RB45 Posted November 8, 2019 Report Share Posted November 8, 2019 Can anyone tell me the factory recommended ring end gap for a M116 Alpina (new rebore, piston and rings)? My service manual has 2 listings: Ring End Gap .002 New .012 Thanks. Quote Link to comment Share on other sites More sharing options...
konrad Posted November 9, 2019 Report Share Posted November 9, 2019 If you don't get a better answer, I'll say that 0.002" is too tight for anything. I'm guessing it may be a misprint and should be 0.020" as the service limit. 0.012" seems roughly right for new rings. At the risk of stating the obvious, the purpose of the end gap is to allow clearance for expansion as the ring gets hot -- you do not want the ends to ever touch. Minimum end gap is a function of bore diameter and operating temperature. New end gap is typically on the order of 0.004" per inch of bore. 1 Quote Link to comment Share on other sites More sharing options...
RB45 Posted November 9, 2019 Author Report Share Posted November 9, 2019 Thanks. One reference I found said to use .004 x bore for the top and .005 x bore for the lower ring. Thanks again. Quote Link to comment Share on other sites More sharing options...
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