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Piston Ring Gap
Posted: Sat Apr 14, 2018 5:16 pm
by Mad Mart
What should the piston ring gap be on the top & second rings on a Sprint? I'm looking in the 'operations repair manual' and I can see the diagram but it says "refer to data". I've looked at the data but I can't see anything related.
Re: Piston Ring Gap
Posted: Sat Apr 14, 2018 10:37 pm
by MIG Wielder
Hi Mart, I have the AKM3629 manual dated 1977 and the Data is squirreled away on Page 12-5
But to answer your question ...
The Top compression ring gap is given as 0.0138 to 0.0217 in
The Scraper ring gap is given as 0.0138 to 0.0217 in ( the same )
Oil control chrome rail is given as 0.015 to 0.055 in
Oil control expander rail gap is "Ends to butt"
Let me know if you would like a scan of these pages.
HTH,
Tony.
Re: Piston Ring Gap
Posted: Sat Apr 14, 2018 11:51 pm
by soe8m
The best is to have the second ring slightly wider gap as the top ring.
Jeroen.
Re: Piston Ring Gap
Posted: Sun Apr 15, 2018 10:58 am
by Mad Mart
Thanks Tony/Jeroen.
I had found those figures (even in the Haynes manual on page 49) but wasn't sure that the "fitted gap" was what I was looking for. I thought they were referring to the tolerance in the piston groove height.