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


Torquing rod bolts how do I line up the cotter pin
 Post Reply Post Reply
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
TX fanatic View Drop Down
Silver Level
Silver Level


Joined: 09 Jul 2012
Location: Central WI
Points: 52 		Post Options Post Options   Thanks (0) Thanks(0)   Quote TX fanatic Quote  Post ReplyReply Direct Link To This Post Topic: Torquing rod bolts how do I line up the cotter pin
    Posted: 05 Sep 2012 at 7:21pm
I am in process of putting my C's motor back together. I have got to he point of installing the pistons and here's my question

Out of the 8 rod nuts only one of them (torqued to spec) has lined up with the cotter pin hole! Do I over tighten it, or back off until it lines up,  or do I use shims (washers) under the nut? 

Thanks Steve


Edited by TX fanatic - 05 Sep 2012 at 7:28pm
Back to Top
Sponsored Links


Back to Top
MACK View Drop Down
Orange Level
Orange Level


Joined: 17 Nov 2009
Points: 7664 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MACK Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2012 at 10:00pm
Throw the cotter pins in the trash can.  That is old knowledge.  MACK
Back to Top
dave63 View Drop Down
Orange Level
Orange Level
Avatar

Joined: 01 Feb 2011
Location: Lineboro Md
Points: 2382 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dave63 Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2012 at 6:16am
Originally posted by MACK MACK wrote:

Throw the cotter pins in the trash can.  That is old knowledge.  MACK
It may be old knowledge BUT there are young ones on here that do not have old Knowledge!!
explain yourself? I have a C engine tore down now that has two rod cap nuts ,the rod cap in the pan and the rod went through the side of the block becouse the last person that was in there did not put cotter pin through the nuts.
To answer the question the service manual calls for 35 ft on the rod nuts the last one i did i had to put 40 on them to lie up the pin holes and it turns over nice. It is not finished so i don't know if there will be a problem or not but.
BTW the service manual says make shure the cotter pins are snug becouse they will wear out if they can move.
The universal answer to all questions is yes, how much do you want to spend?
Back to Top
DonDittmar View Drop Down
Orange Level
Orange Level
Avatar

Joined: 15 Sep 2009
Location: MIllersburg, MI
Points: 2516 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DonDittmar Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2012 at 6:23am
I always torque to spec, then tighten till the hole lines up, if needed.
Experience is a fancy name for past mistakes. "Great moments are born from great opportunity"

1968 D15D,1962 D19D
Also 1965 Cub Loboy and 1958 JD 720 Diesel Pony Start
Back to Top
Lonn View Drop Down
Orange Level
Orange Level
Avatar

Joined: 16 Sep 2009
Location: Назарово,Russia
Points: 29817 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lonn Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2012 at 6:26am
Replace nuts with new type nuts that are the locking type used in newer engines. Some call them aircraft nuts. Kinda cone shaped.
-- --- .... .- -- -- .- -.. / .-- .- ... / .- / -- ..- .-. -.. . .-. .. -. --. / -.-. .... .. .-.. -.. / .-. .- .--. .. ... -
Wink
I am a Russian Bot
Back to Top
Lonn View Drop Down
Orange Level
Orange Level
Avatar

Joined: 16 Sep 2009
Location: Назарово,Russia
Points: 29817 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lonn Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2012 at 6:30am
This is what they look like.
-- --- .... .- -- -- .- -.. / .-- .- ... / .- / -- ..- .-. -.. . .-. .. -. --. / -.-. .... .. .-.. -.. / .-. .- .--. .. ... -
Wink
I am a Russian Bot
Back to Top
Amos View Drop Down
Orange Level
Orange Level


Joined: 11 Sep 2009
Location: Ontario
Points: 1318 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Amos Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2012 at 7:17am
Clean nut and rod bolt as clean as you can get them and use red loctite.
Don't trust lock nuts, they can work loose.


Edited by Amos - 06 Sep 2012 at 7:17am
Back to Top
Gatz in NE View Drop Down
Orange Level
Orange Level


Joined: 11 Sep 2009
Location: Lincoln, NE
Points: 1063 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Gatz in NE Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2012 at 7:57am
Originally posted by Lonn Lonn wrote:

This is what they look like.

OK, so you go to APEX site and.......  what the heck to you type in for a 3/8-24 locknut in their search box ?
Back to Top
MACK View Drop Down
Orange Level
Orange Level


Joined: 17 Nov 2009
Points: 7664 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MACK Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2012 at 8:02am
If they are properly torqued they will stay tight. How many nuts have you ever saw loosen against cotter pin? In my 50+ years of mechanic work I have never saw one. MACK
Back to Top
7060 View Drop Down
Orange Level
Orange Level
Avatar

Joined: 16 Sep 2009
Location: Missouri
Points: 1148 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 7060 Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2012 at 8:27am
I agree. I don't think they would come loose, but for insurance you could put a drop of red locktite on them. That engine only turns about 1500, unlike a puller or something.
Back to Top
WC7610 View Drop Down
Orange Level
Orange Level


Joined: 11 Sep 2009
Location: Sioux City, IA
Points: 764 		Post Options Post Options   Thanks (0) Thanks(0)   Quote WC7610 Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2012 at 9:24pm
I've never seen one loose against the pin either, but it would be my luck the one I didn't put a pin in would come loose.  Seems like a rather simple task to complete compared to the whole engine overhaul.  Good luck!
Thanks



Most Bad Government has grown out of Too Much Government- Thomas Jefferson
Back to Top
TX fanatic View Drop Down
Silver Level
Silver Level


Joined: 09 Jul 2012
Location: Central WI
Points: 52 		Post Options Post Options   Thanks (0) Thanks(0)   Quote TX fanatic Quote  Post ReplyReply Direct Link To This Post Posted: 07 Sep 2012 at 10:45am
Thanks for all of the suggestions.

I haven't decided for sure what I'm going to do. 

I did give it some thought tho.   The factory must have tightened or loosened them to fit the cotter pins because they most certainly did not line up every time. This is probably the route I'll go.
Back to Top
mdtractormechanic View Drop Down
Orange Level
Orange Level
Avatar

Joined: 26 May 2011
Location: MD
Points: 662 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mdtractormechanic Quote  Post ReplyReply Direct Link To This Post Posted: 07 Sep 2012 at 10:48am
As Don said, Torque to specs then tighten the castle nut to the first opening. This is the only method when using castle nuts for torque specific applications. And as Dave said, once you re-install a new pin back the nut off against the cotter pin to keep it from wearing from vibration.

As for 'old knowledge' (by this I'm guessing it means old technology), does that imply that there is something better? What about the wheel? If something works and works well what's the point in modifying it.


Edited by mdtractormechanic - 07 Sep 2012 at 1:15pm
Joe's 1939 Model WC, 1940 Model RC, 1944 & 1950 Model C's, B-125 PU
Back to Top
Dick L View Drop Down
Orange Level
Orange Level
Avatar

Joined: 12 Sep 2009
Location: Edon Ohio
Points: 5093 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dick L Quote  Post ReplyReply Direct Link To This Post Posted: 07 Sep 2012 at 6:39pm
Not old  knowledge but but standard practice on old tractors and old cars rod bolts with cotter keys before tag was a pup.  Bring the torque up to spec and tighten just enough more to insert the cotter key. On this engine you would bring it up to 35 pounds torque and put the cotter key in at slightly over 35 pounds.  That will put it between 35 and 40 pounds of torque.


Edited by Dick L - 07 Sep 2012 at 6:40pm
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 0.135 seconds.


Help Support the
Unofficial Allis Forum