This site is not affiliated with AGCO Inc., Duluth GA., Allis-Chalmers Co., Milwaukee, WI., or any surviving or related corporate entity. All trademarks remain the property of their respective owners. All information presented herein should be considered the result of an un-moderated public forum with no responsibility for its accuracy or usability assumed by the users and sponsors of this site or any corporate entity.
The Forum Parts and Services Unofficial Allis Store Tractor Shows Serial Numbers History
Forum Home Forum Home > Allis Chalmers > Farm Equipment
  New Posts New Posts
  FAQ FAQ  Forum Search   Events   Register Register  Login Login


Bearing crush and clearance
 Post Reply Post Reply
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
Luke114 View Drop Down
Bronze Level
Bronze Level


Joined: 27 Aug 2019
Location: Washington
Points: 109 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Luke114 Quote  Post ReplyReply Direct Link To This Post Topic: Bearing crush and clearance
    Posted: 11 Nov 2019 at 3:20pm
I'm a bit confused after reading through the manual on setting the crush height of the crank bearing shells.  For a crush amount of .0015", does that indicate .0015" protruding on both ends of a bearing half?

And also, should there be "crush" showing on only half of the bearing i.e. the half installed in the block has crush, but the half in the cap is flush?  If I install a bearing cap, should I see the crush gap at both sides, or only one?

What is the best way to measure the total crush?

Lastly, why does the manual say "for each .002 reduction in height of a pair of shell inserts, remove a .0025 shim from each side"?  Why isn't this a one to one relationship?

This is for a '49 C (if it matters).  Manual seems to indicate this was common across models.

Hopefully the questions make sense!  thanks 
Back to Top
Sponsored Links


Back to Top
Dick L View Drop Down
Orange Level
Orange Level
Avatar

Joined: 12 Sep 2009
Location: Edon Ohio
Points: 5087 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dick L Quote  Post ReplyReply Direct Link To This Post Posted: 11 Nov 2019 at 5:13pm
I use a feeler gage with the nuts only snug or a bit over finger tight on one side.

They are assuming you only want .0015 clearance.



Edited by Dick L - 11 Nov 2019 at 5:25pm
Back to Top
d17brown View Drop Down
Orange Level
Orange Level
Avatar

Joined: 11 Sep 2009
Location: farley iowa
Points: 1692 		Post Options Post Options   Thanks (0) Thanks(0)   Quote d17brown Quote  Post ReplyReply Direct Link To This Post Posted: 11 Nov 2019 at 6:17pm
Use plasticgauge. It crushes when bearing is torqued. Then you know your clearence
phil
Back to Top
Dick L View Drop Down
Orange Level
Orange Level
Avatar

Joined: 12 Sep 2009
Location: Edon Ohio
Points: 5087 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dick L Quote  Post ReplyReply Direct Link To This Post Posted: 12 Nov 2019 at 5:24am
Originally posted by d17brown d17brown wrote:

Use plasticgauge. It crushes when bearing is torqued. Then you know your clearence


The question comes into effect when you are removing shims to take up excessive clearance. Once the bearings have been torqued and (crushed) they do not expand. That would mean you would not get any crush when re installed. If ignored I doubt it would cause a problem.
When installing new bearings on a crankshaft that has wear and the crush is not checked the crush will be forced in against the journal and stop the crankshaft from turning. This is where filing becomes necessary.
Back to Top
Luke114 View Drop Down
Bronze Level
Bronze Level


Joined: 27 Aug 2019
Location: Washington
Points: 109 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Luke114 Quote  Post ReplyReply Direct Link To This Post Posted: 12 Nov 2019 at 11:32am
Thanks for the responses, guys.  I probably made my question overly complicated, getting crush and clearance conflated.

In this picture in the manual they show .0015" of crush on both sides, but I think a normal way of measuring would be with one bolt torqued up and the other loose, or just snug as Dick L said.  

So should I look for .0015 gap on both sides or just one?
Back to Top
Dick L View Drop Down
Orange Level
Orange Level
Avatar

Joined: 12 Sep 2009
Location: Edon Ohio
Points: 5087 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dick L Quote  Post ReplyReply Direct Link To This Post Posted: 12 Nov 2019 at 11:51am
It would be both sides to be sure you didn't have one side at .0015 and the other at .003 or something. I actually make one side flush in the rod and one end flush in the cap and measure the other end with a feeler gage using my finger to feel them flush. When torqued against the shims it will center the bearing shell.
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 11.10
Copyright ©2001-2017 Web Wiz Ltd.

This page was generated in 0.047 seconds.


Help Support the
Unofficial Allis Forum