John deere B pistons

newJd4430 · Dec 10, 2014

Does anyone have a chart that will tell the
measurements for different size john deere B pistons
not all brands stamp the size in the top when they
manufacture them. I would also like to find a chart
for john deere model A tractors as well

Mike M · Dec 11, 2014

Most generally when no oversize is stamped on the top they are standard pistons. You can confirm these by the casting numbers on the inside of the skirt to the part numbers in the description line of parts book under the kit number.
B's were made in 4 1/4" bore , 4 1/2" bore and 4 11/16" bore. The unstyled were 4 1/4" and IIRC could be had in .030" over. The rest Deere only ever offered .045" over. Aftermarket offered std.,.045,.090, .125 a measurement of the skirt 90* to the wrist pin and add around .006" for clearance will pretty much tell you what you got.

A's were all 5 1/2" bore.

JOCCO · Dec 11, 2014

Mid production B was 4 1/2 late production 4 11/16

newJd4430 · Dec 11, 2014

I have a set of John deere B pistons that have no stamp and are marked with the number A1239 on the side any idea of brand an rather or not they are oversize or not i cant find that number anywhere an i think i see the stamp GEP or Cep on the side of piston as well

Mike M · Dec 12, 2014

Are they cast iron or alum ?
Can you post a picture of them ?

John deere B pistons

newJd4430

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JOCCO

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