Farm Equipment - Oil cooled piston 190 XT

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Oil cooled piston 190 XT

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=209554
Printed Date: 31 Dec 2025 at 10:39pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Oil cooled piston 190 XT

Posted By: Leon B MO
Subject: Oil cooled piston 190 XT
Date Posted: 31 Dec 2025 at 3:15pm

In the process of rebuilding a very tired Series 3 XT. We've had the tractor for 15 years and little by little it got harder to start. Very low compression. We have no prior history. The main bearings have 74 stamped in them and rod #1 has the serrated cap, so someone has been in there at some point. Going to check out the head and have the pump and injectors redone. Pump guy said it was wore out.

So got the kit and the main bearings have the oval hole for the piston cooling and the block has the port as well, but the bearings we removed had just a hole and would not have fed oil to the cooling ports. Just to be sure, it's ok to use this style bearing without a loss of oil pressure issue.

Thanks

Leon B MO

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Uncle always said "Fill the back of the shovel and the front will take care of itself".

Replies:

Posted By: DrAllis
Date Posted: 31 Dec 2025 at 3:33pm

An XT block doesn't have the small hole (.040") drilled in the upper main brg saddle for piston cooling. So, even tho the upper bearing shell has the delivery slot, the oil has no place to go. Will work fine.