I got a Crosman parts order yesterday and found that I had forgotten to order a valve screw. I went to the hardware store and found out I have another mystery size that can not be found. I ordered some from Crosman, but now I will have to wait a week to continue the project I'm working on. Has anyone ever modified this valve for a different screw ? I'm thinking maybe tapping it out to 8-32.
If you are talking about the screw in the bottom of the tube that retains the valve, it is a 5-40 x 3/16". 8-32 would be a little bit large. Better to use a 6-32 x 3/16".
Carl
the 8 x32 can be used pl going to HPA are going 8x32 instead of the 5x40
Jim
Have converted a few 22xx valves to 8-32. I use an 8-32 low head socket head cap screw....the head size matches up to the hole in the tube really well.
You should be able to source something from McMaster-Carr... I bought a box from Acklands Grainger .... I'm in Canada.
If you cannot source them, rather than see you install a "hardware store" variety screw of questionable quality, drop me a pm and I'll send you a couple on the house.
Al
Doing a custom fit you can probably get away with fitting an 8-32 screw. But when Crosman is assembling a hundred guns a day the 5-40 screw is there to give some slop and ease all the alignment issues that occur with the valve and main tube and transfer port tube.
Carl
I'll probably do the 8-32 if I can find a proper screw.
i am guessing this is the scew to be used
http://www.grainger.com/Grainger/UNBRAKO-Socket-Head-Cap-Screw-5PRV2 (http://www.grainger.com/Grainger/UNBRAKO-Socket-Head-Cap-Screw-5PRV2)
this has a better pic
http://www.amazon.com/Metric-Black-Socket-M4-0-70-Length/dp/B00AMMYG2E/ref=sr_1_2?s=industrial&ie=UTF8&qid=1360976770&sr=1-2 (http://www.amazon.com/Metric-Black-Socket-M4-0-70-Length/dp/B00AMMYG2E/ref=sr_1_2?s=industrial&ie=UTF8&qid=1360976770&sr=1-2)
Looks like them. :)
For the curious, some math regarding that screw and valve retention can be found here;
http://www.network54.com/Forum/275684/thread/1328765973/Examining+the+unsafe gadget (http://www.network54.com/Forum/275684/thread/1328765973/Examining+the+unsafe%20gadget)
Al
I considered being a rocket scientist at one point in time, but it gave me a headache. I just want to ensure that the valve does not fall out of the tube when I change cartridges. ;)
Quote from: 7624452 on February 16, 2013, 06:15:22 AM
I considered being a rocket scientist at one point in time, but it gave me a headache. I just want to ensure that the valve does not fall out of the tube when I change cartridges. ;)
;D ;D :-*