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Number on Motor

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Chip T View Drop Down
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    Posted: 18 Nov. 2018 at 12:50pm
First post so...
Working on my 47 ACJ2A and finally got all the crud off.  

Motor number# 641087-L-W4 AN1-GR-N2  (CC is above the W4)

What does all this relate too.  Thanks for any help.  New to this.

Chip
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Lee MN View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lee MN Quote  Post ReplyReply Direct Link To This Post Posted: 18 Nov. 2018 at 12:53pm
641087 is your typical hear driven cam 2A-early 3A Engine, what’s the S/N stamped behind the water pump ?

Lee
               LEE
44 GPW-The Perfected Willys
49 2A
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ndnchf Quote  Post ReplyReply Direct Link To This Post Posted: 18 Nov. 2018 at 1:07pm
As Lee mentioned, the motor number is behind the waterpump, on the top of the block. It should look something like this.

1948 CJ2A - It goes nowhere fast, but anywhere slow.
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mbullism View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mbullism Quote  Post ReplyReply Direct Link To This Post Posted: 18 Nov. 2018 at 2:35pm
Welcome Chip Smile... just a  quick pile on.  The number you listed is the casting number.  The 641087 is specific to the version of the block, L for L134(?), the rest is rumored to identify the foundry (W4 for Wilson #4?) and the balance is metal composition(?).  Lots of discussion, but I personally don't recall reading anything definitive.  It really does little to identify an individual engine beyond general jeep models (or even Kaiser automobiles).  The serial number at the waterpump is an individual identifier, but even still can't be tracked back to an individual jeep, we just don't have those records if they ever existed.  Best bet is the database here on the 2apage to narrow down a range of matches...

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Edited by mbullism - 18 Nov. 2018 at 2:47pm
Those who do not learn from history are doomed to repeat it... Welcome to 1930's Germany
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Post Options Post Options   Thanks (0) Thanks(0)   Quote athawk11 Quote  Post ReplyReply Direct Link To This Post Posted: 18 Nov. 2018 at 3:30pm
I have been unofficially monitoring the Wilson Foundry number for patterns.  Although there are anomalies, the earlier engines tend to have a smaller "W" number.  The later engines tend to have larger "W" numbers.  

I'm not sure what this says about the manufacturing process.
1- 1946 CJ2A   
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ol' Unreliable Quote  Post ReplyReply Direct Link To This Post Posted: 19 Nov. 2018 at 3:19am
Welcome to the page, Chip T!
There's a reason it's called Ol' Unreliable
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