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Removing barrel cam

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bbrown
Oberfeldwebel
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Removing barrel cam

Postby bbrown » Mon Oct 06, 2014 4:48 pm

How do you remove the pin that holds the cam to the barrel? Does it simply punch out, or do you drill it out, or what?

Then how does the cam separate from the barrel?

I want to remove a cam from the stub of an 8mm barrel and install it on a barrel chambered in .308.

Thanks,

Bryan

Blanksguy
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Re: Removing barrel cam

Postby Blanksguy » Mon Oct 06, 2014 7:07 pm

Hi Bryan,
The MG34 Barrel-Extension is removed by first, removing the pin (if used)........the pin is installed and then flair out on both ends so that it won't move during firing. Either use a smaller pin-punch to tap it out (to be able to re-use it)....or drill the end out and then punch out the pin.

The barrel-Extension is then screwed off as a standard thread pattern (counter-clockwise off.....clockwise on).

If not reusing the retaining-pin.......use a "Dremmel-tool" and make a small notch on the contact-surface between the barrel-body and barrel-extension is that once re-installed, you can center-punch the barrel at the notch so that it won't back-out.

Regards, RichardS
US Army, Retired
Blanksguy2001@outlook.com

bbrown
Oberfeldwebel
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Re: Removing barrel cam

Postby bbrown » Thu Oct 16, 2014 8:05 pm

Sorry for the tardy reply, the cut barrels with extensions just arrived today. As instructed I punched out the retaining pins with little difficulty.

Thinking about trying some strap wrenches to unscrew the extensions.

Thanks,

Bryan

42rocker
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Re: Removing barrel cam

Postby 42rocker » Fri Oct 17, 2014 12:49 am

Some pics would be great.

Later 42rocker

Blanksguy
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Re: Removing barrel cam

Postby Blanksguy » Fri Oct 17, 2014 11:50 am

Bryan,
I have taken several of these apart (when needed) during the manufacture of 2-pcs. Blank-Barrel-Assemblies.
Other things that you can try are a heavy-duty vise with good/curved clamps to prevent the vise's jaws from cutting the barrel's outside surface......like good "Barrel-Blocks".

Heating of the barrel-extension slightly sometimes assists (with a couple drops of penetrating-oil) ...... but often it is just a good strap-wrench (or even a large adjustable wrench) that will break the extension loose from the barrel. Once loose, they just spin off by hand.

In extream cases, I have used a brass-drift and BFh (large hammer) to smack the flats of the barrel-extension to assist in loosening it up.

Regards, RichardS
US Army, Retired
Blanksguy2001@outlook.com

bbrown
Oberfeldwebel
Oberfeldwebel
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Re: Removing barrel cam

Postby bbrown » Fri Oct 17, 2014 4:15 pm

Here are some pictures. Pins are out, but haven't gotten them unscrewed yet. 'tis a pity the barrels were torched, there are some nice markings on them.

Bryan
Attachments
side2.jpg
side1.jpg


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