There are counter-boring at the top of the cylinder liner extending to the top of point of travel of the top compression ring. What are the purpose of them?

asked 24 Jan, 13:53

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It is done to prevent wear of the liner to form ridge at the upper level of the ring crown. Counter-boring is the word utilized to give the tapered shape to the top of the cylinder liner. Because of the tapered boring the formation of ridge is reduced or it will not take place as there is gradual change in the diameter of the liner. Hence if there is any ridge formation it will be removed and any metal will not be allowed to form a ridge. If ridge formation takes place there is a possibility that the piston rings will hit the ridge which may cause the rings to crack and the liner to break.

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answered 24 Jan, 13:55

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