39 replies to this topic

[CalgaryDave]

Can I attach this expansion chamber BT 4 Expansion chamber  to my BT 4 Assault?  If so, how exactly?

[hp308_911]

SOGsnakebite, on Jun 9 2008, 10:55 AM, said:

Yes u certainly can.................split the clamshells removed the braided line screw in the small brass block and add the brass tube, then the forgrip slides onto the front of the marker

As Sog said...Easy as 1,2,3....But I would put some teflon tape on threads too to make sure there's no leaks.....

[mjohns40]

Man this picture I cooked up has been coming in handy lately...

Just do the OPPOSITE of the instructions here (this is for removing an expansion chamber)


Hope it helps some!

[hp308_911]

That is a handy pic......Good job.....

Will help ppl out when they need a pic to look at instead of trying to read directions......

[CalgaryDave]

Ahh...whew.  Thanks so much guys.  I bought one off ebay and thought maybe I goofed.  That brass fitting threw me.  Thanks for the picture..that made it all clear.

[BRIK]

That's what we're here for...

[CalgaryDave]

I'm just about to install my BT 4 Expansion chamber.  A concern though:  The brass fitting with the little "o-ring" that fits into the square threaded brass piece is not an airtight fit.  When I blow into one end and plug the other with my finger air easily escapes out the o-ring.  This can't be right...no?  Is the o-ring too small? or is it a poor fit right from the manufacturer?

[CalgaryDave]

Ahh ok..I was wondering if that might be the case.  When blowing through it, I can kinda wiggle it and place it so the air doesn't escape, so that makes sense.
Thanks for the speedy response, Snakebite.  I'll report back when I'm finished installing it.

[Hollywood67]

WARNING!!
An issue I encountered last week at the fields. If you are running CO2 with a remote, open the valve SLOWLY!!! Twice last weekend I just cracked the valve as I always have done and in less than 10 minutes I was leaking air from the small o-ring that is on the expansion chamber (where it fits into the brass extension.) Luckely for me, I removed the expansion chamber and let it slowly get back to normal temp, then massaged the o-ring a little to get it back to normal shape. I have found that if you just "open" the valve, the sudden rush of air cools the o-ring making it not seat correctly. The fix (at least for me) was to open the valve slowly and let the expansion chamber fill at a slower rate. After about a minute, I can fully open the valve and all is good.

[JT]

This a pretty good thread. It is now pinned.

[CalgaryDave]

Cool!!  Patting myself on the back now.  Took the whole gun apart, lubed everything up (with proper marker lube) as everything looked dry.  Put teflon tape on all the threads. Installed the new expansion chamber and it works perfectly!!  Handle gets nice n cold when firing a lot of balls.  Thanks for the advice and the pictures!  It was neat seeing how everything works.

[BTWO Jackal]

Glad it's working for you Dave!  Now save your pennies and get an HPA tank!     

[hp308_911]

Great add on if U ask me......Glad U got it on and working for U.....

U'll notice a difference now that U have it on too......

[Banshee]

I added on my new expansion chamber the other day and it leaked from around the o-ring on the magazine where it enters the gold tube. And i removed the chamber to examine the problem and now my screws don't work . Any ideas???

[bvdave]

Banshee, on Oct 22 2008, 03:52 AM, said:

I added on my new expansion chamber the other day and it leaked from around the o-ring on the magazine where it enters the gold tube. And i removed the chamber to examine the problem and now my screws don't work . Any ideas???

were you using thread tape that will help with leaking from parts like that, or you can use blue loc tite? and by teh screws wont work do you mean they wont screw in? look at the threads, how do they look?

[Banshee]

I will look in to using the tape you mentioned but when i look at the screws, i can still feel the threads but they won't grip when i screw them in...