Farm Equipment -Knowledge Base - "226" engine differences

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"226" engine differences

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment -Knowledge Base
Forum Description: Long term storage of technical article, etc
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=204232
Printed Date: 30 Oct 2025 at 8:35pm
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Topic: "226" engine differences

Posted By: DrAllis
Subject: "226" engine differences
Date Posted: 19 Nov 2024 at 5:32pm

The famous West Allis built A-C "226" gasoline and LP gas engines have quite a history starting in 1953 with the introduction of the W-226 series used in the WD-45 tractor and also in many other applications. The W-226 was the next generation engine evolving from the W-201 engine first used in the WC/WF and WD tractors and other applications. The W-201 was a square engine with a 4 inch bore and 4 inch stroke for 201 cubic inches. The new W-226 retained the 4 inch bore and was given a 4 1/2" stroke. Compression was also raised to 6.5 to 1. The W-226 was the first A-C engine to be equipped with "Power Crater" pistons, which instead of a typical flat top piston design, the Power Crater was designed like a cereal bowl, which positioned the air/fuel mixture more to the center of the combustion chamber where the spark plug was. The W-226 gas engine was 43 PTO HP at 1400 rated RPM in the WD-45. In late 1957, the new "G-226" gas/LP gas engine was first released in the D-17 tractor. The new G-226 had the same bore and stroke as the W-226, but the block was different and stronger, main bearings were 3 inches in diameter (instead of 2 1/2 inches), compression was raised to 7.25 to 1 (gas) and rated speed was increased to 1650 RPM's. These changes gave the D-17 53 PTO HP with the tractor being equipped with power steering, which probably took 1 or 2 HP to operate. While they share many parts, they ARE NOT and never were the "same" engine as some people think. The G-226 continued on in the 170 and 175 tractors until 1974, with flywheel HP reaching the 70+ HP mark from the original 63 flywheel HP of the D-17 engine. Once again, a W-226 and G-226 are different engines.

Replies:

Posted By: allischalmerguy
Date Posted: 30 Nov 2024 at 7:48pm

Thanks for the history lesson Tom! Very interesting. I hope you and your family are well and had a good thanksgiving. God bless you.
Pastor Mike Townsley

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It is great being a disciple of Jesus! 1950 WD, 1957 D17...retired in Iowa,

Posted By: Dragfluid
Date Posted: 30 Nov 2024 at 8:03pm

So Doc, is the bell housing bolt pattern the same throughout? And the crank flange depth? A 175 engine would bolt up fine in a Series 3 D-17?

Thank you!

Posted By: DrAllis
Date Posted: 01 Dec 2024 at 6:28am

The back of the block has the same bolt pattern from a 1934 WC tractor up to a 1974 175 gas tractor. Crankshaft tail protrusion and flywheel bolts all the same too.

Posted By: Dragfluid
Date Posted: 01 Dec 2024 at 9:24am

Thank you, Sir. That will make life much easier! :)

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Series III D-17
Many others in my life.

Posted By: DonBC
Date Posted: 10 Dec 2024 at 2:32pm

That 226 engine found many uses such as a power unit for pumps, generators, saw mills and else that needed a power unit.

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Jack of all trades, master of none