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#713914 - 11/05/17 12:39 pm Oil pressure release valve thread  
Joined: Apr 2013
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flattrack500 Offline
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Does anyone know the thread diameter and pitch for the oil pressure release valve on a 1972 t100r? I need to get a tap to clean up the threads as my release valve won't hand tighten in, and I don't want to damage the case. Thank you.


Tom
'71 '72 Triumph Daytona flat trackers
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#713920 - 11/05/17 2:10 pm Re: Oil pressure release valve thread [Re: flattrack500]  
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KC in S.B. Online content
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Hopefully DMadigan will notice the thread, he has a file on this kind of stuff.
I would think you will have a tough time finding 1) the right size, and 2) a "bottoming" tap that will not have a long start taper.
As for anything I could offer: Years ago an old timer who worked on these things himself would show me "How We did it....", and at times it was useful in a situation. He showed me a way to dress up or clean up threads in a hole using a tap as a thread chaser. I did use this method several times after and it saved my ass. First, find out thread pitch,...how many threads per inch. maybe you have a thread gage? Then find a tap you have with that same thread pitch, in a size that is smaller diameter. Using that tap as a scraping tool, lay it in the good part of the threads, and drag / scrape it into the problem area. The good threads act as a guide as you hold the "tool" down while scraping away the problem nick or cross threaded portion. It's a Bodge way to get the problem resolved, but as those old timers didn't have a lot of $$ and had the can do attitude, those methods were used when all other options dry up. And they rode the bikes........... Good luck!


Down to 1 BSA, 2 Triumphs, 2 '56 Chevys
#713938 - 11/05/17 5:16 pm Re: Oil pressure release valve thread [Re: flattrack500]  
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Stuart Online content
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Hi Tom,

Originally Posted by flattrack500
thread diameter and pitch for the oil pressure release valve on a 1972 t100r? I need to get a tap to clean up the threads

smile 'Fraid that's likely to be expensive ... Triumph deliberately chose threads that some shade-tree 'mekanik' couldn't replace the release valve with a hardware store bolt to 'improve' the oil pressure. It's a Unified Constant Pitch.

Originally Posted by flattrack500
release valve won't hand tighten in, and I don't want to damage the case.

Risking asking a stupid question, you have checked that the release valve and the case are the same thread? Triumph earlier used a 26 tpi Cycle-based thread on the oprv.

Hth.

Regards,

Last edited by Stuart; 11/06/17 6:45 pm.
#713964 - 11/05/17 8:38 pm Re: Oil pressure release valve thread [Re: flattrack500]  
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DMadigan Online content
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DMadigan  Online Content
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ca, us
I do not have a T100R case to check. The late A65 and A75/T150/T160 have a 7/8-16 UN thread. A tap will not work unless you can grind the end up to the full diameter as they all, including a plug tap, have a lead-in with reduced diameter. One possibility, and cheaper, is to find a bolt of the same size and file slots lengthwise on the end to clean up the threads. Once a tight spot is found turn the bolt only a 1/4 or 1/8 turn and back out to check. You will want to spray brake cleaner or similar through the passages from the other end to clear any chips out.

#714017 - 11/06/17 11:06 am Re: Oil pressure release valve thread [Re: flattrack500]  
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flattrack500 Offline
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Manchester, PA
As always thank you for the replies, I will see what I can do with this information. I am sure some time and patience will prevail.


Tom
'71 '72 Triumph Daytona flat trackers
#714071 - 11/06/17 7:09 pm Re: Oil pressure release valve thread [Re: DMadigan]  
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Stuart Online content
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Stuart  Online Content
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Hi again Tom,

Originally Posted by Stuart
It's a Unified Constant Pitch.

Originally Posted by DMadigan
7/8-16 UN thread.

blush Apologies for the slightly bum info. in my previous post, now corrected.

7/8-16 is Unified Constant Pitch - 7/8"UNF is 14 tpi, 7/8"UNEF is 20 tpi. So, as said, if a tap is available, expect to part with various upper and lower limbs for a one-off job ... Unless Dave knows of a source for 7/8"UNCP bolts? wink

Otoh, 3/8"UNC and 3/4"UNF are both 16 tpi; use one of those - or a thread file - in the way suggested by "KC"?

Hth.

Regards,

#714425 - 11/09/17 10:52 pm Re: Oil pressure release valve thread [Re: flattrack500]  
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NickL Online content
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NickL  Online Content
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Aus



#714534 - 11/10/17 8:18 pm Re: Oil pressure release valve thread [Re: NickL]  
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Stuart Online content
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Stuart  Online Content
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grin


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