Benjamin Bulldog, Valve Body Removal ?

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Cybergrizzly

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Apr 3, 2019
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Panama
Hi, Folks. I am usually good at repairing airguns of all kinds, but got stuck with a Benjamin Bulldog. It appears that there is an air leak coming from the transfer port. I replaced the valve stem with a new one. Air still comes out from the TP. Cocked the lever while filling the gun, still leaks. Removed the hammer spring while filling, still leaks.

I can only think that the seals of the valve body are bad and need replacing. Can anyone provide some instructions as to how to remove the valve body?

I got the hammer out and I can see what is known as the "valve nut" with a hex center hole. Tried lightly to loosen o tighten but it is not moving and I don't want to damage anything. Underneath the action block there is also a "valve orienting pin" which I really don't see how to remove it, so I think it stays. Tried to lightly hammer out the valve housing from the hammer chamber with a T-hex key going through the valve nut...light blows on the T-hex with small rubber mallet. Valve housing didn't move.

Just to add that I can fill the rifle almost to 3000 psi but the leak hisses throughout the fill process. It starts to fill normally but maybe around 1200 psi the leak begins

Anyone ? Need help
 
You need to unscrew the large hex valve retaining nut all the way out from the hammer (rear) end and it should easily come out the rear by bumping the rear on a flat surface on a towel.

The valve housing is only held pressed fitted in place by 2 o-rings use a dowel rod pushed through stick that dowel in the rear hammer end it comes out from the front same side your valve stem and spring came out.

You either have one of valve housing outer o-rings damaged or the delrin valve pin seat (poppet) isn't seating well inside the Valve housing.


 
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You could try to stop that leak also by saying a prayer and remove and reinstall the Valve stem and reseat that valve spring be sure it's seated properly onto that valve stem and be sure that double male threaded air tube adapter is tightly screwed in to the receiver via large hex before screwing the air tube back on and bang the gun with a rubber mallet while filling the gun to force it to seat properly.


 
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NOPE and just so you know why... Unscrew 20 from 3 because of 12. (And because i don't know how the hell to remove that 12 anyway LoL)

Screenshot_2020-09-13-04-08-462.1600006329.png

 
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Got it out. Had to partially disassemble the trigger action and a couple things but it worked out.

Thanks.

IMG_20200913_105734 1.1600017373.jpg
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Glad you were able to get it out.

If you look very closely upon reassembly you will find that it is not necessary to disassemble quite to that extent in the future. The valve carrier "nut" for lack of a better term does not have to come out, removing it is what forced you to remove the cocking stud and hammer catch. You just turn the valve carrier nut counter clockwise until it is disengaged from the valve carrier. Then use something suitably sized as to pass through the hex portion of the valve carrier nut , but larger diameter than the poppet stem, to push the valve carrier out the front of the breech.
 
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Got it out. Had to partially disassemble the trigger action and a couple things but it worked out.

Thanks.

IMG_20200913_105734 1.1600017373.jpg
Click to expand...

Sorry it was MY BAD since I am the type to have an uncontrollable urge to want to totally disassemble things and clean and inspect everything when something goes wrong.

AND! Check QC and see how everything is put together internally and learn how everything works.
 
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Along the same lines, I had loaned my bulldog to a buddy that has one on order (my mistake) My bulldog is modified with an n.302 port size modification, a huma regulated extended air reservoir with a quick connect fill nozzle on the end. The problem came when whistle britches decided to fill the air reservoir from the old, rear fill nozzle (that I hadn't removed) he says that at some point in the fill process, there was a loud sudden release of air, and that it then took an additional several minutes for the tank to completely drain.

I now hove a bulldog that will not hold air. On disassembly of the receiver, a small green steel (composite) micro tube was found in the area of the trigger sear assembly area, loose and able to be picked out with tweezers (attached pic) not sure what this is, but my thinking is that it is toast. I can find no such part, or anything that looks like it on available schematics, so I am guessing it is an inclusive internal piece of another part, perhaps the valve body? I've ordered a kit from Captain O ring, and will be replacing all o rings, but that's not going to explain my little green friend and where he came from. Any help appreciated

Mac

IMG_2842-1.1612456164.jpg

 
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