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A659 exhaust manifold

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Post Options Post Options   Thanks (0) Thanks(0)   Quote ndnchf Quote  Post ReplyReply Direct Link To This Post Topic: A659 exhaust manifold
    Posted: 26 Nov. 2021 at 9:45am
I'm trying to identify the application of this exhaust manifold. I've seen a several discussions on the net about A659 manifolds, but they talk about the A659 number being on either the outer right wing or below the heat flapper chamber. This one has it on the back side (facing the block). Can anyone provide insight into its application? Thanks. Steve


1948 CJ2A - It goes nowhere fast, but anywhere slow.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cpt logger Quote  Post ReplyReply Direct Link To This Post Posted: 28 Nov. 2021 at 3:38am
Why would it matter where the casting number is?

How many suppliers of this manifold did Willys use anyway?

Was this a Willys made part? If made by Willys, who know when they changed the casting number location & why.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ndnchf Quote  Post ReplyReply Direct Link To This Post Posted: 28 Nov. 2021 at 5:40am
All good questions - inquiring minds want to know!  I'm just curious, since all the others I've seen have the number in a different location.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bruce W Quote  Post ReplyReply Direct Link To This Post Posted: 28 Nov. 2021 at 2:39pm
IIRR, Willys-Overland owned Wilson Foundry, so you could say it was a Willys-made part. Maybe wherever the guy making the mold pattern or the guy setting up the mold felt like putting the number on any given day is where the number wound up. The boss probably didn’t care as long as it got on there somewhere. Don’t forget, these and all parts and the complete jeep were made by people, and each person may want his product to be slightly different from others. A659 is a casting number, what is the part number? May or may not be the same. If the CJ2-A part number is the same as the MB part number, same as the casting number or not, it’s the same part. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SE Kansas 46 CJ-2A Quote  Post ReplyReply Direct Link To This Post Posted: 28 Nov. 2021 at 3:15pm
The actual part number for the CJ-2A exhaust manifold assembly was A-912 according to the 3rd edition parts list for models CJ-2A and CJ-3A copyright 1949, page 29.

This would probably include the manifold heat control parts if I am reading the parts manual right. Apparently the manifold itself was not supplied as a bare part. A-659 may have been the original bare manifold part number...or not. Usually casting numbers are put on a raw casting to tell the machine shop what engineering drawing to refer to for machining dimensions, The casting number is almost always not the actual finished part number but may be close to the same number.



Edited by SE Kansas 46 CJ-2A - 28 Nov. 2021 at 3:23pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TERRY Quote  Post ReplyReply Direct Link To This Post Posted: 28 Nov. 2021 at 4:15pm

According to Fred Coldwell, who ought to know, A-659 was the original military # for the MA and MB. And was only the sub assembly you have. It was not available as a separate replacement part and A-912 is the complete   assembly .
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bruce W Quote  Post ReplyReply Direct Link To This Post Posted: 28 Nov. 2021 at 5:54pm
Originally posted by TERRY TERRY wrote:


According to Fred Coldwell, who ought to know, A-659 was the original military # for the MA and MB. And was only the sub assembly you have. It was not available as a separate replacement part and A-912 is the complete   assembly .

As Kansas said, every casting got a casting number, and if it was offered as a single part, the casting number often became the part number. If more parts were added, as in the heat control parts, it became an “assembly” and got a new part number. 
  Any MB part used as-is on the CJ2-A kept its A-XXX MB part  number. Any part that was altered from its MB configuration or designed new from scratch was issued a new 5- or 6-digit all-number part number. So the CJ2-A exhaust manifold is a carried-over MB part with the same casting number and the same part number. 
BW 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ndnchf Quote  Post ReplyReply Direct Link To This Post Posted: 29 Nov. 2021 at 7:44am
Thanks guys.  It doesn't really matter, its just a spare in my parts bin.  With the unusual location of the A659 casting, I thought it might be a rare variation worth millions Wink  Apparently not.  Oh well, back on the shelf it goes. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SE Kansas 46 CJ-2A Quote  Post ReplyReply Direct Link To This Post Posted: 29 Nov. 2021 at 7:57am
My theory of the evolution of A-659 or whatever the original bare manifold part number was is that it may have been supplied bare in the original MB but due to problems in the Army field maintenance shops during the war it was faster to have the manifold supplied with heat parts to get equipment back in service quicker...so, A-912 was supplied as the replacement assembly at some point during the war. It then carried over after the war to the CJ series.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Joe Friday Quote  Post ReplyReply Direct Link To This Post Posted: 30 Nov. 2021 at 6:38am
Cast After July 1948... (most likely) more info to follow
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Stev Quote  Post ReplyReply Direct Link To This Post Posted: 30 Nov. 2021 at 8:15am
"Cast After July 1948... (most likely)"  

I love for this kind of data.  So leaping conclusions - The majority of the Lefty's would have the A659 number on the outside of the exhaust casting.

Of course there are examples of Willys using the First In Still Here inventory system.  Which leads to whatever is handy that day being moved other floor for the production build.  Shortages lead to older stuff showing up on the line.  Nothing is absolute. 


Edited by Stev - 30 Nov. 2021 at 8:16am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Todd Paisley Quote  Post ReplyReply Direct Link To This Post Posted: 01 Dec. 2021 at 7:39pm
If the name of the part is an "assembly", that means it is made up of multiple parts.  The A-912 Exhaust Manifold is an assembly.  A-659 is the part number for the raw exhaust manifold.

A-912 Exhaust Manifold Assembly is made up 10 parts:

1) A-5565 Exhaust Manifold & Bush. Assembly - This is made up of 2 parts:
a) A-659 Exhaust Manifold
b) 636438 Heat Control Valve Shaft Bearing

2) 636439 Heat Control Valve
3) 637206 Heat Control Valve Shaft
4) 637208 Heat Control Valve Bi-Metal Spring
5) 637209 Heat Control Valve Bi Metal Spring Washer
6) 637210 Heat Control Valve Counter Weight Lever
7) 637211 Heat Control Lever Key
8) 5272 Screw Mach. Rd. Hd. #10-24 Thd. X 3/4 (G.M. #110502) (Clamp Lever to Shaft)
9) 6352 Hex. - Nut #10-24 Thd. (G.M. #110633) (Exhaust Pipe to Flange to Exh. Manifold Flange)
10) 332515 Stud - 3/8-16 Thd. X 1-3/8 Long (Exhaust Pipe to Flange to Exh. Manifold Flange)

On the other side is the date code for when it was cast.
Todd Paisley

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Post Options Post Options   Thanks (0) Thanks(0)   Quote ndnchf Quote  Post ReplyReply Direct Link To This Post Posted: 01 Dec. 2021 at 7:50pm
I've looked it over pretty good. I see no date code anywhere. Can you post a photo of a date code on one? I'd like to see exactly where it should be. Thanks.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Todd Paisley Quote  Post ReplyReply Direct Link To This Post Posted: 01 Dec. 2021 at 8:11pm
Yours looks like either a later or reproduction one.  You will see 2 circles with numbers in them on the original ones.  It is the month and date.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote ndnchf Quote  Post ReplyReply Direct Link To This Post Posted: 02 Dec. 2021 at 4:57am
Thanks. I see no casting dates on this one. Only the A659 in that location.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ndnchf Quote  Post ReplyReply Direct Link To This Post Posted: 05 Dec. 2021 at 7:44am
Originally posted by Joe Friday Joe Friday wrote:

Cast After July 1948... (most likely) more info to follow

Hey Joe - I'm interested to hear the "more to follow" Smile
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