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Original Model 98 Problems

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Kyle9859 View Drop Down
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    Posted: 20 April 2012 at 10:53am
I am in the process of restoring an old Model 98 for a friend.  When I got the marker, I screwed a tank into it, and heard a big CO2 leak coming from the barrel.  I split the gun, replaced the usual o-rings, reassembled and gassed it up again.  It still leaked from the barrel.  I took it back apart, and took out the power tube.  I hooked gas straight to the power tube to see if the valve was the culprit, and to my relief, it was.  I ordered a brand new valve and put it in after oiling the o-ring.  The gun has stopped leaking, but i still cannot get it to fire more than 2 shots before it acts like its out of air.  

I am using little 12g CO2 cartridges because I don't have access to fill my 20oz tanks.

The gun is completely original, with no modded/aftermarket parts.  The last time the gun was shot and worked was sometime in 2001 - 2002...

From my evaluation, it seems the 12g cartridge adapter is not letting enough air into the valve to supply constant pressure, but what confuses me is that it's only a problem with the model 98.  the adapter and the 12g cartridges work like a charm in my Spyder Compact 2000, Spyder Victor II, and my ViewLoader Orion.

The gas line is not clogged, as I can physically hold the valve open and easily blow air with my mouth through the ASA and it flows easily through the system - out the valve/power tube assembly.

Im unsure what is going on here and why this gun will not fire more then 2 shots.  I can fire 2, then wait about 1 min, then fire a little more. 

Thanks,
    Kyle
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Kyle9859 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kyle9859 Quote  Post ReplyReply Direct Link To This Post Posted: 20 April 2012 at 11:00am
Also, there is no physical damage to the power tube, there are no over tightened screws in the receiver, and I have tested the gun with the velocity screw at many different settings...
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Reb Cpl View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Reb Cpl Quote  Post ReplyReply Direct Link To This Post Posted: 20 April 2012 at 11:53am
Interesting. I seem to remember having trouble with my 12G adapter when I had it hooked to a 98 as well, but that was a long time ago.
 
The first thing I'd check is the adapter itself for the 12 gram. It may not be puncturing the cartridge enough for ample gas to be making it into the marker.
 
THe reason I think this might be the case is, one of the tricks to removing a tank and not blowing the o-rings was to back the tank out a little bit, fire the marker dry until the air in the system is expended, then remove the tank completely and there's no blow out of gas.
If the 12 gram cartridge is only getting a pinhole put in it, then the gas IS filtering into the marker allowing you to shoot, but not fast enough to keep the marker cycling. If you're able to WAIT a bit, then shoot again, it seems to me that the cartridge is re-pressurizing the marker, and you're shooting it with the air that's in the system, then when that's expended after two or three shots, there's not enough in the lines to cycle the marker again until more gas makes its way in.
 
Its a shot in the dark, but I'd try it with a full tank or a different 12 gram adapter if you can get your hands on one.
 
As for why it works in the other markers- I can't really say, but off the top of my head, I can't really think of anything else to try. You've been pretty thorough in your troubleshooting, which makes it all the more confusing for me. LOL
 
You could also try putting a drop or two of oil into the tank adapter on the marker, then gassing it up and shoot.
 
 
.......I don't believe it's got anything to do with the springs or sear or anything like that, since you've got to actually wait for the marker for a few minutes before you can shoot again.
 
 


Edited by Reb Cpl - 20 April 2012 at 11:58am


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TippmannEmployee1 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TippmannEmployee1 Quote  Post ReplyReply Direct Link To This Post Posted: 25 April 2012 at 4:17pm
The 98 is not designed to use a 12 gram cartridge.  Two shots is what you would get if you attempted to use it.  You'll need to get a co2 tank or compressed air tank for your marker. 
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