Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo Auction Link (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Tractor Talk Discussion Forum

Bent Crank????

Welcome Guest, Log in or Register
Author 
CH

12-06-2003 20:06:17




Report to Moderator

Just got the pistons out of a stuck 125CI Allis B engine. When I turn the the crank there is an uneven amount of resistance at 180 degrees rotation. Does this sound like a bent crank?

Thanks for the help.




[Log in to Reply]   [No Email]
sod

12-07-2003 18:28:35




Report to Moderator
 Re: Bent Crank???? in reply to CH, 12-06-2003 20:06:17  
As long as you have it tore down this far, rebuild the whole thing to specs. You will be happy.
regrind the crank, etc.
good luck
sod



[Log in to Reply]  [No Email]
ErnieD

12-07-2003 08:59:58




Report to Moderator
 Re: Bent Crank???? in reply to CH, 12-06-2003 20:06:17  
Loosen one journal at a time until you find the egged one, bet it is too tight.



[Log in to Reply]  [No Email]
cole in mo.

12-06-2003 23:45:09




Report to Moderator
 Re: Bent Crank???? in reply to CH, 12-06-2003 20:06:17  
it could be a bent crank, but I would pull the timing cover and check for rust on the cam gear or in the govener.



[Log in to Reply]  [No Email]
Ch

12-07-2003 05:34:58




Report to Moderator
 Re: Re: Bent Crank???? in reply to cole in mo., 12-06-2003 23:45:09  
I've got the govener out. Had to looser the bearing clamps on the crank to get it to move at all. I tightened the center one and that didn't tighten the rotation, but if I torq either end clamp I still get a different resistance in rotation. I can hardly turn it for maybe 30 or 40 degrees. I oiled the bearings, being carful of the shims, but it didn't make a real difference. Seems to me it should spin easy with no pistons in it. By the way, this is my first rebuild.

[Log in to Reply]  [No Email]
wdTom

12-07-2003 13:52:07




Report to Moderator
 Re: Re: Re: Bent Crank???? in reply to Ch, 12-07-2003 05:34:58  
Shimming bearings is not a fast easy thing. It will take time and fitting of parts to come out right. You need to have the proper amount of "crush" That is, with the bearing shells in place, shims in place but bolts not more than finger tight, you need to be able to insert the proper feeler gauge into the gap between the bearing cap and block or rod. If with the proper cursh you still have too much bearing clearance (plasti gauge it to see) well now you neeed to carefully and evenly file the bearing shell and reduce the shim thickness by the same amount to maintain the proper crush. It takes time. Look in your manual for the proper cursh. Have you done this? With the proper clearance bearings can seem to grab or have seized up if you don't turn the crank for a while, but when you break it free it should rotate freely and start again after you let it stop for only a few seconds or a couple of minutes.

[Log in to Reply]  [No Email]
CH

12-07-2003 18:47:14




Report to Moderator
 Re: Re: Re: Re: Bent Crank???? in reply to wdTom, 12-07-2003 13:52:07  
Thanks Tom. I pulled the crank, it needs turning. My manuals are on the way. Thought I'd get started. I keep finding new things. The vanes in the oil pump were stuck and the water pump was a little rough. I've got a lot of time before this little tractor has to run. I bought a package deal, '39 on rough tires but together and a '41 parts tractor, most of it is there. That's the engine I'm working on. I figure rebuild the worst first, especially since in parts it fits into my cellar shop. I figure if'n I'm gonna do this I might as well make it last another 60 years. That way I won't have to rebuild it again 'till I'm 107.

I'll be buggin you veterans for help for a while. Hope ya don't mind.

Charlie

[Log in to Reply]  [No Email]
RAB

12-07-2003 11:33:23




Report to Moderator
 Re: Re: Re: Bent Crank???? in reply to Ch, 12-07-2003 05:34:58  
You may regard this as a stupid suggestion, and it may not be possible, but are the mains caps on the right way round and in their correct positions?
Have shims been removed to take up clearance and left the crank tight due to ovality? (more likely on big ends).
Regards, RAB



[Log in to Reply]  [No Email]
CH

12-07-2003 12:05:49




Report to Moderator
 Re: Re: Re: Re: Bent Crank???? in reply to RAB, 12-07-2003 11:33:23  
I think you might be on to it. As long as I've got the engine down this far, I'm going to pull the crank and mic it out. The farther I take it down the more glad I am I did. Just took the oil pump out and the vanes were stuck. Might as well take it to the bare block and rebuild it from the bottom up.

Thanks for the help.



[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy