Why liner fitted with an anti-polishing ring?

asked 20 Apr '18, 01:25

April 20, 2018, 1:25 a.m.
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When a diesel engine burns residual fuel a build up of carbon deposits experienced on the piston top land - between the top ring and the top of the piston crown. Such 
deposits will have the negative effect of polishing the bore of the liner leading to reducing its oil adhesion
 capabilities and increasing wear.

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To prevent deposit formation, the liner can be fitted with a replaceable anti polishing ring (carbon scraper ring). It is a
 steel ring which fits in the top of the liner and has a smaller diameter than the liner, but slightly larger
than the piston crown. As the piston passes over TDC the ring removes any build up of carbon.

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answered 20 Apr '18, 01:36

April 20, 2018, 1:36 a.m.
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