Farm Equipment - 262 Block

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262 Block - External Crack

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=200390
Printed Date: 09 May 2024 at 4:48am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 262 Block - External Crack

Posted By: wjohn
Subject: 262 Block - External Crack
Date Posted: 18 Mar 2024 at 11:19pm

I have two G262 blocks that appear to be cracked just to the rear of the carburetor, underneath the manifold. Is a vertical crack in this spot caused by freezing, or something else?

If I recall correctly the WC/WD/etc. blocks always cracked horizontally behind the carb. I was wondering if the cracks I'm seeing in the 262s are typical of freezing.

One has been repaired with a bolted on plate over the top of it, and the other appears to have been running for some time and has just slightly been seeping.

EDIT: Meant rear of carb, not front... Towards the flywheel side. Dave, will look to see if it's between which cylinders later.

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1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45

Replies:

Posted By: DiyDave
Date Posted: 19 Mar 2024 at 4:28am

Water freezing and cast iron can be pretty odd sometimes. I haven't seen many 262 cracks, mostly like you, the 4 cyls tend to be horizontal... Is/are the cracks centered on a specific cyl? Sometimes a vertical crack can be indicative that a rod snapped, rapped the side of the block, causing a crack. Inspection from the inside would reveal if this is the cause...

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