Crosman mark I seal sizes

[averagejoe]

Hello,

I just got a Mark I from the other forum and unfortunately the seal inside the piercing cap is toast. It must have split sometime during the winter.

Since I am really impatient at this moment and want to start shooting it what is the recommended type and size of seal/oring? I will probably be ordering a whole seal kit after but dont want to wait that long

[sholo]

Eric has the proper seal kit:http://scopesandammo.com/storefront/...seal-kit-p-582 But seeing as you're in a hurry , piercing cap seal is 1/4" OD x 1/8" ID x 1/16" thick (same as MK I bolt seal). You may find however, that if the piercing cap seal/o-ring is toast, the others may not be far behind, if they're not already. Don't be surprised if Co2 starts spewing elsewhere...

Myself, I would just get the whole seal kit from Eric. That way you are only tearing the gun down once, changing all seals, and spending more time shooting - not repairing one seal at a time (and waisting Co2 cartridges to boot!)

Good luck and keep us posted on your results!

Todd

[averagejoe]

Oh, I intend to do just that but those will take at least a week to get here and I have new toyitis baaaad I'm sure others know the feeling

And has anybody ever noticed that the image for that item with the 2 Mark 1s is the same image as on Tcoopers article, just flipped? And that one of them is actually a Ruger Mark I?

[Gippeto]

1/4 x 1/8 x 1/16 cross section is an 006 oring. Buna will be available at the hardware store...not sure how they'll last....but they're available...and cheap.

Handy little chart for ya...

http://www.broadleyjames.com/o-rings-size-chart.html

[averagejoe]

Thanks for that Gippeto. And not a single freaking 006 seal in the entire redneck town of mine! 2 hardware stores and an industrial supply store.

Hope the seal kit from Eric gets here fast

[Gippeto]

Just had to verify where you are....middle of freakin nowheres ville. Have an auto parts store? They usually carry o-rings too.

[averagejoe]

Just had to verify where you are....middle of freakin nowheres ville. Have an auto parts store? They usually carry o-rings too.

Feck, I didn't even think of that lol. Nasty cold seems to be blocking the rational thinking.

[averagejoe]

Well, the seal kit came in today and I took apart the pistol. The piercing assembly one was hard as a rock and split in half like a bagel. The others are all still soft, but a little dry. Will be replacing them anyways.

Included with the scopesandammo seal kit is a new valve stem with a plastic base. Is there any reason I should install this over the stock brass one?

[averagejoe]

Well, got it all back together. It is really quite easy. Low power will go though one side of a cardboard box, and high power will go though a few more than that. Hi power will put a CPHP about half the pellet depth into duct seal and will flatten it ever so slightly. Low power will just bounce off.