Farm Equipment - WD45 Flat Top Pistons

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WD45 Flat Top Pistons

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=166419
Printed Date: 17 Dec 2025 at 3:04am
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Topic: WD45 Flat Top Pistons

Posted By: Farrell(Utah)
Subject: WD45 Flat Top Pistons
Date Posted: 07 Dec 2019 at 10:38am

. Several weeks ago I made a post about finding overbore flat top pistons in one of my WD45 tractors. Yesterday, I pulled a piston out and found that it is not an AC piston. The markings are WMW A 1070. As I understand, this stands for White Machine Works. Does anyone know anything about these pistons such as compression, HP, etc.? Are rings still available? Thanks.

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A(1937), 2 G, 2 WD45 diesels, 6 WD45 gas, UC, 2 WD, D17 gas, WF, Farmall 400, D12, Kubota B3030

Replies:

Posted By: AaronSEIA
Date Posted: 07 Dec 2019 at 11:29am

Google search shows that WMW eventually became Clevite. Not sure if or how that helps.

AaronSEIA

Posted By: Alvin M
Date Posted: 07 Dec 2019 at 1:57pm

Hastings Calls It A White Machine Piston # A1070 Use Ring Set # 2C7553 4 1/8 Bore

Posted By: Farrell(Utah)
Date Posted: 07 Dec 2019 at 2:16pm

Thanks very much you guys. Looks like it can be reprinted.

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A(1937), 2 G, 2 WD45 diesels, 6 WD45 gas, UC, 2 WD, D17 gas, WF, Farmall 400, D12, Kubota B3030

Posted By: DaveKamp
Date Posted: 07 Dec 2019 at 5:05pm

Aside from the shape of the piston top, you should measure the piston height... meaning, distance from the top of the piston edge to the center of the wrist pin. When comparing pistons, the dome, flat, or dish is only PART of the piston's end displacement- the piston height shows the rest.

It is very possible that an aftermarket flattop could exhibit same, or less compression than a factory dished piston.

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Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest.