[AJD] A John Deere Question

[Chris C]

Marc,


     After reading Greg's comments I should clarify
that when I refer to chance in piston size I meant
length and not diameter..  Greg is of course right
that the A bore is 5.5 throughout it's production.  

     One little thing  I noticed in the parts book, is
that oversized pistions for the A's from 488,000 to
584,000 will fit all the unstyled AR and AO
applications..

      Another curious thing, the machine shop that is
boring my block for my 48 A is working on a 50 AR for
another customer and they said you had to machine .104
off of an A piston the get it to fit the AR (late
styled on both applications)  The parts book shows the
same pistons used for A and AR/AO from 584,000 up and
272,000 and up.  Oh well..  too much time on my
hands.. 

                       Chris
 

--- Chris C <jdnutinwa at yahoo.com> wrote:

> Hi Marc,
> 
>    According to the parts manuals I have the A61R
> (sub
> for AA3705R) was used from serial numbers 410,000 up
> to 487,999 so that's 1936 through 1939 or all the
> unstyled A's.  I have a set of these in the garge, 
> they measure 7 5/8 long with the 5 1/2 inch bore and
> use the 1/4 rings.
>     The next standard bore piston was the A2338R
> piston.   that covers your 1940 to part way through
> 1947A's.  I don't have any standard bore pistons to
> measure,  but I have a set of 45 over for the same
> serial number range they are 3/16 of an inch longer
> than the early pistons.  
> 
>      If you move to the late styled A pistons
> (standard) A3283R,  they 3/8 of an inch longer yet
> than then 40-47 pistons.  
> 
>      According to my Model A book,  at Serial number
> 488,000 the stroke was increased by 1/4 inch,  so I
> am
> betting that also caused the change in piston size. 
> At 584,000 the piston size increased again,  but the
> stroke remained the same.
>  
>       Hope that helps you out.  
> 
>                      Chris
> 
> --- marc <mraasch at hickorytech.net> wrote:
> 
> > I need to know the size of pistons on a JD 39-40
> > tractor compared to
> > a JD 45 A Thanks
> > 
> > I also have a book listed on Ebay called a history
> > of John Deere's Company. 
> > would maka a christmas present for some one
> > #7202686674
> > Marc Raasch
> > St Peter Mn 56082
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