Tuning Any Old School Theoben Rapid guys on here? -- Leaking problem

[ShootingNewB]

One of my MFRs is leaking. This one is regulated. Thank holds air beautifully up to 2700 psi; however when it's screwed into the reg, it's leaking from the small set screw shown in the pic below.

A friend and I cranked on the tank and regulator to get them to tighten together, but it doesn't stop air from coming from this hole.

Not sure why there's even a set screw right there and why can't I loosen/tighten it to any position that won't leak air?

Anyone have an suggestions/ideas?
Thanks in advance for any help!
-Jimmy

 

[Airgunmann]

Weep hole in the regulator Wich means it needs a couple orings inside changed

 

[ShootingNewB]

Ah, okay. I'll take the reg off and replace any rings I can find inside. Thank you!

 

[Airgunmann]

Probably have to sand the seat flat too I'd use like 800 grit then 1500 grit and try to stay as flat as possible

 

[NAProf]

Hey ShootingNewB,
Wanted to contact you about your high capacity Brocock Magazines. Are you still making and selling them? PM me.
Cheers,
Greg White

 

[Ca_Varminter]

Wrong position for the atmospheric equalization hole....Bleed hole
The position looks like the set screw that secures the valve depressing disk....

The smaller hole that is close to the receiver is the bleed hole..
If you look in the larger hole, you should see an allen set screw..
So loosen it and you can unscrew the depressing disk...

Underneath it is the sealing O-ring for the disk..

So what is causing the leak from that large hole on the Reg for the MFR. It is the Bottle sealing O-ring on the depressing pin!!

here is a hot of some of the More common O-rings used in the Rapid Airguns.....

HTH,
Good Luck,
Stuart

 

[John "spysir" Blount]

Stuart, Thanks for adding the pictures to your educated information. Pretty well certain you are correct.
John

 

[joelayfield]

Take the bottle off and see if the bottle holds air. Remove as many variables as possible. Then it would be a matter of disassembling the receiver and look for debris and bad rings

it doesnt matter if the bottle holds air or not , it matters that the o ring on the bottle is good . ,