Rebuilding a Crosman Mk1

[Red_Ryder_Sniper]

I believe this would be the correct thread, if not please move it to the appropriate location, thank you.
I won an auction for a working mk1 a while back, when I got it, I could hear it leaking so I put it to the side until I could figure out what to do with it. After quite a bit of looking I ordered a regular set of walnut grips from Vernon Austin and a rebuild kit from mac1, also an Ld probe? The probe may be a waste of money, but I ordered it anyway while I was there.
While looking for parts I have came across lots of cool mk projects and I will probably pick up another when I can for a more in depth build, but I really just want a nice pistol for shooting snakes and targets with this build. Seems like the barrels that came in these would be fine and they don't really need much to be a great shooter?
First order of business, any opinions on the best way to get a factory style refinish? Powdercoat seems like it would be toughest?

 

[borne2fly]

I've fiddled with these a bit.
Here are two Mark 1's.
One is stock, the other has a steel barrel shroud and an extended barrel.

Powdercoat would be super tough.
However, I will just use epoxy paint if I ever re-do these ... tough enough and easy to touch up (my guns always seem to pick up little nicks over time).
Any small parts you can replace with steel is money well spent (bolt, bolt handle, trigger, etc.).

 

[JayDee24ca]

I have powdercoated a few of my Mk1 and it worked out very well. I use a satin black or a gloss black, depending on my mood at the time, they are both good. I thought about painting them other colours, but decided the guns are too nice to tart them up. Us paint stripper to clean the original coating off, then steel wool, wipe well with alcohol, wear gloves so you don't get skin oil on the casting. It takes me a couple of hours start to finish.

 

[Red_Ryder_Sniper]

Tried to reseal it and can't get something right. It leaks all the c02 out immediately

 

[borne2fly]

Tried to reseal it and can't get something right. It leaks all the c02 out immediately

Is it leaking out the barrel? Or out the CO2 cap? Or internally?

 

[Red_Ryder_Sniper]

Been a little bit since I had it out but it was either internally or out of the barrel, been a few months ago, I got tired of messing with it. I tried heating it with a hair dryer but that didn't help

 

[borne2fly]

A leak out the barrel would imply a leaking valve. Those parts are available. However, getting the valve body out takes some patience and fiddling. If it’s leaking out the CO2 cap then it’s just an o-ring … much easier

 

[Red_Ryder_Sniper]

I removed the valve body and replaced the o-rings, im assuming i didnt get something back together right. It was very hard to push the valve back in.

 

[vintageairguncollector@gm]

Mechanical things and peolpe break when to much force is applied. Calcification causes parts to stick togehter I always clean the inside too.

RRS try again and be gentle. My Croman 157 took me 11 attempts before it worked. I always video the teardown and align pieces with a number for each. Some airguns seem to need more attention.

Good luck

 

[borne2fly]

Hmm, the valve should move quite easily before you install the spring. After that it should take a good push to but it should still move in and out.

 

[borne2fly]

Oh, hang on ... I got ahead of myself talking about the guts of the valve.
I think you removed the valve body and replaced the o-rings but didn't go inside the valve, is that right?

 

[borne2fly]

Take heaps of pictures when you pull it apart. After rebuilding countless engines I have made this a habit.
And never delete those pictures ... I print 'em out and keep them in 3-ring binders.