Farm Equipment - 8070 426 Engine Rebuilt Questions

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8070 426 Engine Rebuilt Questions

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=51558
Printed Date: 11 Sep 2025 at 5:42pm
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Topic: 8070 426 Engine Rebuilt Questions

Posted By: Sonlight
Subject: 8070 426 Engine Rebuilt Questions
Date Posted: 04 Jun 2012 at 9:52am

We have our 8070 up and running again after a complete engine rebuild. It runs very smooth and sound s good, but i have a few questions.

1. Is it normal for a rebuilt engine to use a lot of oil and smoke a lot even after initial break in? (We've ran it for about 10 hours. Went from full to add in 6 hours on the harvester)

2. We had it on the dyno at local dealership and it put out 220 Hp. Is that a concern for other components on the tractor? Should pump be sent to be adjusted? (I don't know what Hp it had before rebuild) Thanks

Replies:

Posted By: Orange Blood
Date Posted: 04 Jun 2012 at 10:03am

I don't really think it is going to be "broke in" in just ten hours, and yes they do use some oil during break in, are you absolutely sure you put the rings in correctly? Did you have a valve job done, that included checking the valve guides? That HP is perfectly normal for that tractor. I do think you need a few more hours on her to be fully broken in, but the smoke does concern me some.

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Still in use:
HD7 WC C CA WD 2-WD45 WD45LP WD45D D14 3-D17 D17LP 2-D19D D19LP 190XTD 190XTLP 720 D21 220 7020 7030 7040 7045 3-7060
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Posted By: Hurst
Date Posted: 04 Jun 2012 at 6:36pm

Turbo seals?

Hurst

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1979 Allis Chalmers 7000
5800 Hours

Posted By: DrAllis
Date Posted: 04 Jun 2012 at 7:23pm

MAKE SURE YOUR INJECTORS ARE INSTALLED CORRECTLY !! (not 180 degrees off) correctly means the return line is towards the valve cover. That engine at 220 PTO HP is going to smoke somewhat.....did you install new injector tips??????????????? turning pump down to 170 HP where it belongs is very easy to do when it was on the dyno.

Posted By: MACK
Date Posted: 04 Jun 2012 at 9:55pm

I have saw alot of rebuild engins use for 200 hrs before they quit. MACK

Posted By: 427435
Date Posted: 04 Jun 2012 at 10:45pm

I hope the injection pump wasn't also changed to raise the rated rpm.

I don't know about today's dynos, but when they first started showing up at dealers, they all read high. If they didn't, a dealer soon stopped using them as they would lead to unhappy customers.

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Mark

B10 Allis, 917 Allis, 7116 Simplicity, 7790 Simplicity Diesel,
GTH-L Simplicity

Ignorance is curable-----stupidity is not.

Posted By: Sonlight
Date Posted: 03 Jul 2012 at 1:00pm

"MAKE SURE YOUR INJECTORS ARE INSTALLED CORRECTLY !! (not 180 degrees off) correctly means the return line is towards the valve cover. That engine at 220 PTO HP is going to smoke somewhat.....did you install new injector tips??????????????? turning pump down to 170 HP where it belongs is very easy to do when it was on the dyno."

TThankyou Dr.Aliis! We did have the injectors installed wrong(180 degrees) for the first 10 hours. How harmful is that to an engine? Also dealership said they'd have to send pump (American Bosh) away to adjust HP?? The tractor still smokes white bluish smoke but i think it is burning a little less oil the more we use it . Thanks for the replies!

Posted By: TREVMAN
Date Posted: 03 Jul 2012 at 1:20pm

They will smoke for a while after rebuild. Take Dr. Allis' advice, get it turned down to rated pto power, I suspect most of the smoke will disappear, Trev.

Posted By: Sonlight
Date Posted: 03 Jul 2012 at 1:56pm

Posted By: Calvin Schmidt
Date Posted: 03 Jul 2012 at 8:44pm

Good luck and hopefully the oil consumption will stop soon. I went through a nightmare with a D-21 engine rebuild where the rings did not seat. Some of your horsepower is comming from burning the oil as fuel. PM me if the oil comsumption doesn't soon stop.

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Nothing is impossible if it is properly financed

Posted By: DrAllis
Date Posted: 03 Jul 2012 at 10:32pm

Two things: #1.This local dealer is a very poor Service dealer if he doesn't know how to turn the HP down on your 8070. #2. If he doesn't know how to turn down your pump, I'll bet he doesn't know how to run a dyno either....if it's an M&W dyno, they usually read high anyway.