Farm Equipment - 175 diesel HELP !

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175 diesel HELP !

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=43160
Printed Date: 03 Sep 2025 at 4:48am
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Topic: 175 diesel HELP !

Posted By: smokey
Subject: 175 diesel HELP !
Date Posted: 02 Jan 2012 at 5:50pm

This tractor is a 1974 w/ 4cyl perkins diesel that Dad bought new, it has a CAV pump on it and it is leaking fuel at the cover gasket, dad bought a new gasket for it so I'am working trying to correct the problem, I have checked and cleaned all the edge's and put it all back together and that darn thing is still leaking around the cover mailto:S**$@*%% - S**$^@*%% now what any help would be great, is there anything a guy can use to correct this ?

Thanks.

Replies:

Posted By: geb
Date Posted: 02 Jan 2012 at 6:18pm

You probably have a hair line crack in the cover. They are bad for that.

Posted By: injpumpEd
Date Posted: 02 Jan 2012 at 7:31pm

I've only ever seen one cracked, but there can be some warpage in the top cover due to overtorquing in the past. the torque on the acorn nuts is only 45" lb. they can be a challenge to get sealed up.

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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!

Posted By: ac-mike
Date Posted: 03 Jan 2012 at 8:05am

Those pumps are prone to leaking by the o-rings on the control rods that are in the head. The o-rings tend to harden and leak with age. Thet are easy to replace, I have done several.

Posted By: Eldon (WA)
Date Posted: 03 Jan 2012 at 10:45am

I have one that had been leaking at the shut-off shaft off and on for quite a few years. I found that if I don't push the knob all the way in (leave it 1/4" out) it wouldn't leak. Has been over a year now and still no leak. It has become a habit on all of my 170/175's now.

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