Richard Young Posted June 25, 2016 Report Share Posted June 25, 2016 Now Installing new pistons and rings (Rimmers). On the middle and top ring I.D. there is a chamfer.Does it matter whether the chamfer faces up or down.Hope someone can help Quote Link to post Share on other sites
TriumphV8 Posted June 25, 2016 Report Share Posted June 25, 2016 Normally the upper side is marked with a tiny little "TOP". If not the chamferred side goes up to allow the pressure from the combustion to press the ring down,make a little gap above the ring and go than and find its way behind the the ring on ID and press it to the outside for better sealing. Sometimes rings are not just square or/and top and second are from different material and should not be mixed up. If there is no "TOP" stamp this might be an indication that they are square and it does not matter which side up. Quote Link to post Share on other sites
Richard Young Posted June 25, 2016 Author Report Share Posted June 25, 2016 Andreas, Sorted....just now checked the rings again and there is 'top' in really minute letters..Missed it the first time.....So I'm on track again...thanks again for replying so quickly. Richard.. Quote Link to post Share on other sites
john.r.davies Posted June 25, 2016 Report Share Posted June 25, 2016 Some say ... that the chamfer on the top of the top ring is to allow it to clear a small ridge left by the old ring, when a square edge would collide with it and lead to early failure. But whatever the reason. the chamfer goes on top! John Quote Link to post Share on other sites
Richard Young Posted June 25, 2016 Author Report Share Posted June 25, 2016 (edited) Hi John, Its on the Inside diameter not outside, so it sits inside the grooves.. Anyway Andreas give me an interesting explanation why its there...so, happy bunny now. Edited June 25, 2016 by Richard Young Quote Link to post Share on other sites
Motorsport Mickey Posted June 25, 2016 Report Share Posted June 25, 2016 Good illustration of why a COMPLETE and ACCURATE description of where items are is essential, a chamfer or even a small shoulder about 10 thou formed in the top of a ring on the outside making the ring a ridge dodger (to miss any wear shoulders worn into the cylinder bore) is not unexpected, but on the inside is another story. Got to tell you that Andreas description is for a chamfer on the OUTSIDE, and for the reason he describes, allowing gas to be transferred and pushing the ring out. Stick with the fitment of the rings with top pointing not unnaturally ...to the top. Mick Richards Quote Link to post Share on other sites
GT6M Posted June 25, 2016 Report Share Posted June 25, 2016 did ye check yer oil scraper rings for deflection in 1 plane, !!! M Quote Link to post Share on other sites
Richard Young Posted June 26, 2016 Author Report Share Posted June 26, 2016 GT6M No. Quote Link to post Share on other sites
Richard Young Posted June 26, 2016 Author Report Share Posted June 26, 2016 (edited) Thanks Mick..appreciate your input Edited June 26, 2016 by Richard Young Quote Link to post Share on other sites
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