Pumper aired up but wont fire - help!

Pumper aired up but wont fire - help!

Joined: November 14th, 2004, 5:52 am

December 11th, 2011, 12:38 am #1

I replaced valve seals and lined up the holes on valve upon install.

Pumped her up with 7 pumps and "click" - nothing.

Took hammer and spring out and put a dowell on the exhaust valve stem. Pushed on it and it goes down a half inch or so then springs back - nothing!

How do I release the air from tube? Do I take the pump assembly and plunger off and use a dowel to depress the inlet valve?

If you fellas have any ideas as to what could be wrong and fixes I'd appreciate the advice.

Drew

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Joined: April 28th, 2010, 12:23 am

December 11th, 2011, 12:43 am #2

what model is it
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Joined: November 28th, 2002, 6:26 pm

December 11th, 2011, 1:13 am #3

I replaced valve seals and lined up the holes on valve upon install.

Pumped her up with 7 pumps and "click" - nothing.

Took hammer and spring out and put a dowell on the exhaust valve stem. Pushed on it and it goes down a half inch or so then springs back - nothing!

How do I release the air from tube? Do I take the pump assembly and plunger off and use a dowel to depress the inlet valve?

If you fellas have any ideas as to what could be wrong and fixes I'd appreciate the advice.

Drew

...it doesn't seem possible that the valve is pressurized. What makes you think it is?

Another question: How much time did you allow to elapse between pumping and firing? An air leak might have allowed the charge to escape during that interval.

But in any case, it definitely sounds like it's empty now.

Steve
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Joined: January 17th, 2010, 12:03 am

December 11th, 2011, 1:36 am #4

I replaced valve seals and lined up the holes on valve upon install.

Pumped her up with 7 pumps and "click" - nothing.

Took hammer and spring out and put a dowell on the exhaust valve stem. Pushed on it and it goes down a half inch or so then springs back - nothing!

How do I release the air from tube? Do I take the pump assembly and plunger off and use a dowel to depress the inlet valve?

If you fellas have any ideas as to what could be wrong and fixes I'd appreciate the advice.

Drew

nahh......I'm sure you would have heard air escaping if that were the case.
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Joined: April 28th, 2010, 12:23 am

December 11th, 2011, 1:56 am #5

...it doesn't seem possible that the valve is pressurized. What makes you think it is?

Another question: How much time did you allow to elapse between pumping and firing? An air leak might have allowed the charge to escape during that interval.

But in any case, it definitely sounds like it's empty now.

Steve
good point steve .nt
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Joined: November 14th, 2004, 5:52 am

December 11th, 2011, 4:44 am #6

I replaced valve seals and lined up the holes on valve upon install.

Pumped her up with 7 pumps and "click" - nothing.

Took hammer and spring out and put a dowell on the exhaust valve stem. Pushed on it and it goes down a half inch or so then springs back - nothing!

How do I release the air from tube? Do I take the pump assembly and plunger off and use a dowel to depress the inlet valve?

If you fellas have any ideas as to what could be wrong and fixes I'd appreciate the advice.

Drew

I put the orings in respectively.

Its hard as hell to pump thats how I know the tube is charged! Or, at least it feels like it is. Prior, the gun would pump and shoot but hiss so I replaced the seals. The power was respectable prior to seal replacement.

Drew

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Joined: July 6th, 2005, 5:26 am

December 12th, 2011, 12:42 am #7

the only thing that the dowel hit springs it back? the valve stem will not spring back with air behind it. I don't think you have air in the valve, you may feel resistance, and it could be the check valve is not opening to let air in too.john
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Joined: March 1st, 2002, 12:22 am

December 12th, 2011, 7:01 pm #8

I replaced valve seals and lined up the holes on valve upon install.

Pumped her up with 7 pumps and "click" - nothing.

Took hammer and spring out and put a dowell on the exhaust valve stem. Pushed on it and it goes down a half inch or so then springs back - nothing!

How do I release the air from tube? Do I take the pump assembly and plunger off and use a dowel to depress the inlet valve?

If you fellas have any ideas as to what could be wrong and fixes I'd appreciate the advice.

Drew

I dont recall seeing if you did any valve work or changed springs, so I'm guesing..... but if you changed the internal valve spring, youi may need to cock it forst, then pump it

Spring back? if you feeling like you fight the pump arm after a couple of pumps, then the check valve is not sealing back and allowing any air in the valve to get back out into the pumpt tube, and get out..


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Joined: November 14th, 2004, 5:52 am

December 12th, 2011, 7:35 pm #9

I replaced valve seals and lined up the holes on valve upon install.

Pumped her up with 7 pumps and "click" - nothing.

Took hammer and spring out and put a dowell on the exhaust valve stem. Pushed on it and it goes down a half inch or so then springs back - nothing!

How do I release the air from tube? Do I take the pump assembly and plunger off and use a dowel to depress the inlet valve?

If you fellas have any ideas as to what could be wrong and fixes I'd appreciate the advice.

Drew

To clarify: i repalced the valve seals both exhaust and inlet. Re-assembled making sure to align the exhaust port correctly. Put a few pumps in her until the valve sealed. Then put 6 pumps in with effort increasing with each pump. Cocked and fired several times nothing happened. Took the hammer spring out and inserted a dowel onto the hammer and, with muzzle protected on the floor, pressed down on the exhaust valve pin. The resistance is much more pronounced than with no air or 1 or 2 pumps. It springs back into position after each depression but no air release.

Should I remove the pump linkage and depress the inlet valve to release any air that may reside in the tube? Whats the best and safest way to go about this?

Drew

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Joined: November 28th, 2002, 6:26 pm

December 12th, 2011, 9:58 pm #10

...the valve would hold pressure - without at least releasing it slowly - if you're really pushing the exhaust valve open as you say. Even if the transfer port was somehow plugged solid, air would still leak out around the stem when the valve is held open.

In any case, if the valve is really pressurized like you think it is, it will be very hard to push the check (inlet) valve open against the force of accumulated pressure. The checkvalve is large and can only be accessed through the inlet hole. Even if you can push hard enough with a needle punch or similar tool, the concentrated force will probably damage the valve.

Another approach would be to remove the valve body and s-l-o-w-l-y unscrew the two halves. After just a turn or two, any contained pressure should begin to escape with a hiss. At least this is what happens with 392 valves.

Steve
Last edited by pneuguy on December 12th, 2011, 10:14 pm, edited 1 time in total.
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