Benjamin 397/2 O-ring sizes
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Benjamin 397/2 O-ring sizes
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Topic: Benjamin 397/2 O-ring sizes (Read 1085 times))
RBQChicken
Expert
Posts: 1648
Real Name: Randy
Benjamin 397/2 O-ring sizes
«
on:
March 06, 2019, 08:17:30 AM »
If you look at the Crosman schematics for the Benji 397-392 valves, they only have the Crosman part number; They don’t have the universal O-ring size listed.
Can anyone tell me what the universal O-ring numbers are for the following Crosman O-rings:
JTX-080 (front-most valve O-ring)
397-037 (Middle (inside) O-ring) (I think TimmyMac said this one is size 112)
397-036 (rear-most O-ring)
It’s not that Crosman’s prices and shipping are too high (just the opposite!), but if I could buy them locally I could get on with my project a lot quicker.
I assume Buna-N 70 durometer is the way to go?
Thanks!
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U.P. of MI
The first time I hit it, I missed. The second time I hit it in the same place.
Psipumper
Marksman
Posts: 352
Real Name: Charles
Re: Benjamin 397/2 O-ring sizes
«
Reply #1 on:
March 06, 2019, 11:46:53 PM »
113 front, 016 rear. Not sure on the middle one.
Just regular buna o-rings.
«
Last Edit: March 06, 2019, 11:48:59 PM by Psipumper
»
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USA Mississippi
RBQChicken
Expert
Posts: 1648
Real Name: Randy
Re: Benjamin 397/2 O-ring sizes
«
Reply #2 on:
March 07, 2019, 12:02:57 PM »
Thanks for the reply.
I read a post by TimmyMac saying the middle (internal) O-ring is a 112, and if you wanted to slightly increase the volume of the valve you could use a taller 113 in that position (not that I'd want to do that for my 397)
Kind of interesting that the front and rear external O-rings are different. You'd think they'd be the same size.
The sizes (in inches) are:
Cross Section I.D. O.D.
#112 .103 .487 .693
#113 .103 .549 .755
#016 .070 .614 .754
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U.P. of MI
The first time I hit it, I missed. The second time I hit it in the same place.
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Benjamin 397/2 O-ring sizes