[TR] Ring gaps

Alex&Janet Thomson aljlthomson at charter.net
Fri Feb 12 15:38:00 MST 2016


In the first case, those two sets of measurements seem to agree on the upper
end - 0.003 x 3.250 = 0.00975.  But a total of just 0.003" does seem quite
snug.

 

On the related topic, the question is where does the wear exist? Is it in
the cylinder or in the ring. You can always use a telescoping gauge and
micrometer to see what the bore actually is. And/or. if you can obtain a
sleeve of rings for just one cylinder, install a compression ring by itself,
square it to the hole at several locations, and see what you have for ring
end gap. Since those are sleeved engines, you could also purchase
piston/sleeve kits but that gets expensive. I have found that on tractor
engines where someone has installed aftermarket piston/sleeve big bore kits,
it may be difficult to find replacement rings for those pistons. What does a
compression test tell you on that engine?

 

Alex Thomson

 

From: Triumphs [mailto:triumphs-bounces at autox.team.net] On Behalf Of Andrew
Uprichard
Sent: Friday, February 12, 2016 4:02 PM
To: triumphs at autox.team.net
Subject: [TR] Ring gaps

 

The manual for the TR3 says the ring gap should be 0.003 - 0.010.  But I
have new pistons and rings marked that the gap should be 0.003 - 0.004 per
inch diameter of the bore.  3 thou sounds awfully tight to me, but what do
others think?

 

On a related subject, a friend has an engine where the ring gap is 0.040.
How much of this could be made up by simply replacing the rings?  Or is
there a point at which the only solution is bigger pistons +/- rebore?

Andrew Uprichard

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