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 Replacing a CVA Drum

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FrontierGander
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FrontierGander

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PostSubject: Replacing a CVA Drum   Wed 16 Jan - 1:29

A while back, I was cleaning and inspecting my brothers spare CVA Mountain Stalker. Removed the nipple, cleaning the thread when I noticed a good sized crack in the threads where the nipple screws into. Today for some odd reason, under a preview of items listed, I found a direct replacement CVA Drum! I bought that sucker up in a hurry.

What do you think? Soak that drum in penetrating oil for a good week before attempting to remove it?

Im thinking either a good pipe wrench or file some flats to fit a wrench on and see if it will break loose.
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Sparkitoff



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PostSubject: Re: Replacing a CVA Drum   Wed 16 Jan - 11:44

Some years they were press fit. Most go all the way through. I am interested in your conclusion.
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MattRaymond



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PostSubject: Re: Replacing a CVA Drum   Wed 16 Jan - 12:06

It might be quite difficult. They were installed and the threads go into the other side of the barrel, and then they were cut into for the patent breach. The replacement may involve drilling it all out and rethread the whole thing. Check with a guy named captchee on a forum called tradrag. I think hes done it and he could probably tell you how to do it.

Good Luck

Matt
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FrontierGander
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FrontierGander

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PostSubject: Re: Replacing a CVA Drum   Wed 16 Jan - 14:44

The older models go all the way through. This one just goes partially through like so,

Old style.


newer style
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FrontierGander
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FrontierGander

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PostSubject: Re: Replacing a CVA Drum   Sat 9 Feb - 17:12

Soaked it for close to 2 weeks in PB Blaster. I first tried unscrewing the drum but the metal was so soft it caved in on itself and so I cut it almost flush with the barrel and went to an easy out.

I heated up around the drum with a propane torch, installed the easy out and once it went all the way down flush, I cranked that sucker and the drum easily backed right out!




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FrontierGander
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FrontierGander

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PostSubject: Re: Replacing a CVA Drum   Sat 9 Feb - 17:16

Now this is the slight issue. I've done this before in the past by shimming with a brass or copper washer which did the job fine. I think I'd have to turn the drum down on a lathe in order to bypass the washer?


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Marty
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Marty

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PostSubject: Re: Replacing a CVA Drum   Sun 10 Feb - 10:43

FG, where can I get a double-handed cranking wrench like the one shown Question

My limited knowledge with these little hidden repairs always makes me nervous about buying a used sidelock.
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FrontierGander
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FrontierGander

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PostSubject: Re: Replacing a CVA Drum   Sun 10 Feb - 17:04

Marty, that wrench is from a threading kit I have. I'd imagine a search on ebay or amazon will turn one up.

I ended up taking the advice of the old gun builders and did it by hand this morning. I used a jewelers file and carefully turned the drum down until everything lined up perfectly after a good heavy seating of the drum against the barrel. Everything lined up perfectly, better than factory actually. Next I will proof it and then get it all sighted in. Its good to have this one back! Has the 1:32 twist 50cal barrel on it that shoots the real bullets like a dream.


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Marty
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Marty

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PostSubject: Re: Replacing a CVA Drum   Sun 10 Feb - 17:44

My eyes tell me i'd be happy with that line-up job. :rtup
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MattRaymond



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PostSubject: Re: Replacing a CVA Drum   Sun 10 Feb - 21:49

Nicely done
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Replacing a CVA Drum
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