Crosman 140 valve disassembly

[TerryM]

  Working on an old 140, got it all torn down except for the valve.  Front part is aluminum, back part is brass.  Cannot get them separated.  Any ideas how to proceed?

[oldnamvet]

I'd try putting it in a freezer for a while.  That might loosen them up a little.

[Rob112o]

That, and give it some taps with a hammer. Try some PBblaster too. If all else failed you may have to put some pliers to it.

[Big Bore Bart]

If you have a lathe, chuck the brass half up, and use channellocks padded with leather on the aluminum.   There is some form of threadlocker in there.  Heat will help to soften it.

[oldnamvet]

Strap wrenches might also work and would not mar the metal.

[TerryM]

  I've put it in a padded vise, gripped the front half with leather padded vise-grips.  Heated a couple of times with a torch lighter.  That booger is stuck.  Might try more heat, tomorrow. 

[Mackado]

On my 4th variant with a frozen valve like yours I tried with a mini-vise and strap wrench without luck, then I squirt some liquid wrench and let it seat for a while and used channel locks padded with rags and a piece of non-slip rubber pad under, the one used in Kitchen cabinets' shelf, re-installed the 'retaining screw' on the 'check valve body' half for leverage and to keep it from spinning, tried a couple times by hand, and it worked, apparently the aluminum gets very corroded when in contact with Brass, I had to use a dremel with wire brush tool to remove all the gunk..

Hope it helps..

[Cloud 9]

Use more heat!  A propane torch will probably be required. The seals inside will be ruine and need replacing.

[Big Bore Bart]

 The threadlock compound needs to be 350+ F before it will degrade enough to let go.   The valve needs to be unscrewed while still hot.

[TerryM]

  Thanks for all the tips everyone, I'll let you know how it turns out.

[ped]

a set of collets are handy for separating valves I use the lathe chuck and an er40 collet set but you can get collet blocks that can be gripped in a vise

[TerryM]

  It's not coming apart.  Ordered a replacement assembly from Rick at Precision Pellet.