Farm Equipment - 170 engine suffix ?

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170 engine suffix ?

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=57932
Printed Date: 06 Sep 2025 at 9:43am
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Topic: 170 engine suffix ?

Posted By: Tracy Martin TN
Subject: 170 engine suffix ?
Date Posted: 06 Oct 2012 at 5:10pm

What does the letter M, and Z mean at the end of engine serial number? Thanks Tracy Martin

Replies:

Posted By: Gary in da UP
Date Posted: 06 Oct 2012 at 6:41pm

M code engins are found in most D17's, 170's and Gleaner E111's have a little more compression an those are z code. D 17 lp and 175's have even more compression and are V code engines.

Posted By: Tracy Martin TN
Date Posted: 06 Oct 2012 at 8:30pm

I was wondering. I have an M code and 2 that have the Z code. Thanks Tracy Martin

Posted By: DanD
Date Posted: 06 Oct 2012 at 8:36pm

The M code is 7.2:1 compression ratio. The Z is 8.0:1 and the V is 8.2:1. Of course all that's different in the engines to change the ratios is the piston heights, so who knows what is actually inside on a 35 to 50 year old engine. I know of an M engine for example, with 8.2:1 pistons in it.