Black Knight springs

Madmox · 05-12-2007, 11:42 PM

I have this archaic Black Knight that has been sitting in my bag for probably 10 years as it hasn't worked quite right since its infancy. When you gas it up you hear a slight leaking down the barrel which would typically mean a cup seal, but when you shoot several times the leaking out the barrel gets progressively worse. Any ideas? New springs somehow i doubt a cup seal will be easy to find unless it was not a proprietary piece. Anyone have any ideas?

Mox

HP_Lovecraft · 05-13-2007, 12:05 AM

There is some information here, but not much.

Sometimes the cause of that is the primary oring on the cupseal is swollen/cracked/old, and firing the gun just makes it worse

I have no idea if those orings are Montneel compatable, not that it helps, since Montneel parts are not really floating around either. But if you look at the upper-right part of the following diagram, you can see SORTA how the valve looks when taken apart.

Get that old oring out, hopefully in 1 piece, then take to hardware store to find a sutable match

C5TEK · 05-13-2007, 12:20 AM

If it is an oring and can figure out the size of the o ring I have a huge selection of rings here...I may be able to get you a couple.

Madmox · 05-14-2007, 05:52 PM

Hmm I have to run to the Hardware Store today and i'll see if they have an urethane o-ring set kicking around i'll let you all know. I don't even know why im trying to fix this piece of crap. Maybe because it is there.

Mox

Robertsr · 05-14-2007, 09:02 PM

They're actually not that bad. The valve is about twice the volume of the montneel (so no o-rings are compatible to my recollection), so you don't get much shoot down. You can get 5-6 rounds a second out of them, and the stock barrel is pretty accurate.

Burgfield International was still in business 5-6 years ago when I had the 2 that I bought, and I got a Blacknight to Spyder barrel adapter from them that made the thing a nice little shooter all around.

You may be surprised how tight it is once you get it all together.

Madmox · 05-15-2007, 02:11 AM

I ran a search for Burgfield International into google and a company by that name makes Pots and pans... I wonder if it is the same company. Ok i'll keep working on it and see what happens.

Mox

HP_Lovecraft · 05-15-2007, 03:16 PM

The main weak points are that the gun is held together with small screws threaded directly into the plastic.

And since the gun is EXTREMELY LIGHT, those screws take much of the abuse of the hammer hitting the valve/body/etc.
So, they tend to strip out.

The bolt-cover is especially quirky. You have to make sure its properly aligned when you tighten everything together, or the bolt will stick, and you will get a very nasty mess inside the gun.

But... its pretty light. Combine a 7oz, with a small hopper, and it makes a handy little backup gun. Maybe even do a stock-clock conversion?

It would be trivial to hook up a 12-gram directly to the valve, and remove the rear ASA, and Hose/fittings. Then melt a hole into the feed tube, so you can glue a horizontal tube into it?

Nick

05-12-2007, 11:42 PM	#1 (permalink)
Madmox Active Member Join Date: May 2007 Posts: 133	Black Knight springs I have this archaic Black Knight that has been sitting in my bag for probably 10 years as it hasn't worked quite right since its infancy. When you gas it up you hear a slight leaking down the barrel which would typically mean a cup seal, but when you shoot several times the leaking out the barrel gets progressively worse. Any ideas? New springs somehow i doubt a cup seal will be easy to find unless it was not a proprietary piece. Anyone have any ideas? Mox

05-14-2007, 09:02 PM	#5 (permalink)
Robertsr Ultimate Battle Monkey Z Join Date: Apr 2006 Location: Waynesboro, VA Posts: 3,131	They're actually not that bad. The valve is about twice the volume of the montneel (so no o-rings are compatible to my recollection), so you don't get much shoot down. You can get 5-6 rounds a second out of them, and the stock barrel is pretty accurate. Burgfield International was still in business 5-6 years ago when I had the 2 that I bought, and I got a Blacknight to Spyder barrel adapter from them that made the thing a nice little shooter all around. You may be surprised how tight it is once you get it all together. __________________ Geriatrically Assured Destruction

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05-13-2007, 12:05 AM	#2 (permalink)
HP_Lovecraft Post Whore Join Date: Aug 2006 Location: Southern Maine Posts: 2,735	There is some information here, but not much. Sometimes the cause of that is the primary oring on the cupseal is swollen/cracked/old, and firing the gun just makes it worse I have no idea if those orings are Montneel compatable, not that it helps, since Montneel parts are not really floating around either. But if you look at the upper-right part of the following diagram, you can see SORTA how the valve looks when taken apart. Get that old oring out, hopefully in 1 piece, then take to hardware store to find a sutable match

05-14-2007, 05:52 PM	#4 (permalink)
Madmox Active Member Join Date: May 2007 Posts: 133	Hmm I have to run to the Hardware Store today and i'll see if they have an urethane o-ring set kicking around i'll let you all know. I don't even know why im trying to fix this piece of crap. Maybe because it is there. Mox

05-15-2007, 02:11 AM	#6 (permalink)
Madmox Active Member Join Date: May 2007 Posts: 133	I ran a search for Burgfield International into google and a company by that name makes Pots and pans... I wonder if it is the same company. Ok i'll keep working on it and see what happens. Mox

05-15-2007, 03:16 PM	#7 (permalink)
HP_Lovecraft Post Whore Join Date: Aug 2006 Location: Southern Maine Posts: 2,735	The main weak points are that the gun is held together with small screws threaded directly into the plastic. And since the gun is EXTREMELY LIGHT, those screws take much of the abuse of the hammer hitting the valve/body/etc. So, they tend to strip out. The bolt-cover is especially quirky. You have to make sure its properly aligned when you tighten everything together, or the bolt will stick, and you will get a very nasty mess inside the gun. But... its pretty light. Combine a 7oz, with a small hopper, and it makes a handy little backup gun. Maybe even do a stock-clock conversion? It would be trivial to hook up a 12-gram directly to the valve, and remove the rear ASA, and Hose/fittings. Then melt a hole into the feed tube, so you can glue a horizontal tube into it? Nick