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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: 419
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: 864
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: 864
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
Site Administrator
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Joined: Apr 03, 2005
Posts: 1548
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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