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Willys M Jeeps Forums


willysmjeeps.com :: View topic - Dating my block
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Dating my block

 
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davem201m38
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Joined: Jan 22, 2006
Posts: 423
Location: UK

PostPosted: Sun Nov 01, 2020 8:41 am    Post subject: Dating my block Reply with quote

Hello all,
I’m trying to date my M38 block. It is the later rear flange type modified for better fording i believe.
Behind where the drag link would be I have the following cast into the block.
2 6 D. Is the June 2nd 1952 ?

The long casting number is, 641087 L W 13A. N1 CR N2
Thanks, Dave.
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David Wigham
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RonD2
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Joined: Oct 02, 2014
Posts: 1006
Location: South Carolina, Dorchester County

PostPosted: Mon Nov 02, 2020 9:19 pm    Post subject: Reply with quote

Hi Dave,
Is there a serial number on the block (on the boss above the water pump) --- a MCXXXXX or RMCXXXXX number? That might be your best indication to zero in on a date of manufacture bounced against the known data base.

If the oil pan is off, I believe Willys also stamped a machining date into blocks on that mating surface on one of the corners near the rear main --- if I recall correctly. I believe that blocks were cast a long time before they were machined... (seasoning time).

I think casting numbers will only give you an early or late rough idea of the date of manufacture.

I'm sure Wes can add a lot more answers to your question. He must be busy..... Very Happy

Good luck!
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Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

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RonD2
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Joined: Oct 02, 2014
Posts: 1006
Location: South Carolina, Dorchester County

PostPosted: Tue Nov 03, 2020 11:59 am    Post subject: Reply with quote

And these posts might be helpful:

http://willysmjeeps.com/v2/modules.php?name=Forums&file=viewtopic&t=12599&highlight=rmc

http://willysmjeeps.com/v2/modules.php?name=Forums&file=viewtopic&t=6092&highlight=block+date
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Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

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Ryan_Miller
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Joined: Apr 03, 2005
Posts: 1577
Location: Kansas

PostPosted: Fri Nov 06, 2020 11:36 am    Post subject: Reply with quote

Ron is spot on.
I have the blue print for the block castings but it is extremely long and large so cannot post it.

Also do you have the water jacket hole at the back of the block, probably not since you have the later style mounting flanges.
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Ryan Miller
MVPA # 22010
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davem201m38
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Joined: Jan 22, 2006
Posts: 423
Location: UK

PostPosted: Sat Apr 03, 2021 4:40 pm    Post subject: Reply with quote

Hum, the water pump boss has no number,Which I thought odd. Where am I looking for the water hole in the back of the block?
Ta, Dave.
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David Wigham
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45auto
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Joined: Apr 06, 2005
Posts: 130
Location: Georgia

PostPosted: Sat Apr 03, 2021 5:37 pm    Post subject: Reply with quote

Your casting stamping of 2 6 D is February 6th 1952. Which tells you when the Block was cast, not when it was assembled.
What is the Date of Delivery on your M38?
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Harold W.
MVPA #6833
1945 GPW
1950 CJV-35/U
1951 M38 1952 M38
1962 USMC Contract M38A1
1953 Strick M100 1967 Johnson M416
1968 CJ5 4-Speed 1969 CJ5 V6
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wesk
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Joined: Apr 04, 2005
Posts: 15332
Location: Wisconsin

PostPosted: Sat Apr 03, 2021 8:16 pm    Post subject: Reply with quote

Dave,

The usual cause of the missing number on the water pump boss is a previous decking of the block during an overhaul. In many cases the missing numbers are actually still visible with a little bit of sleuthing about like a detective. Some dye penetrants and magnetic powder methods can make the number somewhat visible. Unfortunately without that number it is impossible to determine for sure that the engine you are looking at is original to your jeep.
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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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