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J series engine number lookup

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J series engine number lookup
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Harleygaz
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Joined: Jul 18, 2019
Posts: 15
Location: Mississippi, near Memphis TN

PostPosted: Mon Aug 12, 2019 8:24 am    Post subject: J series engine number lookup Reply with quote

My M38 has a J series engine. Is there a database for these engines where I could find the year etc?
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Gary
M38 - May 1952
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mbullism
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Joined: Jul 14, 2015
Posts: 30

PostPosted: Mon Aug 12, 2019 9:16 am    Post subject: Reply with quote

J series is a CJ2a engine. I'm not aware of a database specific to ESNs, but you may be able to narrow it down seeing where it fits in the 2A database...

http://cj-2a.com/parts_list/CJ2A_data.php
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wesk
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PostPosted: Mon Aug 12, 2019 11:11 am    Post subject: Reply with quote

Post the full serial and casting numbers so we can offer a more precise answer. The J series engines came in several flavors, JXXXXX, CJXXXXX, CJ2AXXXXX, 3JXXXXX to name a few. Since Willys did not match engine serials to chassis serials as the GPW did during WWII Willys jeeps both military & civilian can only estimate approximate engine serials by date.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php


Last edited by wesk on Tue Aug 13, 2019 8:48 pm; edited 1 time in total
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Harleygaz
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Joined: Jul 18, 2019
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Location: Mississippi, near Memphis TN

PostPosted: Mon Aug 12, 2019 2:16 pm    Post subject: Reply with quote

Engine number is J156681. I donít have the casting number right now. Iíll get it tomorrow morning.
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Gary
M38 - May 1952
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Harleygaz
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Location: Mississippi, near Memphis TN

PostPosted: Tue Aug 13, 2019 8:54 am    Post subject: Reply with quote

The casting number is under the oil filter bracket which I donít want to remove. I have pictures of the head and block. I read the faq on posting pictures but I have no idea how to put them in a public access space on the internet. Any suggestions?
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Gary
M38 - May 1952
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mdainsd
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PostPosted: Tue Aug 13, 2019 1:46 pm    Post subject: Reply with quote

wesk wrote:
Since Willys did not match engine serials to chassis serials as they did during WWII with the MA/MB post WWII jeeps both military & civilian can only estimate approximate engine serials by date.


I cannot speak to the MA as I have never researched them. But the MB chassis and engine numbers do not match. The engine number is higher than the chassis number and that numerical difference continued to climb through production.

The Ford GPW however, had matching serial number plate, stamped frame number and stamped engine number throughout production.
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mbullism
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PostPosted: Tue Aug 13, 2019 3:05 pm    Post subject: Reply with quote

ESN J156681 seems to fit the 2A database late '47, right around 2A SN 146428 with ESN J156598A...the optional comments provided show that jeep purchased new 12/22/47

I think to get any "closer" you'd have to sift for published ESNs above and below in the service bulletins and interpolate. If you pull the oil pan you may find a machining date on the block back by the rear main, the month will be a letter code if there
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wesk
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PostPosted: Tue Aug 13, 2019 8:45 pm    Post subject: Reply with quote

Quote:
But the MB chassis and engine numbers do not match.

My BAD I meant to say GPW but I confused the issue while remembering that WWII willys were the only ones that used a frame serial along with a matching dash serial plate.

The casting number on the head under the oil filter bracket is for the HEAD!

The block casting number is easily read:



As was mentioned above, the vehicle serials did not match the engine serials. Not mentioned above, was the serials are consecutive for all L134's and the only thing that changes are the prefixes. Therefore interpolating is not an easy task. For example using the M38 and the 641087 casting serial numbers are all consecutive even though some have the prefix MC, or RMC, or 3J. In this case we could assume 5,000 consecutive serials got the prefix MC then the next 2,000 may have gotten the prefix 3J and then the next 1,000 the prefix MC. To decipher the CJ2A data base or the M38 data base you can only look for several liste jeeps of the same model with engine serials very close then you could assume it is reasonable that those similar serialed engines were produced and installed in that small group of jeeps and the other engine serials that were not close were obviously not used during that period. The other problem is engines were not withdrawn from assembly line stocks in any certain order.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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wesk
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PostPosted: Tue Aug 13, 2019 8:58 pm    Post subject: Reply with quote

Quote:
ESN J156681 seems to fit the 2A database late '47, right around 2A SN 146428 with ESN J156598A...the optional comments provided show that jeep purchased new 12/22/47


Can you post the link for that data base?
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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mbullism
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PostPosted: Wed Aug 14, 2019 10:49 am    Post subject: Reply with quote

wesk wrote:
Can you post the link for that data base?


In my post above and repeated here:

http://cj-2a.com/parts_list/CJ2A_data.php

If you scroll the page globally there is a horizontal scroll bar at the bottom so you can reveal the ESN column, and I find it easier to scroll the ESN to the left to be adjacent with the years and SNs... If you click on the blue SN for any jeep it brings up a summary page for that individual jeep with all of the table info (sometimes easier than scroll left and right)

It's a bit easier to interpolate 2A's because there weren't so many pulls on the output stream, but I generally feel like interpolating a day is really more than likely identifying a week.
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wesk
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PostPosted: Wed Aug 14, 2019 12:46 pm    Post subject: Reply with quote

My BAD. Sorry about that. Didn't connect your 2nd post with your 1st post. I'll do my best to not miss that again.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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Harleygaz
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Location: Mississippi, near Memphis TN

PostPosted: Wed Aug 14, 2019 3:48 pm    Post subject: Reply with quote

Casting number is 641087. To the left of it (towards the rear of the engine) is 6. Engine number definitely only has a J prefix, no other letters. I checked the transmission and transfer box and they have the fording vent lines so I think the swap was just the engine, manifolds, carb and exhaust. Bell housing doesnít seem to be the watertight version from the M38.
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Gary
M38 - May 1952
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mbullism
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PostPosted: Wed Aug 14, 2019 5:02 pm    Post subject: Reply with quote

wesk wrote:
My BAD. Sorry about that. Didn't connect your 2nd post with your 1st post. I'll do my best to not miss that again.


Please, lol... (didn't mean it that way, but I see it now Embarassed )
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mdainsd
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PostPosted: Wed Aug 14, 2019 5:27 pm    Post subject: Reply with quote

Early M38s didn't have a waterproof bell housing.
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1952 Dodge M37, 1942 MB script, 1948 FrankenJeep CJ2A/M38, 1951 M38, !942 WC-57 Command Car Undergoing factory original restoration, 1944 WC-51 Weapons , (2) M1941 Sperry 60" Anti-Aircraft Searchlight, John Deere M-gators
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Harleygaz
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PostPosted: Wed Aug 14, 2019 5:44 pm    Post subject: Reply with quote

Mine is serial 69581, May 1952. Judging from what Iíve read it must have been within the last 3000 made.
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Gary
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