Smith & Wesson Forum

Go Back   Smith & Wesson Forum > >

S&W-Smithing Maintenance, Repair, and Enhancement of Smith & Wesson and Other Firearms.


Reply
 
Thread Tools Display Modes
  #1  
Old 02-19-2011, 07:42 PM
Mark4's Avatar
Mark4 Mark4 is offline
Member
endshake question endshake question endshake question endshake question endshake question  
Join Date: Feb 2011
Location: Kentucky
Posts: 17
Likes: 0
Liked 1 Time in 1 Post
Default endshake question

what is acceptable cylinder to forcing cone clearance on a 1905
4th 38 spec? If I did this correctly I measured .013.
wedged the cylinder forward and measured .004. difference
of .009, seems excessive. Is that too much? If so what are
the likely causes?
Reply With Quote
  #2  
Old 02-19-2011, 08:25 PM
tennexplorer's Avatar
tennexplorer tennexplorer is offline
US Veteran
endshake question endshake question endshake question endshake question endshake question  
Join Date: Mar 2001
Location: Memphis, TN, USA
Posts: 1,429
Likes: 898
Liked 981 Times in 293 Posts
Default

Yes, it's a lot. Older specifications allowed a barrel cylinder gap up to .012" if I remember correctly. With a .38 Special firing regular pressure loads, you are not going to notice much velocity loss with the wide gap. The problem with endshake is once it gets started it accelerates wear. Look at the front of you cylinder and see if you see bright rub spots and look at the breech end of the barrel and see if you see the same. If you do, those are not good. I would recommend correcting the endshake, as yours is excessive. What causes it is firing. It is to be expected especially ina revolver as old as yours.
__________________
S&WCA 1729
Reply With Quote
  #3  
Old 02-19-2011, 09:58 PM
Mark4's Avatar
Mark4 Mark4 is offline
Member
endshake question endshake question endshake question endshake question endshake question  
Join Date: Feb 2011
Location: Kentucky
Posts: 17
Likes: 0
Liked 1 Time in 1 Post
Default

Thanks tennexplorer, I don't see any rub marks yet. Given the measurements from above would I start with endshake bushings? Is the objective to close the .013 gap or reduce the .009 difference? will the bushings do both?
Reply With Quote
  #4  
Old 02-19-2011, 10:26 PM
Dragon88 Dragon88 is offline
Member
endshake question endshake question endshake question endshake question endshake question  
Join Date: Dec 2009
Location: North Carolina
Posts: 3,055
Likes: 107
Liked 448 Times in 202 Posts
Default

The bushings will do both. They will remove the endshake, but unfortunately in doing so they will shift the cylinder rearward and increase your constant cylinder gap. I've installed endshake bushings on three of my Smiths now with great results. If it were my gun, I would install .006" worth of bushings and test it out. Your endshake will be reduced to a more acceptable level, and your cylinder gap will be large but still workable.

Installing bushings is easy if you follow the steps correctly. Please ask if you need any help with that.

I have heard that there is another way to fix endshake, where the yoke is (stretched?) slightly. It seems this would remove endshake without increasing cylinder gap, but you would have to ask someone more knowledgeable than I on that one.
Reply With Quote
  #5  
Old 02-19-2011, 10:31 PM
OKFC05 OKFC05 is offline
Member
endshake question endshake question  
Join Date: Aug 2007
Location: Oklahoma
Posts: 7,787
Likes: 2,575
Liked 4,371 Times in 1,892 Posts
Default

You need to take the end shake down to about .001, and live with the cyl gap unless you ae willing to spend more $$$. Reducing the cyl gap involves setting the barrel back a thread and recutting the back of the barrel--not worth it on an obviously much used old gun, IMHO.
__________________
Science plus Art
Reply With Quote
  #6  
Old 03-02-2011, 01:42 AM
ScottJ's Avatar
ScottJ ScottJ is offline
Member
endshake question endshake question endshake question endshake question endshake question  
Join Date: Feb 2010
Location: Vandiver, Alabama
Posts: 628
Likes: 3
Liked 18 Times in 9 Posts
Default

Helpful thread. Search is your friend.

I just picked up a 28-2 that was showing drag from crud on the face of the cylinder after just 24 rounds.

Measured tonight. The forward measurement was hard without a 3rd hand but an .003 feeler was tight. I essentially had to force it in.

All the way back an .011 would barely go but a .012 wouldn't.

Almost the same difference as the OP. Guess I'll go with an .006 bushing too.
Reply With Quote
  #7  
Old 03-02-2011, 01:01 PM
haggis haggis is offline
Absent Comrade
endshake question endshake question endshake question endshake question endshake question  
Join Date: Oct 2003
Location: Aiken, SC
Posts: 1,191
Likes: 16
Liked 197 Times in 84 Posts
Default

0.006" of shims is the best you can do right now. That will give 0.002" of endshake with a 0.011" B/C gap. You may find that after a few months, the endshake has grown to 0.003" as the shims settle in. At that point, you can add another 0.002" shim to get the the factory recommended endshake, if you wish. If you're not going to shoot the gun much, I wouldn't worry about 0.003" endshake.

Buck
Reply With Quote
Reply

Tags
endshake

Thread Tools
Display Modes

Posting Rules
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
How much endshake? Jim NNN S&W-Smithing 5 12-04-2014 10:40 PM
Yes, another CG/endshake question RIDE-RED 350r S&W Revolvers: 1980 to the Present 22 11-23-2014 09:44 AM
19-4 Endshake pittspilot S&W-Smithing 4 12-09-2011 07:07 AM
Endshake on 29-2 deuterij S&W-Smithing 15 08-30-2010 12:18 AM
I believe I had a endshake on my 686 can someone help? uad7116 S&W Revolvers: 1980 to the Present 2 01-12-2010 01:43 PM

Powered by vBadvanced CMPS v3.2.3
smith-wessonforum.com tested by Norton Internet Security smith-wessonforum.com tested by McAfee Internet Security

All times are GMT -4. The time now is 11:49 AM.


Search Engine Optimisation provided by DragonByte SEO v2.0.42 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Smith-WessonForum.com is not affiliated with Smith & Wesson Holding Corporation (NASDAQ Global Select: SWHC)