[AJD] A John Deere Question

[greg at theoldtractorcompany.com]

Unlike the B's, the A's and G's, and to a lesser extent the D's, all retained the same bore 
size.
A's were 5.5" standard bore.

The book Marc mentions is indeed a worthwhile read for those who might not have a copy.
Very interesting
Greg



Greg Stephen
The Old Tractor Company
Stephen Equipment Company
PO Box 709
Franktown, CO 80116
303-663-5246
303-468-0377 FAX<<--GREAT WAY TO REACH ME!

On Tue Dec 13 23:00 , Chris C <jdnutinwa at yahoo.com> sent:

>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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>
>
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