Farm Equipment - 670T engine question

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670T engine question

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=209250
Printed Date: 06 Dec 2025 at 10:42pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 670T engine question

Posted By: 8070nc
Subject: 670T engine question
Date Posted: 06 Dec 2025 at 6:22pm

Did all 670Ts with bosch injectors have the large wrist pins

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1984 80780
1957 D14
DES 300 with 25000 engine
616 tractor

Replies:

Posted By: DrAllis
Date Posted: 06 Dec 2025 at 6:45pm

1982 was M-100 and Bosch nozzles and big pins in the 8000 series and N-series combines for sure. I think the big pin/3-ring piston thing was the fall of 1980 production?? Still a Roosa pump but Bosch injectors. It would have been at a certain eng s/n break. That's kind of how I remember it.

Posted By: 8070nc
Date Posted: 06 Dec 2025 at 8:06pm

Thanks Doc. The reason i ask is I have a 8070 that has the most blowby ive ever seen. Ive found a 670t thats affordable. I know it doesnt have the counterbalanced crank but no harder than ill use the tractor i think itll be fine. Just have to keep the rpm down to 670t level. It has bosch injectors but no injectoin pump is gone and they cut the injection lines. The stubs appear to have been to a m100 pump

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1984 80780
1957 D14
DES 300 with 25000 engine
616 tractor