oliver2-44 10,739 #1 Posted June 19, 2016 Per the Kohler manual they supplied rings as STD, .003, .010. .020 and .030 oversize Recently while talking with a "Sears" tractor collector about rebuilding engines he said that the Briggs and Kohler "STD rebuild kits on the market today all actually have -003 oversize rings in them. That way if you engine has a little wear, but is still in standard spec these .003 oversize rings will take it close to back to new compression. Anyone have the straight answer? Is this correct for Kohler replacement rings? Is this correct for all aftermarket replacement rings? Share this post Link to post Share on other sites
953 nut 60,219 #2 Posted June 19, 2016 Regardless of the source, you need to square up the rings in the cylinder and check end gaps prior to installing them to be sure. 2 Share this post Link to post Share on other sites
Achto 29,408 #3 Posted June 20, 2016 You should do this any time your installing new rings, weather you are over boring or just installing new rings. 2 Share this post Link to post Share on other sites
Achto 29,408 #4 Posted June 20, 2016 As a general rule a MINIMUM of .0035 gap per inch of cylinder diameter on cast rings. Example: 4" (bore) x .0035 = .0 14 minimum gap. But always check your manual for the manufacturers specifications. Share this post Link to post Share on other sites
Howie 899 #5 Posted June 20, 2016 I suspect this is not true anymore. A lot of the Briggs I have done the gap clearance even with minimal wear will not even get it close to the lower spec. It will be in spec but probably closer to the mid point. I think some of those used to say good for up to .003 cylinder wear. I did not go refresh my memory on what the manuals say on this though! Share this post Link to post Share on other sites
