301 rod bolts?
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=200407
Printed Date: 13 Nov 2024 at 2:49pm
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Topic: 301 rod bolts?
Posted By: im4racin
Subject: 301 rod bolts?
Date Posted: 19 Mar 2024 at 6:49pm
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In process of putting pistons in a 190xt. Want to replace rod bolts while in there. Agco parts book shows 2 numbers. One sounds like rod replacement is required and the other is a direct replacement based on esn. 2d-12051. How I know if it has new rods? Bearings have a 89 date stamp so I know it’s been open. Please help!
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Replies:
Posted By: Carl(NWWI)
Date Posted: 19 Mar 2024 at 10:55pm
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From what I understand the later caps for the 12point bolts had a slightly chamfered hole where the bolt head is. I’ve put a couple together with an updated bolts that I’m pretty sure didn’t have the chamfered rod caps, because they were still the hex head bolts. Both still running strong. I don’t know why the chamfer would even matter because the 12pt bolts heads have a flat mating surface.
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Posted By: im4racin
Date Posted: 20 Mar 2024 at 7:46pm
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I have rod number 4020888. Is that a new rod or the old?
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Posted By: tbran
Date Posted: 22 Mar 2024 at 11:52pm
6 point rod bolts were the old ones - 12 point were the later - I doubt anyone updated the bolts as AC said that was a no-no w/o machining the rod cap - we never had an issue with the 301 bolts - it was the 426 that we changed.
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