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 Post subject: Crosman 1400 Restoration
PostPosted: Mon Feb 06, 2012 8:45 pm 
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Location: Coalmont BC
About a year ago I bought this 1400 as a project (like I didn't have enough already).... I'm a sucker for the wood on these early Crosmans, you never know what's hiding under there.... I've already rebuilt a few 140s, so I'm familiar with what they need and like.... When I bought this gun the Ad said "nice brown patina" and I should have known what that meant....

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Actually the rust wasn't that bad, mostly in front of the stock where people have a tendency to pick up the gun when it's propped in a corner.... The wood is covered by Crosman's brown finish of the time but the grain underneath looks nice.... It wouldn't hold air for long and shot weakly (under 500 fps) so I pulled it apart just to diagnose it and found the quad seal leaking and replaced it.... That gave me a gun that would hold air and shoot typical of a gun of that age....320 fps at 2 pumps, 440 at 4, 510 at 6, 550 at 8, and 580 at 10 pumps.... The trigger pull was attrocious, but at least the metal trigger group on the 1400 is adjustable for pull weight where the 140 (which has the trigger mounted directly in the wood stock) was not.... I stripped the gun completely apart to start the rebuild.... Here are the parts of interest....

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Starting from the top, looking at the items circled in yellow....

The cutout in the pump tube is too far forward and if you don't pump the gun VERY slowly it doesn't take in air properly as the air has to draw into the pump along the raised channel.... This is a common problem where the velocity is low unless you wait a couple seconds at the end of each "out" stroke.... The solution is to lengthen the slot and deburr it carefully....

The pump cup is difficult to replace, and this one is quite hard.... My solution is to replace the end half of the piston with a new flat topped one grooved for an O-ring.... Easily replaceable, commonly available, and you can achieve higher pressures....

The rear of the valve only has a 1/8" hole in it.... I drill it out in stages to 5/32" to match the rest of the ports in the gun....

There is an aluminum spacer in the valve which takes up about half the volume.... This means that the pressure rises very quickly, but you will notice that you get most of the performance in the first 6 pumps.... With the "dump" style valve held closed directly by the sear, the higher the pressure the harder the trigger pull.... I will be replacing the short spring and spacer with the longer one underneath them.... The additional volume will allow more velocity at higher pump numbers with reduced trigger pull weight....

The hole in the flow-through bolt is only 0.140".... I drill it out to 5/32" to match the other ports....

The stock retaining screw in this gun wasn't all mangled by pliers, so it may never have been apart.... They are usually shredded by master craftsmen, however, so I mill two flats in the larger portion to allow the use of a wrench to remove and install....

Other than these items, everything will get a thorough cleaning, rust removal, and rebluing and then I get to tackle the stock....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
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PostPosted: Mon Feb 06, 2012 8:54 pm 
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Cool!! 8) Looking forward to following this one Bob. I have a couple that need some TLC as well.

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PostPosted: Mon Feb 06, 2012 9:49 pm 
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Location: Lower Mainland, B.C.
Hey Bob,
Glad to see that your ordeal hasn't slowed you down any. What an awesome, informative post this is, as usual,:).
Funny thing is that I am doing a Cr 1400 resto too! I bought this gun at the last FT shoot in Mission, it pumps hard and shoots hard, so I think I will leave the valve alone for now. The stock and forearm were pretty beat up with the usual dings and scratches.
So I took the old finish off, spent the afternoon sanding with various grades and finished the prep with 000 steel wool till it shined.
Then I genorously applied Watco Danish Oil, dark walnut colour, one step with varnish, wiped it off, and let dry. The grain seems to pop right off the stock! I too love the old Cr woods. I'll let it sit for one more day, and reassemble tmrw after work. Here's the pics.......
Image
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PostPosted: Mon Feb 06, 2012 10:08 pm 
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Nice job on the stock.... a little blonde for my tastes, I'll be using a darkish stain before the Dark Walnut Watco Oil.... Beautiful piece of wood, though....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Mon Feb 06, 2012 11:12 pm 
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Location: Lower Mainland, B.C.
Thanks, I would have liked a little darker too, but I'm starting to like it. :)

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PostPosted: Mon Feb 06, 2012 11:49 pm 
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when I saw this post I missed my old rifle but then seeing the job bullseye is doing and knowing my new one is on the way
all is good 8)


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PostPosted: Wed Feb 08, 2012 6:10 pm 
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Over the past couple of days I have been working on the modifications I wanted to do and rebluing all the metalwork.... Every single piece was cleaned, degreased (twice) and reblued with Van's Gun Blue.... There were a lot of small pieces....

Image

In addition I reblued the barrel, main tube, and pump linkage.... In the photo above you can see the new piston with O-ring (top right), and just below it the stock mounting bolt with the flats milled in it (hard to see).... Once everything was finished and oiled lightly I reassembled the gun and ran a few pellets through it....

Image

If you compare the photo above to the first one in this thread, you can see the improvement.... I was quite pleased with the increase in performance as well.... 2 pumps gave 305 fps, 4 gave 442, 6 was 534, 8 was 588, and 10 pumps was 620 fps.... The gun now shoots harder at 8 pumps than it did originally at 10 pumps.... and the trigger pull is much lighter as well.... I'm quite pleased with the results.... Now to get on with refinishing the stock....

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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 Post subject: Crosman 1400 Restoration
PostPosted: Wed Feb 08, 2012 7:19 pm 
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Location: Calgary, Alberta
Wow, that is very impressive!!

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PostPosted: Wed Feb 08, 2012 8:36 pm 
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Location: Southwestern Ontario
I have never seen an aluminum spacer inside the valve as you have. Neither of my two 1400's nor the 140 have it.

Did you thread the end of the piston pump assembly (circled in the photo below) then install a short tapped aluminum piece grooved for an oring, or how did you come up with the new piston end?

What is the weight of the pellet you are using for your FPS reference?

Image


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PostPosted: Wed Feb 08, 2012 8:50 pm 
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rsterne wrote:
Over the past couple of days I have been working on the modifications I wanted to do and rebluing all the metalwork.... Every single piece was cleaned, degreased (twice) and reblued with Van's Gun Blue.... There were a lot of small pieces....

Image

In addition I reblued the barrel, main tube, and pump linkage.... In the photo above you can see the new piston with O-ring (top right), and just below it the stock mounting bolt with the flats milled in it (hard to see).... Once everything was finished and oiled lightly I reassembled the gun and ran a few pellets through it....

Image

If you compare the photo above to the first one in this thread, you can see the improvement.... I was quite pleased with the increase in performance as well.... 2 pumps gave 305 fps, 4 gave 442, 6 was 534, 8 was 588, and 10 pumps was 620 fps.... The gun now shoots harder at 8 pumps than it did originally at 10 pumps.... and the trigger pull is much lighter as well.... I'm quite pleased with the results.... Now to get on with refinishing the stock....

Bob

My stock Sears 1400 is getting 626 fps @ 8 pumps and 656 fps @ 10 pumps ,One of the problems of increasing pump pressure is the wear on the pump hinge and there getting hard to find so IMO i would not be in a big hurry to try and get much more out of these old guns ,I like the new piston i was never a fan of the crosman pump cup ...........this little vid is a worn pump hinge the go fast from this point Image


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PostPosted: Wed Feb 08, 2012 11:40 pm 
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It seems to be a 50/50 kinda deal on the aluminum sleeves.... Of course somebody may have already removed them....
I simply drilled a piece of 3/4" aluminum rod to 5/16" and pressed it on.... then turned it down and machined an O-ring groove in it....
I'm using 14.3 gr. JSB Express pellets for my testing....

I got the old brown finish stripped off the stock today.... Pretty nice grain hiding under there....

Image

Staining and sanding tomorrow, hopefully....

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Sat Feb 11, 2012 4:54 pm 
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Location: Coalmont BC
Here is a photo with the Dark Walnut stain done....

Image

If anything, the contrast will increase with the Watco Oil Finish when I rub it out....

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Sat Feb 11, 2012 10:28 pm 
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Joined: Sat Mar 12, 2011 10:19 pm
Posts: 120
Location: Lower Mainland, B.C.
Awesome job! Looks pretty close to mine. Cr 1400's are an actual quality rifle, I think. Would be cool to figure out how to put a scope on it.

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PostPosted: Sat Feb 11, 2012 11:09 pm 
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bullseye wrote:
Awesome job! Looks pretty close to mine. Cr 1400's are an actual quality rifle, I think. Would be cool to figure out how to put a scope on it.

Buy a sear 1400 there grooved for a scope........
Image


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PostPosted: Sun Feb 19, 2012 3:00 pm 
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The restoration of this Crosman 1400 is completed.... The stock received seven coats of Watco Dark Walnut Danish Oil, each coat wet sanded ending with 600 grit.... It was then waxed with Dark MinWax, three coats.... which resulted in an incredibly smooth finish with a medium gloss.... Here is the results....

Image

Image

In addition to the rebluing, detailed above, the ports have all been brought up to at least 5/32" and the resulting velocities are 515 at 5 pumps, 610 at 8 pumps, and 660 at 10 pumps.... The trigger pull is much lighter than it was to start with, although it is very long.... I'm extremely pleased with the way it turned out.... especially when you see what I started with in the first post.... :mrgreen:

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


Top
 Profile  
 
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