lapping-in valves 1. Lap each valve to its seat using grinding paste. into guide and press it firmly, without rotating, 3. Remove valve and check that a continuous, even line of Prussian Blue has been NOTE: Line does not have to be across 4. On completion of lapping-in, check valve head stand down. See this section |