Farm Equipment - 7020 still knocking

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7020 still knocking

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=196298
Printed Date: 12 Nov 2025 at 11:43am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 7020 still knocking

Posted By: BillinAlberta
Subject: 7020 still knocking
Date Posted: 24 Jul 2023 at 1:45pm

Well I replaced the injectors and still have the knock.

Looks like a costly repair bill coming.Something is unhappy.

Just for the hell of it would a gas engine from a G combine

bolt in without too much work?I have one sitting in the shed

that runs fine.

The tractor is only going to be used a few hours a year for light (10

foot disc and cultivator in sandy soil) tillage ,bushcutting ,and baling.Yes

I know the fuel consumption will be awful.Yes there will be less horsepower but hopefully it would be enough.

A diesel expert will be here tomorrow to diagnose the problem.If the repair is affordable

I will get the engine fixed , that is my first choice.

Replies:

Posted By: Lars(wi)
Date Posted: 24 Jul 2023 at 2:01pm

In my humble opinion, if the engine is toast, you’d be better off getting a different tractor, if you choose not to fix the engine you have.

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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.

Posted By: 8070nc
Date Posted: 24 Jul 2023 at 2:46pm

Before I started tearing into it id check the torsional damper on the front of the crank. Ive got a 8070 thatvI would have sworn had a rod knock
Pulled the pan checked the bearings looked brand new. After a lot of questions on the forum we decided it must be the damper
That was it

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1984 80780
1957 D14
DES 300 with 25000 engine
616 tractor

Posted By: injpumpEd
Date Posted: 24 Jul 2023 at 2:54pm

A gas 7020 would be interesting to see lol!

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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!