Belly Numbers

[aumick10]

I have some J/JD cases that have different types of belly numbers.

The earlier cases have two letters before the number sequence, while the later ones have a self explanetary two numbers for year stamped format.

My question is do the earlier letter codes relate to any years that they were stamped, similar to transmission date stamping.

Thanks

[Chris Haynes]

I bet George Hood can answer that.

[duffeycycles]

I had 2 1915 J motors,early & late & the bottom numbers looked like different format from each other
An early 1920s right case on my wall has B3 space 890 bottom number..my clock!

[aumick10]

I have a set of cases labeled XO-xxx belly no, with a 25JD engine no.
Also a drive case with a H4-xxx belly no and a 24JD engine no.

[MMasa]

The number after the letter is a year code. It is the year in which the line bore number was STAMPED and could be a year earlier than the model year of the engine.
Your X0 / 25JD case is a mystery. Can you post a pic of the vin and the line bore number?
Is it a large base case? Does the vin look factory or like a re-stamp?
Mark

[duffeycycles]

Thanx Mark,I thought this was a 23 case

[aumick10]

The number after the letter is a year code. It is the year in which the line bore number was STAMPED and could be a year earlier than the model year of the engine.
Your X0 / 25JD case is a mystery. Can you post a pic of the vin and the line bore number?
Is it a large base case? Does the vin look factory or like a re-stamp?
Mark

Thanks mark, I will get a photo later today.

[aumick10]

Here are some Photos of my 25JD cases.
I suspect the X0 belly number is correct as a set of 1920 cases.
The VIN no boss looks to have been removed at some stage and restamped, or it is a set of replacement cases that were stamped by the dealer.
20191025_150320.jpg20191025_150302.jpg

[Chris Haynes]

[QUOTE=aumick10;184764]Here are some Photos of my 25JD cases.
I suspect the X0 belly number is correct as a set of 1920 cases.
The VIN no boss looks to have been removed at some stage and restamped, or it is a set of replacement cases that were stamped by the dealer.


It is definitely a number job.

[aumick10]

I though it was after I measured the cylinder studs. It is a small base case that I don't think existed in 20, If the XO is a 1920 belly no.

[MMasa]

The 25 VIN is NOT factory for sure. Also, ALL cases 1924 and up are large base.
The x is still a mystery as I've never seen a belly marking letter that high.
It looks factory but your picture is a bit blurry.
I'm going to say that it's a 1920 or 21 case that had the line bore markings stamped in 1920.
Mark

[aumick10]

I agree on the VIN.
The cases have matching belly no's X0-695.
They also have casting marks of 2-18W and 2-18A.
I am sure they are factory belly numbers.
20191026_080815.jpg

[MMasa]

I agree, those are factory belly numbers. I've just never seen an X before.
Mark

[aumick10]

Thanks Mark.
Are you looking for contributions to your book?