De-code a Z code engine
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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=130392
Printed Date: 06 Aug 2025 at 5:01am
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Topic: De-code a Z code engine
Posted By: Larry(OH)
Subject: De-code a Z code engine
Date Posted: 24 Oct 2016 at 12:29pm
Other than being a Z code, what year? Also, what is the 17 in front of the serial number for? Was this on all of them?
17-57252-Z is on the block
Thanks
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'40 WC puller,'50 WD puller,'50 M puller '65 770 Ollie
*ALLIS EXPRESS contact*
I can explain it to you, BUT I cannot understand it for you!!
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Replies:
Posted By: Chad(WI)
Date Posted: 24 Oct 2016 at 12:40pm
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D-17 or G-226 power unit engine. Z is high compression for lp gas. Not sure on the year.
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Posted By: DrAllis
Date Posted: 24 Oct 2016 at 1:17pm
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Pretty sure the "17" means D-17 era so before July 1967. I think the One-Seventy engines were 7-XXXXXXX-Z which would have been July 1967 and newer.
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Posted By: Chad(WI)
Date Posted: 24 Oct 2016 at 1:58pm
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I think I messed up. I was going from memory. The V suffix is for an LP engine.
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Posted By: DrAllis
Date Posted: 24 Oct 2016 at 2:28pm
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Anyway, the "Z" code is 8.0 to 1 compression, same as a One-Seventy tractor.
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Posted By: Ted J
Date Posted: 24 Oct 2016 at 7:59pm
I believe that the Z engine was from a Gleaner..... I have one in my EARLY D-17: Tractor Serial Number: D17-5855 Engine Serial Number: 17-87205-Z
I got this from somebody on here..............
Gleaner E motor was based on D17 (G226), not WD45 (W226). Same 226 ci displacement, but higher compression (7.2 nominal vs 6.5 at Sea level and 8.0 high altitude) and rated at higher RPM (1650 vs 1400 - NOTE: the 170/175 gas were same but even higher 1800 RPM - they tried to go to 2000 in the 180, but Swinford's AC Farm Equipment 1914-1985 says they had vibration problems at 2000 rpm). D17 Gas (7.2:1) was rated at 52.7 belt and 48.64 drawbar HP - Gleaner E should be similar though some of the later G226 got over 60 Brake HP as I recall.
W226 got 60 brake HP (this was in WD45 trim) and G226 (at 1800 RPM in D17 or 170 trim?) got 11% more at 67 brake HP, again according to Swinford's book p195, see also p201. Note Brake HP is not same as tractors quoted in Belt or Drawbar HP.
The Gleaner E was a self-propelled combine harvester manufactured by the Gleaner Manufacturing Company while part of the Allis-Chalmers Manufacturing Company in the 1960s. 17,300 machines were manufactured in total from 1962 to 1969.
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"Allis-Express"
19?? WC / 1941 C / 1952 CA / 1956 WD45 / 1957 WD45 / 1958 D-17
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Posted By: DrAllis
Date Posted: 24 Oct 2016 at 8:38pm
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D-17 (G-226) was rated at 63 flywheel HP (52.72 PTO) at 1650 RPM and had 7.25 to 1 compression ratio(M code?). Late model E and E3 Gleaner was rated at 67 flywheel HP @ 1650 RPM and had 8.0 to 1 compression (Z code). The model One-Seventy was also 8.0 to 1 compression and was less HP than the D-17 at 1650 RPM, coming in at 51.46 PTO HP (hydraulic pumps take HP to run !!), so they raised the rated speed to 1800 RPM and then had 54.12 HP PTO. I would call the One-Seventy flywheel HP to be right at 70 to 71 HP. The model 175 G-226 had a different camshaft, carburetor and 8.25 to 1 compression ratio ( V code)and was 6 more HP over a One-Seventy at 1800 RPM, so that would make flywheel HP nearly 75 HP.
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Posted By: DrAllis
Date Posted: 24 Oct 2016 at 8:59pm
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So, imagine those first fifty One-Eighty gas tractors with the 175 engine running 2,200-2,250 RPM high idle and rated speed being 2000 RPM producing 64 PTO HP. That was their plan.
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Posted By: Larry(OH)
Date Posted: 25 Oct 2016 at 5:27am
Thanks for the info. This came off an "E" as its still in the cradle and the neighbor owned it. A couple of us were talking about them and noticed the 17 prefix and got curious and I wondered about how old it may be!
Thanks for the info
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'40 WC puller,'50 WD puller,'50 M puller '65 770 Ollie
*ALLIS EXPRESS contact*
I can explain it to you, BUT I cannot understand it for you!!
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Posted By: CrestonM
Date Posted: 09 Sep 2022 at 10:39am
Are there any serial lists for the Z codes, to narrow down production to a year?
Also, if I were to rebuild one, which overhaul kit do I need? A kit for a 170?
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Posted By: DrAllis
Date Posted: 09 Sep 2022 at 7:51pm
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All D-17 gas engines have a serial number like this: 17-XXXXX-M........if it is an LPgas it should have a "V" instead of an "M" for the compression ratio difference. The newest it can be is mid-1967. All One-Seventy gas engines ( mid-1967 thru 1973) have a serial number like this: 7-XXXXX-Z. There were zero LPgas tractors made, so the "Z" compression code ( 8.0 to 1) is the only one there is/was. All 175 gas engines would also be: 7- XXXXX- V for 8.25 to 1 compression ratio. They were made from late 1973 til March 1976. You can overhaul any of these and install whatever compression ratio pistons/sleeves (motor kit) you want. More compression yields more HP.
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