Cylinder Fitment

[armorer951]

George,

I'm puzzled about the statements that the Numrich rep made in terms of the specifications and length of the cylinder itself. My new 648 cylinder from Numrich measures 1.623". The cylinder in my 60's era model 17 measures 1.620". All of the "rimfire" cylinders, including the 22 magnum cylinders are recessed.

In terms of fitting, and aside from the gas ring discrepancy, the cylinders are basically the same. There is the added burden of individually fitting/cutting each of the ratchets, but other fitting issues that came up were easily accommodated, as Stu has stated above.

Carter

 

[georgek472]

Cylinder fitment

armorer951
Carl, Thanx for the measurements on the .22 LR and .22 Mag cylinders..You have answered my next question about cylinder measurements... I suspect the c/s reps at Numrich have limited information, maybe not. I have made progress on finding several Knowledgeable, hands on experience, and fairly reasonable gunsmiths who have done this procedure. The only problem they ALL had was the cylinder lengths from Numrich
648 mag 1.61"... LR..1.68".... Obviously wrong numbers from Numrich..Thanx for the response...Best; George K.

 

[georgek472]

stu1ritter,
Nice work....... Best...George K.[
Stu,
Any thoughts on bore diameter .22lr vs..22mag. Thanx..George K

 

[armorer951]

George,

Reference cylinder and pressure measurements, see post 7........


http://smith-wessonforum.com/s-w-ha...632157-impractical.html?632157=#post140937989

 

[stu1ritter]

Here are the spec's..........I haven't given it all that much thought.

.22LR Bullet dia. .2255, bore dia .217, groove dia. .222
.22Mag Bullet dia .2245, bore dia .219, groove dia. .224

I'm not too concerned.

Stu

 

[georgek472]

Cylinder fitment

Nice work....... Best...George K.[/QUOTE]
Stu,
Did you have to shorten the injector rod ?? Or the one that came with cylinder was the right length...Thanx.. George K

 

[stu1ritter]

The cylinder came with the ejector and that was all. I had to order the ejector rod, center pin, collar, center pin spring and ejector spring (about $25.oo). I'll fit them when I get them this Saturday (according to Brownell's). Those are pretty simple to fit.

Stu

 

[georgek472]

Cylinder fitment

Here are the spec's..........I haven't given it all that much thought.

.22LR Bullet dia. .2255, bore dia .217, groove dia. .222
.22Mag Bullet dia .2245, bore dia .219, groove dia. .224

I'm not too concerned.


Thank you for your response.. This "hands on"info will go a long way.. Thanx..... George K.

 

[georgek472]

Cylinder fitment

Stu,
Thank you for the "hands on" numbers...They will go along way in my efforts....Thanx again....George K.

 

[georgek472]

The cylinder came with the ejector and that was all. I had to order the ejector rod, center pin, collar, center pin spring and ejector spring (about $25.oo). I'll fit them when I get them this Saturday (according to Brownell's). Those are pretty simple to fit.

Stu, Thanx again for your help.... Please let me know when you can, about the ejection rod once you have it fitted. It would be nice to have the rod fit as is...Good luck with your install....
Best; George K.

 

[stu1ritter]

George, parts showed up from Brownell and are fitted. While all the instructions say to not shorten the center pin, I had to. Not much about .030" and the ejector rod had to be shortened slightly and chamfered on the inside to make it easier for the ejector rod end to pass off the locking bolt when opening. It was a quick touch of the center pin on a fine grinding wheel and then polished on emery paper. Slight chamfer on the locking bolt end of the center pin. Probably took 15 minutes. I'll start cutting ratchets tomorrow.

Stu

 

[georgek472]

Cylinder fitment

stu,
Thanx for the pic...looks awesome... Looks like fitment, including ejector rod was successful..Congrats. After reading your post, seems like ejection rod fitment is relatively easy. I will have my parts from Numrich,and Brownells the upcoming week... I hope your complete install goes well... Looks and sounds rewarding after all your work. Thanx again for your info. Best to you..George K.

 

[stu1ritter]

All done. As Carter said, I lucked out. I put a spot of Dykem on the ratchet face and scribed a light line through the frame hand window on the inside vertical face which would be where the hand would pass the ratchet tooth as it was cycling into place. When I took the cylinder out there seemed to be very little material to remove so I just took a few file strokes and put it back in to check and the hand almost cleared the tooth. Did it again and it cleared and worked. I did the other 5 ratchet teeth and put the gun together and with some empties in the chambers cycled it through twice in double action. A little stiff on two chambers but that will clean up when I stone the teeth smooth from the filing. Took it to the range and fired half a box of 50 CCI HP-V rounds. There is a nice blue flame at the muzzle of this 4" pre-18 with these rounds. This was a very enjoyable project and a great learning curve. Ratchets and timing always seemed to scare me away but after doing one, it is pretty straight forward. Kuhnhausen's shop manual has a lot of info on ratchet fitting and timing for anyone contemplating this process. Thanks Carter.

Stu

 

[steelslaver]

Excellent work. Glad it worked out for you and that you gained some experience on the project. When I cut the ratchet teeth to fit a recessed model 29 cylinder that had been reamed to 45 colt I was nervous in the beginning , but itt worked out.

To me working on them can be as interesting as shooting them. In fact I spend more time tinkering that shooting.

 

[georgek472]

Congrats Stu,
Thanx to you and Carter I feel more comfortable with my fitment knowing that this procedure has been successfully completed by two (2) members here. I hope to get lucky with my install, which will happen in a few weeks. Waiting on Numrich and Brownell's for parts... Thank you all for your help and information...Best George K..

 

[georgek472]

Cylinder fitment

Stu. I ordered 2 extractor rods from Brownells, (Numrich had nothing in stock). The ones I ordered are both too short.
#940 074 830--- bbl over 3"
#940 070 500 --- bbl over 2 1/2"
Would you know the correct p/n ??
Brownell only lists the above 2 items.
My #17 is 8 3/8' barrel...
Thanx Again for your help...George K.

 

[stu1ritter]

The part I ordered was S&W 070050000/Brownell 940-070-500WB which is the correct number for the 648. The other number you ordered seemed to be for stainless N frame revolvers. In my S & W parts catalog (factory) the only stainless extractor rods shown for 617 are the 070050000 which you have and the 077590000 which Brownells shows as their 940-000-241WB Extractor Rod, Glass Beaded, SS.

Is your model 17 a left hand threaded extractor? Does that rod fit?

Stu

 

[georgek472]

Cylinder fitment

Good morning Stu,
Thank you for your response regarding the correct p/n for the extractor rod.. I I suspect the rod is left handed thread if that is standard for that item from S/W..Still trying to remove from cylinder without damaging the knurling... I will try again or I will call S/W....
Sorry to respond late to your message I ve been fighting the Flu.. Thank You again for your help...Best; George K.

 

[georgek472]

Cylinder fitment

Stu,
Was able to loosen the extractor and fit the new s/s #648 extractor... It fits properly and locks into place. Guess I got lucky !!..... George K.

 

[stu1ritter]

I would have thought that the 070050000 was the right one for your K frame. That is the correct part number for the 648 K frame who's cylinder we are using. Sounds like you didn't have to do any end fitting at all. Nice.

Stu