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The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s.
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 Post subject: Piston Ring Gap
PostPosted: Sat Apr 14, 2018 4:16 pm 
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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.

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 Post subject: Re: Piston Ring Gap
PostPosted: Sat Apr 14, 2018 9:37 pm 
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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.


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 Post subject: Re: Piston Ring Gap
PostPosted: Sat Apr 14, 2018 10:51 pm 
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The best is to have the second ring slightly wider gap as the top ring.

Jeroen.

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 Post subject: Re: Piston Ring Gap
PostPosted: Sun Apr 15, 2018 9:58 am 
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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.

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Sprintless for the first time in 35+ years. :boggle2:

2007 Porsche Boxster S


Image

Grammar:
The difference between knowing your sh#t and knowing you're sh#t.

Schedule: Pronounced "Shedule" not "Scedule"!


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