Farm Equipment - wd piston

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wd piston

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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=45091
Printed Date: 23 Aug 2025 at 10:24am
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Topic: wd piston

Posted By: mattb
Subject: wd piston
Date Posted: 06 Feb 2012 at 11:41am

Hello im looking for a MnW add power piston for a wd or wc made for the 4 inch stroke. I think they are part number SP46. Any one have one?

Replies:

Posted By: Brian G. NY
Date Posted: 07 Feb 2012 at 12:02pm

I have an M&W "Add-Power" piston which came out of a WD.

However, the number is AP-46, not SP-46.

It is a crater style piston, 1/8" oversize.

Maybe the SP stands for standard size?

Posted By: mattb
Date Posted: 07 Feb 2012 at 3:03pm

I was just going from memory. Your probaly right. Its 4.125 how much do u want for it? My number is 618 314 2163 thanks.

Posted By: mattb
Date Posted: 07 Feb 2012 at 3:05pm

And could u please post a good picture of it on here?

Posted By: Brian G. NY
Date Posted: 07 Feb 2012 at 3:55pm

I bought a WD for parts about 10 yrs ago. The P.O. had had the engine rebuilt but he left it out and the engine seized. He hired a neighbor kid to get it unsieized for him.

First thing the kid did was pull the head. He found this particulat cylinder slightly rusted up so he pulls the piston. Then, he never got back to finish the job and the P.O. didn't have brains enuf to put some oil in the remaining cylinders, pu the head back on and cover it well. So, when I picked up the tractor, this piston was in his garage just the way it came out. I notice that all but the top ring are seized but I don't think that is a big problem. As you can see (and as the P.O. told me) this piston has almost no wear.

PM me if you are interested and we'll talk price.

Posted By: Brian G. NY
Date Posted: 07 Feb 2012 at 3:58pm

I've posted many pics on here before and they never showed up with that damnable red X before. I can never open pics with the red X (I guess I don't have the right program or something) so I hope you are able to open them.

Posted By: SteveC(NS)
Date Posted: 08 Feb 2012 at 8:11am

I couldn't