Farm Equipment - Rod bearings.

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Rod bearings.

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=10412
Printed Date: 22 Jan 2025 at 4:21pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Rod bearings.

Posted By: joegrgraham
Subject: Rod bearings.
Date Posted: 01 Apr 2010 at 2:48pm

Why is it that a brand new set of +20 thou rod bearings are around 6 - 7 thou THINNER than an old set of +10 thou ones I've just pulled out of the scrap bin???????????

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If it seems like a good idea, do it. It's easier to apologise than to get permission.

Replies:

Posted By: mlpankey
Date Posted: 01 Apr 2010 at 3:11pm

have you wiped the new bearings?

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people if they don't already know it you can't tell them. quote yogi berra

Posted By: Dick L
Date Posted: 01 Apr 2010 at 3:14pm

One or the other was mismarked. One of those details I gripe about all the time. Measure every part before installing.

(Brand new parts should not need to be measured) (Ya, Right) as you just found out.

Posted By: joegrgraham
Date Posted: 01 Apr 2010 at 4:04pm

Dick L, what should be the correct thickness for a new rod bearing, and the mains as well, if I've got the correct figures, I can work out the rest. Many Thanks.

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If it seems like a good idea, do it. It's easier to apologise than to get permission.

Posted By: mlpankey
Date Posted: 01 Apr 2010 at 4:16pm

I am not dick but why would you be concerned with overall thicknes of bearings . The rod with the bearing in it and the bottom cap torqued should be .002 larger than the rod journal . If thats right you put it on the rod journal and with a feeler gauge you make sure you have some side clearance between the rod and the crank jornal throw . for the oem guys the book says .004-.007 side clearance. you know you shim between the rod and rod cap unless you had them machined so that you dont use shims right.

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people if they don't already know it you can't tell them. quote yogi berra

Posted By: Dick L
Date Posted: 01 Apr 2010 at 4:35pm

Take a look at the pictures. this one of the ways I check bearings.

http://public.fotki.com/DickL/allis_chalmers_engi/filing-main-and-rod/ - http://public.fotki.com/DickL/allis_chalmers_engi/filing-main-and-rod/