srm prv.

[townsends20]

Can someone tell me if fitting a SRM prv ( a7 type ) to my rgs will give me problems I have fitted one on this rebuild  but have not run it yet, it was tight to go in and I have been told that it will jam if I don't re-tap the thread to relive the pressure on the valve is this so or will I be better of just putting the old one back.
   Steve.     

[MG]

Hmm, how tight is tight?
I don't think it could compress the housing enough to trap the plunger (I assume the SRM valve has a plunger fitted?). You could take the end cap (acorn nut) off, and with the valve in situ in the crankcase, check whether the plunger still moves freely. If it does, it should work okay.

Cheers, Markus

[Brian]

There was a thread about these SRM ones some time back and I actually managed to find it.

http://www.audioworld.net/BSA/forum/index.php/topic,1861.0.html

[A10Boy]

As an update on that thread, I re-fitted the old ball PRV and have had no problems. I bought a tap to run down the threads next time the cases are apart so I can fit the new one.

Cheers

[townsends20]

yes i think thats what i will do. i did ring srm they told me that it could stick the plunger if it is to tight going in and they would send me out a tap to re-thread if i wanted, i told them it was all built and i did not want the bits in the oilways, he said that if the main bearing was still on the bush and has not been modifed it would blow out with the airline! i don't think i want to take that chance, so i think i will take the dome nut off and check the plunger and spring and go from there ( i will probably put the old one back just for piece of mind) what would you do?
  steve

[MG]

SRM also sell new springs and balls for the BSA valves.
I think that is what I would go for, if in doubt about the SRM valve working properly: Fit a new ball, give it a light tap so that it seats in the housing, and replace the old, potentially tired, spring.

[A10Boy]

he said that if the main bearing was still on the bush and has not been modifed it would blow out with the airline!

It wont if the oil hole in the case lines up with the oil groove in the crank journal, it will blow the shite in!