Tuesday, September 30, 2008

Cleaning Up a Crosman 66, Part 2

Well, I didn't want to do a lot of work on the 66...

The transfer port is a somewhat restrictive .125" diameter, and the transfer port seal is .140"

So I drilled out the transfer port.

And the valve. I didn't bother smoothing, polishing, etc.

The cocking lever and spring goes in.

Then the rest of the trigger group.

I stuffed all the other bits in.

Then took it all apart as I forgot the plug that retains the shroud. It had fallen on the floor.

All back together. I put a cheap garage sale scope on it, as the rear sight is missing. The front bit of the handguard is missing as well. I checked out the velocities, with 7.9 gr. premiers it was shooting at 589 fps, 6 ft/lbs with 10 pumps, a bit slow from the advertised velocity of "up to" 645 fps. With 10.5 gr. premiers I got 521 fps, 6.33 ft/lbs, and with 15 pumps 567 fps, 7.5 ft/lbs.
Not that you're supposed to pump it up more than 10 times...

So now if one of my friends reveals that they are lacking a pellet gun, I have the perfect $6.00 gift to give them.

8 comments:

  1. i have found this to be really helpful, as i was having some problems with trigger assembly. how ever i am wondering if there is any photographic information on the pump action as i am loosing pressure while pumping; and seem to be loosing power in velocity i may get 2 strong pumps and then the little bung on the end seems to become detached.

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  2. Go to the Crosman site and download the EVP file that shows all the part numbers for the 66
    http://www.crosman.com/airguns/service/manuals/crosman-rifles
    , then call them up and order the pump cup (760-140) and pump piston (1322-B019). Likely either the hole the pump cup fits in is loose and the pump cup is bad. Replacing both should make it work much better. Probably a good idea to buy any other seals as well.

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  3. i was wondering if you could help me. in between the trigger group and "stuffed the rest of the bits in" you left out quite a bit. i was wondering if you could provide the other few steps. i got everything but cant figure out how to get the large piece you showed drilling out with the spring back in. please help. i found the schematic on the website but it doesnt show how it actually sits. please please help. i can email you pictures of whats giving me problems.

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  4. please help, in between the trigger group and stuffed rest of the bits in, i cant figure out how to get the piece you drilled out and the spring back in. i got the schematic but it doesnt show how it actually fits together. please please help.

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  5. I could use some tips for the order in which to put the gun back together. I am struggling with how to get the barrel, pump tube and trigger assembly in at the same time. Can you help?

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  6. Just read the first post in reverse order:
    http://anotherairgunblog.blogspot.com/2008/09/cleaning-up-crosman-66-part-1.html
    Otherwise speand some time studying the exploded diagrams.

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  7. Hey Nick! 2008? Are you still on here? I have an old Crosman 66 (Zinc receiver) and I am trying to figure out if the barrel shroud is blued or painted? Looks blued but want to be sure. Thanks, Steve

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