Valves may only be lapped using fine-grained grinding paste. To perform the necessary rotational movements, a tool with a rubber suction cup is installed on the valve disc. The formation of scratches on the landing chamfers during lapping is eliminated by frequent lifting and uniform rotation of the valve.
Warning: Grinding paste must be carefully removed after lapping.
The appearance of the working surface during the lapping process can also be controlled using fuel: insert the valve, fill the combustion chamber with fuel - fuel must not flow out of the valve guide. Otherwise, repeat the lapping process.
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