GTA
Airguns by Make and Model => Crosman Airguns => Topic started by: stonykill on December 11, 2014, 08:00:21 PM
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I picked one up at a tag sale over the summer. As it pumps it leaks air. Before disassembly I thought it was leaking out the transfer port. I guess before I continue, this is my 1st pumper total teardown.
Once disassembled I notice each pump it leaks air. Gun apart, just pumping the pump tube and listening. So I'm just guessing here but thinking the valve must be stuck, dirty , something. I time permits I'll drive out the pin and take the balance apart.
But on to the question. Anything in particular I should look for, known issues, basic improvements etc? TIA
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I picked one up at a tag sale over the summer. As it pumps it leaks air. Before disassembly I thought it was leaking out the transfer port. I guess before I continue, this is my 1st pumper total teardown.
Once disassembled I notice each pump it leaks air. Gun apart, just pumping the pump tube and listening. So I'm just guessing here but thinking the valve must be stuck, dirty , something. I time permits I'll drive out the pin and take the balance apart.
But on to the question. Anything in particular I should look for, known issues, basic improvements etc? TIA
Sounds like the pump cup and/or the valve stem is bad.
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Mine is cursed I just can not get myself to let it keep the good parts... I guess I just do not like the plastic receiver... and in all of its incarnations I was just not able to get it to be accurate to 30 yards even with a 7/16 barrel..?
The 2100 has the same sealing probs in the firing cycle but more worth fixing and usually easy to get accurate.
the clam shell guns tend to leak at the bolt and I sometimes build them up with superglue to custom fit.
they also tend to leak at the transfer port...
I find the best way to fix them is to make them something else...
as far as where its leaking on yours the pump cycle is the same as a 13xx two O-rings and two poppets same reasons to have probs as a 13xx.
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Thanks Kirby. I thought it was the same as the 13xx valves. I'll take care of that 1st, then see what I get. I have looked at all of the threads you linked me to the other day, and may at some point donate this pump tube to my 2289. In the mean time I want to get this up and working and see what I have. If I cn get accuracy 18 to 20 yards I'll be happy.
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Yesterday I put new orings in the valve and a new transfer port seal in it. Wow I like this 66. At 18 yards and a little pellet experimenting I got almost to nickel sized groups with Winnie domes. I have yet to recrown the barrel. So there is still room for improvement, and I still have more pellets on hand to try. So pretty happy for a tag sale find.
Might play with this one a bit, stuff the piston etc.
After I do the same to the metal receiver 760 $1 tag sale find
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i gave up on mine... it is accurate but the fastest it will ever shoot is 520 fps no matter what i do to it... super frustrating...
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I don't have a chrony and haven't even done penetration tests yet. My backstop was your typical magazine and pellets went through. I know just from that it will be a great rabbit gun
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I have a Recruit that is the same thing with a different stock, I put a flat top piston and valve in it along with a few other things and I got it to do one shot at 720ish FPS at 15 pumps, and a second shot at 550fps. Yes it retains air but it has a backup shot this way, with the pellet clips it's handy...
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Yesterday I brought the 66 to my 15 yard range with a 1/2 inch plywood backstop. My main hunting kill is around 15 yards, so I like to be zero'ed in there. And now I am disappointed inthis ag. Back to the drawing board for sure.
I shoot, walk to the target, see the hole in the paper and no pellet. Go back, sit down do it again. Same result. This was at 10 pumps. so I pump 15 times. Finally the pellet sticks in the plywood, most of the time. Sometimes just dents it.
So I go inthe house and grab my bone stock internally 880. Use the same Winnie dome pellets. Take 10 shots at 10 pumps with the 880. Every domed pellet is buried fully in the 1/2 inch plywood.
so my 66 is dead on accurate, but lacks power. Very disappointed. I don't target shoot. I hunt. So I guess I need to mod it up just to get to the power level of my stock Daisy 880. Oh well......................
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davids is the only one i know that has been able to get power out of the 66... mine is the same, 760 power in a 2100 sized package with rifled barrel... not strong enough. for that kind of power the 760 is way more practical and it forces me to take only short distance shots.
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Ok, question for ya then. Should I move the 66 pump tube over to one of my 760's? The 1975 needs to be rebuilt anyway, and has a metal receiver. In theory it should pump to more power. But then it may not make a bit of difference as the only differences I see between the 760 and the 66 are the pump tube assm and the barrels
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try it... i think the 75 760 was still a cock on pumping gun, no? if so that wont work... otherwise it should. By the way, your 1997 is sick!!! that is the 760 i like the most... i cant get myself to buy the new one... I like that lego brick pump arm...
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davids is the only one i know that has been able to get power out of the 66... mine is the same, 760 power in a 2100 sized package with rifled barrel... not strong enough. for that kind of power the 760 is way more practical and it forces me to take only short distance shots.
Well now my 66 is just parts for my 2289's, began adapting the pump tube today to do an MLT 2289 :) .
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not a good sign... powermaster 66 are falling like flies... I actually built mine from a 5 shot clip to a single shot... maybe my problem is that the air is blowing by the bolt once closed as it has no o ring... I dont know, i am done with it, it shoots like a 760 so i rather built a 760 instead...
PS: with 16 millions of the suckers around, i am having a hard time finding a lego brick forearm 760 for sale... not even picky about the rifling...
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try it... i think the 75 760 was still a cock on pumping gun, no? if so that wont work... otherwise it should. By the way, your 1997 is sick!!! that is the 760 i like the most... i cant get myself to buy the new one... I like that lego brick pump arm...
could be a year or 2 off with my memory. But it looks the same as the 97 but metal. And a metal bolt. It cost me a buck. :D
(http://i169.photobucket.com/albums/u215/stonykill/DSCF3302-001_zps8679ab23.jpg)
Thanks on the 97! I really like that gun. I bought it new when my son was little to shoot with him. I filled the stock with silicone, the camo tape, and this scope temporarily. It's only a $20 fleabay crossbow scope with home grown camo, so it may stay and that crossbow can get another one. It does fit the 760 really well.
I am tempted to buy the newest design 760. But I'm a little scared to. Afraid I'll be disappointed.
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that is a variant 2... 1973 or 74. is the self cocking one so it wont match. still worth resealing though!!! that is a toughie. The new one supposedly shoots faster and is easier to pump. The easier to pump i believe is because you have a longer pumping forearm and there fore more leverage... the extra speed i am not sure about. no one has posted a review on it yet... that i know of. Plus the old one has that air of familiarity... you know, like an old jeep. It may not win any beauty contest, nor be very comfortable... but you'll never get stuck (if you do you shouldn't have driven there to begin with...lol)
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I see said the blind man to his deaf dog as they crossed the street. As my grandfather used to say :D
Then a reseal it will be.
I am also hesitant on the new 760 as I prefer the single shot over that plastic pellet magazine. I just KNOW I would keep losing them. But still, I'll probably get one...after a Daisy 901 and 35 ;)
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The powermaster 760 in question has the metal receiver, plastic stock and pump arm, bolt rather than a roll pin in the tube and is serial number D75079247. from what I am seeing on the crossman site that makes it a 75?
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i may be wrong... is the bolt brass? does it click when you pull it back?
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I think I'm wrong. ;) The bolt appears to be brass and no the bolt does not click when you pull it back. Don't have to move the bolt, just pump fire, pump, fire. So I'm saying that is self cocking
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... is it rifled? if so its definitely worth re sealing...
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Dec. 75. ;) So yes it is a self cocker, and is most likely smoothbore. 66 pump tube will not work. :(
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Dec. 75. ;) So yes it is a self cocker, and is most likely smoothbore. 66 pump tube will not work. :(
yes, on all counts ;). Self cocker, smoothbore and the date.
I think I have another 760 barrel. It either will go on the 66 or the 66 pump tube will end up on my 2289. Not sure yet. I do plan on resealing the old 760. Nice solid gun
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I decided to revisit the 66 again last night. I had to decide if it was being torn down for other projects or if I could get it up to snuff. I personally prefer the way these rifles feel over the 13xx carbines but if I could not get the 66 to work the pump tube was going on a 13xx.
Last night I tore it back down. I flipped the breech seal and lbed it with a huge drop of 30wt nd. Thisnext part may be SOP and I just didn't know it, but here is what I did. I pushed the breech block at the end of the straw barrel into the pump tube seal. Then took several wraps of electrical tape around the straw barrel and the pump tube to firmly hold them together for the tightest possible fit.
resighted it in this am and as before it is silly accurate at 15 yards. 5 shots is a ragged 3/8th inch hole. Then I shot the Winnie dome pellets into the 1/2 inch plywood that before the 66 would only sometimes penetrate with 15 pumps. At 10 pumps and from 15 yards the Winnie dome pellets penetrate the 1/2 inch plywood deeper than the skirts. So I was clearly losing air at the most crucial point inthe system. Right before the pellet.
So now I am happy with the performance. It now also has a wood pump arm. Painted black. The stock is filled with silicone. Once I settle on optics for it it will get a camo paint job and be a good nutter/rabbit weapon.
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I decided to revisit the 66 again last night. I had to decide if it was being torn down for other projects or if I could get it up to snuff. I personally prefer the way these rifles feel over the 13xx carbines but if I could not get the 66 to work the pump tube was going on a 13xx.
Last night I tore it back down. I flipped the breech seal and lbed it with a huge drop of 30wt nd. Thisnext part may be SOP and I just didn't know it, but here is what I did. I pushed the breech block at the end of the straw barrel into the pump tube seal. Then took several wraps of electrical tape around the straw barrel and the pump tube to firmly hold them together for the tightest possible fit.
resighted it in this am and as before it is silly accurate at 15 yards. 5 shots is a ragged 3/8th inch hole. Then I shot the Winnie dome pellets into the 1/2 inch plywood that before the 66 would only sometimes penetrate with 15 pumps. At 10 pumps and from 15 yards the Winnie dome pellets penetrate the 1/2 inch plywood deeper than the skirts. So I was clearly losing air at the most crucial point inthe system. Right before the pellet.
So now I am happy with the performance. It now also has a wood pump arm. Painted black. The stock is filled with silicone. Once I settle on optics for it it will get a camo paint job and be a good nutter/rabbit weapon.
Great. Reading this thread almost makes me tempted to look at the 66 again. I think I have all of the parts to put at least one together, though I will have to give it a closer look (if I decide to do so). Though that will not be for a long while even if I do decide to do it, the Daisy 880's are my primary project at this time.
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Hope this isn't a double post, my first one never made it to the thread!
I read with interest your experience with an older 66. So happens my grandson got one for Christmas, older metal receiver, with 66AB on the side, rifled barrel , plastic butt and fore arm, and in excellent mechanical shape. We decided to open it up, clean and lube and check the pump cup. Everything was in like new condition. We opened and cleaned the valve, relubed and reassembled it.
We stuck an old Beeman 4x32 blurry cheap scope on it and sighted it in at 15yd. Only had a Dasey variety pack with pointed, HP and wadcutter in it to choose from, did much better with the wad cutters. Could keep them in a dime easily at 15 yds, even tho the target was blurry.
Was extremely pleased with that accuracy , so we chronied it and it did 635 consistently with the cutters.
I hate to spend for a better scope, but we are used to mildots for different yardage on our backyard range--- this little gem deserves a better scope!!!!
I'd love to put on a crosman recruit adjustable stock on it, it's a bit long for the g/son for now, that'd be cool but more$$$.
What do ya think a better pellet would be???
Any how, like you, I discovered, this thing turned out to be a sweet surprise !!!!!!!!!!!!!!!!
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Mine does well with Winchester domes and with Crosman boxed domes 10.5's. I have only run a few types of pellets through mine, and being it shoots the dirt cheap Winchester dome 9.68 pellets I stopped looking for a different pellet. My local TSC's sell the winnie domes for $5 for a tin of 500. hard to beat!
And yes I am just using a cheezy 4 x 15 Daisy scope on mine right now. It needs better inexpensive optics. With the accuracy it deserves it.
I have not measured the stock length on my 760's but I beleive it is a shorter stock than the 66 has, which may help your grandson. They are dirt cheap on fleabay
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I just measured the 66, it's right on 14" LOP.
I have a $44 Hammers 3-9x32 AO on a hpa converted qb79, I don't recall finding a AO scope any cheaper. It's been a solid scope for over a year. for the price, a good buy
Hey you're in East Chatam-- the cape??
I'm in NH, hi neighbor!
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I just measured the 66, it's right on 14" LOP.
I have a $44 Hammers 3-9x32 AO on a hpa converted qb79, I don't recall finding a AO scope any cheaper. It's been a solid scope for over a year. for the price, a good buy
Hey you're in East Chatam-- the cape??
I'm in NH, hi neighbor!
In Ny. Lots of Chathams on the east coast.
I have a nice crossbow scope on one of my 760's and it is perfect for these short range hunters.
I will stick to a fixed scope for my 66. Short range weapon so for me anyway's a 4 x 32 short scope will be perfect.
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Mounted a better scope on it just now. I'll sight it in tomorrow and see how I like it. Same scope as on my 880 so I should be pleased. If I like the outcome all that will be left is the camo paint job. Also finally looked at the serial number. Sept 1995 manufacture
(http://i169.photobucket.com/albums/u215/stonykill/DSCF3657-001_zps473621b6.jpg)
(http://i169.photobucket.com/albums/u215/stonykill/DSCF3658-001_zps886d7e74.jpg)
The camo paint job will look similar to this on my Frankie Crossbow :
(http://i169.photobucket.com/albums/u215/stonykill/DSCF3600-001_zpsc50175d5.jpg)
Rewinder, i just compared stocks and the 760 stock is only about 1/2 inch shorter than the 66 stock
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The Recruit stock is about 2" shorter fully compressed than a 66 stock, the recruit and 66 are the same thing other than the Recruit being smooth bore, if you order the Recruit stock from Crosman's parts department it would probably be cheap and $4 shipping. I have 4 66's and 2 Recruits... If you want I'd trade a Recruit stock for your 66's stock... especially if yours is the black variety :)
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I was not happy with the scope mounts. They did not mount square enough to the receiver making way too much scope adjustment to zero. So I took the rear sight off of my Hatsan 1000s Vortex .22 which I have scoped and mounted it, and a brass pin on the front. Really happy now. All dialed in and at15 yards I'm doing 3/4 5 shot groups. I'm out of open sight practice ;) . A few days of open sight practice with this and my Daisy 35 should straighten that right out :D
Next... Camo. :D
I'm actually thrilled with my filled stock on my 66 Scott. Fits me well.
(http://i169.photobucket.com/albums/u215/stonykill/DSCF3660-001_zpsbd6c5831.jpg)
(http://i169.photobucket.com/albums/u215/stonykill/DSCF3661-001_zps8576f1c2.jpg)
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For some reason it looks white in the pics. It is khaki colored
(http://i169.photobucket.com/albums/u215/stonykill/DSCF3663-001_zpsdcfe481d.jpg)
(http://i169.photobucket.com/albums/u215/stonykill/DSCF3666-001_zps92126258.jpg)
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It looks ugly in the pics ;D But khaki would make it look better. Good job!! ;)
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I was referring to Rewinder wanting a Recruit stock, yours looks fine, and on an adult there's no real advantage since the LOP at the full extended point is exactly the same...
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I was referring to Rewinder wanting a Recruit stock, yours looks fine, and on an adult there's no real advantage since the LOP at the full extended point is exactly the same...
Got my people confused :o
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measured my grandsons LOP, 12" will do the trick, so got a list of recruit parts to order from crosman.
tried some tractor supply winchester domes and they did well.
I think he's going to have more fun with this 66 than he did with the crosman raven, handed down from is older brother.
Plus maybe I can keep him off my hpa rigs haha
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@stonykill:
Ok you did it to me. I just spent half an hour digging through my parts and throwing a 66 together from spare parts.