mcarterbrown.com  

Reply
 
Thread Tools Search this Thread
Old 09-25-2017, 12:44 AM   #1 (permalink)
Perfection will suffice
 
Menace's Avatar
 
Join Date: Oct 2008

Rebuildable Cup Seals?

All,

Just curious. Seems most of the time I see replacement cup seals, it's the entire stem assembly, not just the seal itself.

Aside from explicitly rebuildable ones like CCM, are any of these things actually rebuildable?

For instance, lots of the older ones (and many of the Palmer's style) have a stainless stem with a brass head and some sort of plastic sealing face.

Obviously that was built from three pieces.

So if that type fails, can it be disassembled and the plastic piece be replaced?

Thanks very kindly!
__________________
"Dude. I'm pretty sure he's behind one of those bunkers over there."



My Feedback: https://www.mcarterbrown.com/forums/f...-feedback.html

Have you seen That Paintball Channel?
Menace is offline   Reply With Quote
Old 09-25-2017, 11:12 AM   #2 (permalink)
trophy husband
 
rawbutter's Avatar
 
Join Date: Feb 2012
Location: Fredericksburg, VA

You can buy just the seals, but I'm not sure if they're one-size-fits-all. I seem to remember working on a marker a few years ago, and the Spyder cup seal wouldn't screw into the stem on the different marker. Like...the threads were too large or small.
rawbutter is offline   Reply With Quote
Old 09-25-2017, 12:12 PM   #3 (permalink)
MCB Member
 
Spider!'s Avatar
 
Join Date: Dec 2008
Location: Houston, TX

Bacci and Ebay have some Black Magic seals. If you have a stem that matches, they do seem to work pretty well.

I have rebuilt an ICD cup seal and found it was a fairly stubborn process (with an ICD seal). The seal is pressed in and takes some effort and/or tooling. Once you have a good seal in there, they seem to last a very long time when you take care of them. I'm guessing that's why you find the whole stem for sale most of the time.

Matching the existing cup and stem is a trick when your mixing parts. I ended up making a little press block out of wood to fit in my bench vise as a press.
__________________
My Feedback

some things are stickier than others
Spider! is online now   Reply With Quote
Old 09-25-2017, 03:59 PM   #4 (permalink)
Perfection will suffice
 
Menace's Avatar
 
Join Date: Oct 2008

Thank you both!

Spider, with your wooden rig, how difficult is the pressing process?

Just trying to get some ideas for later down the road.
__________________
"Dude. I'm pretty sure he's behind one of those bunkers over there."



My Feedback: https://www.mcarterbrown.com/forums/f...-feedback.html

Have you seen That Paintball Channel?
Menace is offline   Reply With Quote
Old 09-25-2017, 04:35 PM   #5 (permalink)
MCB Member
 
Spider!'s Avatar
 
Join Date: Dec 2008
Location: Houston, TX

Quote:
Originally Posted by Menace View Post
Thank you both!

Spider, with your wooden rig, how difficult is the pressing process?

Just trying to get some ideas for later down the road.
Once you got it all started and lined up, it pressed in easily. It is just hard to push on evenly without something that goes around the whole face. Of course you have to avoid putting a scratch or dent in the face as well. Depending on the actual seal, there is probably a cartridge case that you could drill and sand smooth to fit. That would let you see what you were doing better. I used a pair of small oak blocks with holes drilled in them. My little bench vise is pretty stout for the job.

If you had a partner monkey, you could use a large c-clamp. Otherwise, holding it all together while turning the screw gets pretty silly. It's possible by yourself, especially if you use your toes.

That's for seals that are like soft delrin. Softer seals are usually captured by the stem base over the cup. Those stems may be loctited on, but the seal goes in easier. Shocktech comes to mind.

I've had pretty good luck faking regulator seals and making whole delrin cups, but for friction fit cup seals, I've always ended up with a purpose made seal to go into that particular manufacture of cup and stem. When the hammer knocks the poppet open, it really pulls on that cup seal.
__________________
My Feedback

some things are stickier than others
Spider! is online now   Reply With Quote
Reply

  mcarterbrown.com » Paintball » The Armory » Autocockers

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump


All times are GMT -4. The time now is 08:50 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO
© MCB Network LLC