Farm Equipment - more piston ID

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more piston ID

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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=23253
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Topic: more piston ID

Posted By: alan-nj
Subject: more piston ID
Date Posted: 02 Jan 2011 at 8:14am

As long as benny rasied the question, i thought i'd ask the same thing. i had the head off my 48 wd last week. this is the piston that is in it. 4 and 1/8 bore. obviously not original. made out of aluminum. can anyone identify the brand? are these m & w or some other brand? thanks alan

Replies:

Posted By: Denis in MI
Date Posted: 02 Jan 2011 at 8:16am

M&W I have a set in a WD45.

Hope that helps,

Denis

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1938 B, 1945 B, 1941 IB, 1949 C, 2 1938 WCs, 3 1950 WDs, 1951 WD, 2 1955 WD45, 1957 D-14

Posted By: alan-nj
Date Posted: 02 Jan 2011 at 8:29am

thanks. i put a set of m & w in my wc a couple of years ago, but i didn't remember exactly what they looked like and i didn't take any pictures.

Posted By: Allis Fields
Date Posted: 02 Jan 2011 at 5:11pm

Have you checked what the stroke is? 4" is wd 4.5" wd45 crank. M&W ap46 is thw wd - wc part number I think.

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Allis orange blooded by family. Allis Diehard by choice

Posted By: mlpankey
Date Posted: 02 Jan 2011 at 5:29pm

alan-nj wrote:

As long as benny rasied the question, i thought i'd ask the same thing. i had the head off my 48 wd last week. this is the piston that is in it. 4 and 1/8 bore. obviously not original. made out of aluminum. can anyone identify the brand? are these m & w or some other brand? thanks alan

while you have the head off take a syringe in ccs and see how much fluid that dish holds and how far below the deck the outside ledge is at tdc for me . will you?

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people if they don't already know it you can't tell them. quote yogi berra

Posted By: alan-nj
Date Posted: 02 Jan 2011 at 6:18pm

mitch.. sorry, the head's back on the wd. but, i will be pulling my wc apart sometime this winter. the wc has the m&w ap48 pistons. let me know if you want those measured. allis fields...the wc has a 4 1/2 inch stroke, the wd has a 4 inch stroke. alan

Posted By: wi50
Date Posted: 02 Jan 2011 at 6:28pm

I think the M&W's hold about 70cc. I will check for sure, I have both AP46 and AP48 bead blasted and cleaned up. I'll take a piece of plexiglas and a syrenge and check for sure in the next day or two. I'll also post the compression height.

I know with the CC of the dish and the comp height, I figured them at just shy of 7.5 comp, but I didn't have any plexiglas and the CC measurement was only "close".

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"see what happens when you have no practical experience doing something...... you end up playing with calculators and looking stupid on the internet"

Posted By: Steve M C/IL
Date Posted: 02 Jan 2011 at 11:03pm

No plexiglass and allowing for surface tension,my sp48 M&W's held 83cc.The new sp48 sold by Hershal Adams held 90cc.