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Original Post (Thread Starter)
#880483 05/13/2022 10:26 PM
by DMadigan
DMadigan
Referring back to this post:
https://www.britbike.com/forums/ubbthreads.php/topics/861708/3
I made the two piece OPRV:
[Linked Image from live.staticflickr.com]
The bearing ball sits against a rubber backed washer, held in by a spiral ring. A hollow set screw sets the pressure on the ball and allows the oil through to the relief hole.
I had to use RTV on the washer because the diameter of the rubber was the same as the bypass slots around the ball. Making the slots slightly less deep will let the rubber seal against the body. In any case there is no leakage with the ball seated.
Being two piece, the body threads can be sealed in the case without potentially blocking the relief hole. A hex is provided on the body for turning it in.
The cap is just a cover.
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#880565 May 14th a 08:38 PM
by Stuart Kirk
Stuart Kirk
The earlier engines can be drilled and tapped for an OP gauge. I've done it several times, even on A10's. I like to use 1/16" NPT for doing it because imho space is limited.

Nice looking valve arrangement but I wonder about the oil pressure pushing against the exposed part of the rubber backed washer. It seems to me it might try to move it some and find a leak path there. Does its retaining clip seat in a groove?

Another concern would be the life expectancy of the rubber seat. Why not use a metal seat like most other relief valves out there? Accurate metal to metal can seal quite well.
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