2900 block question
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=107925
Printed Date: 10 Sep 2025 at 10:43pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 2900 block question
Posted By: Josh(NE)
Subject: 2900 block question
Date Posted: 22 Jun 2015 at 10:13am
Stopped at local mechanics shop and he is doing an OH on a 190XT. He pointed out that on this 2900 block there is no oil hole for the rear cam bearing to line up with. Are they all that way or this block a fluke?
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Allis Express
'65 190XT, 37 B, '72 170, '83 8030, and the IH 560 was a mistake
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Replies:
Posted By: DrAllis
Date Posted: 22 Jun 2015 at 11:08am
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That is the way they are. Tell him to not even try to figure out how it works.
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Posted By: Josh(NE)
Date Posted: 22 Jun 2015 at 11:41am
So is it normal to have that bearing fail long before the other cam bearings. This thing had plenty of hours on it, but that bearing looked horrible.
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Allis Express
'65 190XT, 37 B, '72 170, '83 8030, and the IH 560 was a mistake
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Posted By: DrAllis
Date Posted: 22 Jun 2015 at 12:08pm
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No. The front usually looks the worst.
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Posted By: Hurst
Date Posted: 23 Jun 2015 at 10:22pm
I was once told they are oiled by magic lol! But I bet what doc said is true if you look at the old bearings. Also, put the new ones in the freezer until right before you install them. Makes it way easier to press them in.
Hurst
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1979 Allis Chalmers 7000
5800 Hours
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Posted By: tbran
Date Posted: 23 Jun 2015 at 10:56pm
once overhauled a 2900 out of a cat scan gen power unit. 12000 hours. The cam lobes were almost flat, lifters were cupped unreal, cam brgs were almost perfect - except front was showing bronze, as stated, magic,,, don't screw with perfection....
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When told "it's not the money,it's the principle", remember, it's always the money..
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Posted By: cranky
Date Posted: 24 Jun 2015 at 7:51am
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cam bearings rely on oil draining back from rockers to lube bearing journals.it is not pressure fed lube
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