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301 rod bolts?
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im4racin View Drop Down
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Joined: 12 Jun 2017
Location: Garrison ND
Points: 933 		Post Options Post Options   Thanks (0) Thanks(0)   Quote im4racin Quote  Post ReplyReply Direct Link To This Post Topic: 301 rod bolts?
    Posted: 19 Mar 2024 at 6:49pm
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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Carl(NWWI) View Drop Down
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Joined: 13 Sep 2009
Location: NW WI
Points: 954 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Carl(NWWI) Quote  Post ReplyReply Direct Link To This Post Posted: 19 Mar 2024 at 10:55pm
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.

Edited by Carl(NWWI) - 19 Mar 2024 at 10:56pm
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im4racin View Drop Down
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Joined: 12 Jun 2017
Location: Garrison ND
Points: 933 		Post Options Post Options   Thanks (0) Thanks(0)   Quote im4racin Quote  Post ReplyReply Direct Link To This Post Posted: 20 Mar 2024 at 7:46pm
I have rod number 4020888. Is that a new rod or the old?
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tbran View Drop Down
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Joined: 14 Sep 2009
Location: Paris Tn
Points: 3294 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tbran Quote  Post ReplyReply Direct Link To This Post 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.  
When told "it's not the money,it's the principle", remember, it's always the money..
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