M&W rings for TO-30?

cole in OH · Feb 6, 2015

Ok after a while of being confused I finally figured out my tractor has m&w pistons in it. Does anyone know If I can get rings for them? Machine shop said the bore is 3 7/8 and I need 3 rings that are 3/32 and one 3/16. I have a complete sleeve-piston kit I literally just got but I figured if I could just use the old pistons I'd send the new stuff back doesn't matter either way but wouldn't hurt to save a few bucks.

Grandfatherjim · Feb 7, 2015

You can get rings for just about anything from Deves. However when you order, they will expect you to measure your pistons accurately. You may discover they are not what the machine shop guy told you....I'm betting.

Duner Wi · Feb 7, 2015

GMC 292 6 cyl 1963 -1989 had 3 3/8" bore.
Ring width are correct at 3/32 and 2/16.
They have 3 ring pistons so if you have 4 ring pistons as set for 6 cyl should yeild enough rings.
Here are some Sealed Power part #s. E-217K or E-217X.E 217 X is the economy ring set.
I would like to know how someone got that large of a piston in there.

Jason S. · Feb 7, 2015

(quoted from post at 05:24:42 02/07/15) Ok after a while of being confused I finally figured out my tractor has m&w pistons in it. Does anyone know If I can get rings for them? Machine shop said the bore is 3 7/8 and I need 3 rings that are 3/32 and one 3/16. I have a complete sleeve-piston kit I literally just got but I figured if I could just use the old pistons I'd send the new stuff back doesn't matter either way but wouldn't hurt to save a few bucks.

I have a set of the M&W power adder pistons for a TO-30. They are 3 3/8". I will even post a picture if you want.

cole in OH · Feb 7, 2015

A pic would be nice im pretty certain there was a miss
communication somewhere with me and the machine shop
when I set my new 3 3/8 pistons on top of the old m&w's they're
the exact same.

Duner Wi · Feb 7, 2015

CORRECTION that should read 3 7/8inch bore for 292 GMC .

cole in OH · Feb 7, 2015

Inside of the pistons say MP-23

Jason S. · Feb 8, 2015

(quoted from post at 22:51:06 02/07/15) Inside of the pistons say MP-23

Well it would depend on who cast the pistons as to what the number would be inside of them. Plus any revisions to the castings would change the number also. Here are some pics of the M&W 3 3/8" piston next to a current replacement 3 3/8" piston. The M&W piston has a lot more hours on it than the other one.

The ring widths are the same between the two pistons.

cole in OH · Feb 8, 2015

Those look the exact same as mine do you think the 3 3/8 rings
would fit them?

M&W rings for TO-30?

cole in OH

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cole in OH

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