98c Expantion chamber leak

Sup guys I just got my gun of someone and they have done a fair bit of work on it.

The problem that i have is that the expantion chamber is leaking between the middle and top of the handle, if you have one you will know what i mean.

Any help apprecated would really like to fix it but would need to know how to do it or it even can be.

We really need more info to provide any truly useful help.

• What marker are you using?
• What brand expansion chamber is it?

A picture with some indication of exactly where the leak is occurring would be very useful.

Mack wrote: We really need more info to provide any truly useful help. What marker are you using? What brand expansion chamber is it? A picture with some indication of exactly where the leak is occurring would be very useful.

as I say a 98c see the pic above for what one im using.

Good luck. Expansion chambers are horrible to disassemble for maintenance. The segments are usually loctited together, youll need a bench vise and a strap wrench or so to even try to break it apart.

I wish I could offer more, but a leaky expansion chamber is usually a nightmare even for an experienced airsmith.

Both of the above are true.  However, from the way he described the problem, if he is very lucky, it might just be an o-ring.

Edited note:  Heck, if his expansion set up is exactly like the picture, the x-chamber may just have backed out a bit.


Edited by Mack - 13 March 2008 at 2:49pm

If your expansion chamber set up is exactly like the picture you posted, it is actually two separate pieces.  The dull somewhat "L" shaped piece is actually a vertical adapter; it is an after-market addition that allows you to replace the standard front plastic grip with an expansion chamber.  The shiney black piece is the actual expansion chamber.  It screws into the vertical adapter the same way a tank screws into the ASA.

If you look closely at the bottom of the expansion chamber you will notice a seam.  This feature allows the bottom of the chamber to rotate independent of the rest of the chamber.  This is to allow for proper alignment of the air line on different marker applications.  Because of this design, it is possible for the upper part of the expansion chamber to be turned (essentially unscrewed) from the vertical adapter without having to remove the ASA from the marker.  (This is never a good idea as the stress put on the expansion chamber from to short of an airline between it and the ASA could cause mis-alignment/cross-threading issues.)

Anyway, the expansion chamber may not have been screwed all the way in during installation.  Another possibility, if the marker has seen quite a bit of use, is that constant handling of the expansion chamber while using it as a front grip may have unscrewed it a bit.

Yeah It looks like it jsut unscrewed a bit overtime. does it matter if I tighten it so that it doesnt turn? doesnt seem to effect it.