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#627709 - 11/28/15 3:57 pm Oil Pressure Relief Valve  
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Richard Phillips Offline
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Richard Phillips  Offline
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San Luis Obispo, CA
Is the up grade to the SRM Oil Pressure Relief Valve good idea? I thought I read somewhere that the SRM plunger sticks and using the original ball type was satisfactory.
Thank you,
Richard

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#627713 - 11/28/15 4:10 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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Allan Gill Offline
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Depends who's asking who.

I've had mine stick and after 3000 miles show galling to the piston. I had also been told of the same happening to others which is why I stripped mine down. I also know that when people tell me their oil light keeps coming on, I ask them who's valve they use and it's never the ball type which was linked to this. All these bikes had oil filters and oil changed at 1000 miles or less.

Lyford classics in the uk make a stainless bodied ball type which I now have fitted. He also sells new springs and balls.

Just to add that this is the only product of SRMs that I haven't had good fortune with. Everything else they do has been of excellent quality. Their service has also been second to none and to be completely fair I never contacted them about this issue.

The problem is the same as AMAL had with carbs, two like metals are used.


beerchug
#627714 - 11/28/15 4:12 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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kommando Online content
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I would search for Mr Mike's setup, the ball is not good and does not close until the pressure is much lower than 50 psi and SRM's piston seems to suffer from galling.

#627716 - 11/28/15 4:17 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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triton thrasher Online content
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Do SRM use a stainless piston in a stainless body?

That's stupid.


Amateur Loctite enthusiast.
#627730 - 11/28/15 5:32 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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Zombie Offline
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Florida PanHandle
Has anyone tried to fabricate a Teflon plunger to fit the SRM tube? It should be easy enough to make.

That may be the best of both worlds.

#627731 - 11/28/15 5:36 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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triton thrasher Online content
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Cast iron.


Amateur Loctite enthusiast.
#627732 - 11/28/15 5:38 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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DoubleDiamond Offline
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Stainless on stainless does gall badly, but in the context of an oil pressure release valve, there is plenty of lubricant which should stop that. If an alternative plunger was needed then I would have thought brass might be a good substitute?


BSA: '71 B175; '68 B25; '71 A65; '71 A75
Triumph: '87 T140; '72 T150v
#627733 - 11/28/15 5:40 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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triton thrasher Online content
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Or even go completely mad and use what Triumph used in their trouble-free valve that you're trying to copy.


Amateur Loctite enthusiast.
#627756 - 11/28/15 7:16 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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Rich B Online happy
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Stone Creek OH USA
I've used OEM BSA piston type reliefs and SRM piston type reliefs and have never had issues with sticking or galling. IMO, both provide better control of oil pressure than any ball type is able. Ball type reliefs suffer hysteresis (in simple English - a leak at the seat).

Make sure you use as thin of possible seal under the relief to the cases. Even better, chamfer the cases and use an O-ring for a seal. Don't go crazy tightening the relief. Over tightening can distort the relief body, worst case strip threads.

Both of my A65's are running SRM reliefs currently. I don't baby them....

Just sayin'


Life is too short to drink cheap, bad beer.
#627773 - 11/28/15 8:09 pm Re: Oil Pressure Relief Valve [Re: DoubleDiamond]  
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Florida PanHandle
Originally Posted By DoubleDiamond
Stainless on stainless does gall badly, but in the context of an oil pressure release valve, there is plenty of lubricant which should stop that. If an alternative plunger was needed then I would have thought brass might be a good substitute?



I work with stainless steel every day (boat work). Even if you grease stainless threads, and run them SLOWLY they can, and will gall. I think in these cases it is mostly due to tiny imperfections.

The post just above this one addresses that.

The reason I thought Teflon above brass/cast iron, or some other metal is because of expansion rates.
I think brass would get tight when hot, and cast iron would be lose but I'm not sure.

#627861 - 11/29/15 1:04 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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Richard Phillips Offline
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San Luis Obispo, CA
Ok so lets see, one guy had one stick, any others happening out there. Oh and did it stick closed or open. What was the tell tale sign.
I think comparing screw/bolt threads to precision stainless pistons in a precision stainless cylinder may not be a good example.
Was the later BSA valve piston stainless or another material
Thanks,
Richard

#627863 - 11/29/15 1:16 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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Rich B Online happy
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The original BSA parts were not stainless. The bodies will show rust with age, so some sort of steel.


Life is too short to drink cheap, bad beer.
#627871 - 11/29/15 1:30 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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triton thrasher Online content
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Original Triumph OPR valves were not stainless. The outside was chromed.

There can't have been much use of stainless for moving parts, or load bearing parts.

Stainless steel makes good mudguards.


Amateur Loctite enthusiast.
#627886 - 11/29/15 2:42 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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Richard Phillips Offline
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Ok, anyone else seen a failure in the SRM OPR valves. Has anyone contacted SRM about this controversy
Thank you,

#627888 - 11/29/15 3:05 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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Zombie Offline
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Florida PanHandle
Originally Posted By Richard Phillips

I think comparing screw/bolt threads to precision stainless pistons in a precision stainless cylinder may not be a good example.

Richard



Just re-affirming the cause(s) of galling. Fine imperfections, mis-alignments, a fine granule of debris between machined surfaces, ect...

Otherwise you are correct. Apples do not compare to oranges.

#627891 - 11/29/15 3:12 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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Allan Gill Offline
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I think you should buy one Richard. It's only me that's had the problem ( and those that told me it was an issue which caused me to strip mine)


beerchug
#627896 - 11/29/15 3:28 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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Mr Mike Offline
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Richard,
I have always viewed the pressure relief systems an BSA's as suspect, either through leaks thru the valve itself (ball or piston), hysteresis, or leaking by the threads between the hi and low pressure side of the cavity. I made my own system that relieves directly to the tank and it worked very well. Excellent oil pressure at cruising and hot idle with 30w oil. I posted this system some time ago. I have since sold by A65 with this system installed and made a few kits for others to try but haven't heard of any other results. It worked good for me. If you can't find my post, send me an e-mail and I'll forward it to you.

Mr Mike

#627912 - 11/29/15 4:25 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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Richard Phillips Offline
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San Luis Obispo, CA
Mike and Allen,
\Already bought one, along with the SRM pump and sump plate.I thought it all looked pretty good. I will give it go.
thanks for all the input
Richard

#627913 - 11/29/15 4:29 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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Allan Gill Offline
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The pump and billet sump plate are good. I'm sure you will keep us posted with the outcome and check its condition periodically.


beerchug
#627946 - 11/29/15 6:07 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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Ed V Offline
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One note of caution when installing the new relief valve, be sure the threads are threaded all the way to the bottom of the hole I ruined a new relief valve not checking this with a bottoming tap, what happened was the threads bottomed before the hex contacted the gasket or seal and distorted the body pinching the piston in the bore. I have no one to blame but myself for this as I did not check it. Just a word to the wise. By the way it was an early A65 engine I think 65-66
Ed

#628100 - 11/30/15 2:29 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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Richard Phillips Offline
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Ed,
Thank you and good point. Off hand do you know the thread size

#628159 - 11/30/15 10:16 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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Mr Mike Offline
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Richard,
I have the thread out in the shop. I made several bushings to make my new oil pressure relief system. I am thinking 7/8ths x 16 tpi but let me verify. I could find no tap or die anywhere so I had the bushing made by my brother using a single point cutting tool on his lathe. It is indeed an unusual thread.

Mr Mike

#628181 - 12/01/15 2:20 am Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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Ed V Offline
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I think is it 7/8x20 but I will have to verify that,Mike may be right at 16tpi I will get back to you
Ed

Last edited by Ed V; 12/01/15 2:22 am.
#628243 - 12/01/15 2:04 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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Mr Mike Offline
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I just came back from the shop and the thread is 7/8x16 tpi. I specified a major diameter of .865" +0.000, -0.003 and the thread worked perfectly in the cavity. The bush I made has a 3/8ths NPT port which has a tee threaded into it for a gauge on one side and the return line/pressure relief valve going back to the tank. The return orifice in cavity is plugged with an 8-32 set screw. Gotta pic somewhere but I have a new computer with a new operating system and haven't figured out how to post pics yet. I hate the computer manufacturers....they keep changing how things are done when the earlier versions were simpler and worked just fine.

Mr Mike

#628297 - 12/01/15 5:31 pm Re: Oil Pressure Relief Valve [Re: Richard Phillips]  
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KC in S.B. Online content
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Geez guys, now I'm going to have to take my Jiffy Ajax SRM OPR apart to be sure it's not galling ! I won't have peace of mind until I check. Don't want my recently on the road T-Bolt to blow up!!


Down to 1 BSA, 2 Triumphs, 2 '56 Chevys
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