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Steering Wheel Restoration
M38A1 Fuel tank sender and pickup mounting rings
M38 fuel shut off
M38 fuel shut off
USAID Plate
Locating exact hole locations on tub mounts
Painting advice needed - Step by step
What is painted black on a M38A1?
MB cylinder head 42-44 casting 660C
Fuel primer

Willys M Jeeps Forums


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willysmjeeps.com Forum Index
Author Message
  Topic: M38 engine
mbullism

Replies: 10
Views: 12531

PostForum: Technical Knowledge Base   Posted: Fri Jan 17, 2020 8:48 am   Subject: M38 engine
If it's not uncommon for a block to be decked during a rebuild thereby skimming off the serial numbers, what would a good engine rebuilder/restorer due to preserve this valuable information?

It's a ...
  Topic: Got the new valve in.
mbullism

Replies: 5
Views: 1400

PostForum: Technical Knowledge Base   Posted: Sun Dec 15, 2019 9:21 am   Subject: Got the new valve in.
I know that guy. ...

I AM that guy Smile
  Topic: RMC engine mount Jeep vs generator
mbullism

Replies: 10
Views: 1756

PostForum: Technical Knowledge Base   Posted: Thu Nov 28, 2019 5:02 am   Subject: RMC engine mount Jeep vs generator
All that used the 804380 start with serial 10001 and go from there until production ends irregardless of model jeep and engine serial prefix. Same goes for each of the other castings 641087 and etc.
...
  Topic: RMC engine mount Jeep vs generator
mbullism

Replies: 10
Views: 1756

PostForum: Technical Knowledge Base   Posted: Wed Nov 27, 2019 1:18 pm   Subject: RMC engine mount Jeep vs generator
...Willys blocks were all serial sequentially no matter what prefix was used ...

I've read that for MC/RMC blocks... this holds for all of them? J/3J/4R/U/T/RJ/etc.?
  Topic: Piston overbore sizes?
mbullism

Replies: 4
Views: 1316

PostForum: Technical Knowledge Base   Posted: Fri Oct 25, 2019 9:03 am   Subject: Piston overbore sizes?
(assuming L-134, and that you don't have a letter in your ESN...)

[ETA: sorry, was typing when you posted]

TM 9 1804A page 121 re: the block itself says 3.125-3.127 bores when new, rebore to ne ...
  Topic: RMC Engine
mbullism

Replies: 5
Views: 1970

PostForum: Technical Knowledge Base   Posted: Tue Sep 03, 2019 1:05 pm   Subject: RMC Engine
I'll give you a slightly different take, and you can do what you want, lol.

If your rubber/plastic in the fuel system is NOS or similar then ethanol free is the way to go. Most modern fuel line/pu ...
  Topic: Stamped code 3w on cylinder block top surface
mbullism

Replies: 6
Views: 2001

PostForum: Technical Knowledge Base   Posted: Wed Aug 21, 2019 8:46 am   Subject: Stamped code 3w on cylinder block top surface
Gary... is that you? Wink

http://mywillyspics.com/images/2019/08/21/3w-stamp.jpg
  Topic: Gen set with 641087 casting RMC engine?
mbullism

Replies: 5
Views: 1727

PostForum: Technical Knowledge Base   Posted: Fri Aug 16, 2019 1:53 pm   Subject: Gen set with 641087 casting RMC engine?
Hmmm... I'm finding order numbers of my format over on the "G", to the extent that I now think the "11" is likely the eleventh week of '51, not the month. Military or civilian number not as importan ...
  Topic: Gen set with 641087 casting RMC engine?
mbullism

Replies: 5
Views: 1727

PostForum: Technical Knowledge Base   Posted: Fri Aug 16, 2019 11:58 am   Subject: Gen set with 641087 casting RMC engine?
Order number 13104-PHILA-51-11, not delivery date.. I do understand what you're saying about stocking engines at depots... my assumption is that Onan signed a contract to deliver "X" number of generat ...
  Topic: Gen set with 641087 casting RMC engine?
mbullism

Replies: 5
Views: 1727

PostForum: Technical Knowledge Base   Posted: Thu Aug 15, 2019 7:32 am   Subject: Gen set with 641087 casting RMC engine?

The 641087 series block introduced under a test run in Jan 52 for 100 engines then finally officially started production in Feb 52. This block was erroneously labeled with casting # 641087 while it' ...
  Topic: J series engine number lookup
mbullism

Replies: 15
Views: 3517

PostForum: Technical Knowledge Base   Posted: Wed Aug 14, 2019 5:02 pm   Subject: J series engine number lookup
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 )
  Topic: J series engine number lookup
mbullism

Replies: 15
Views: 3517

PostForum: Technical Knowledge Base   Posted: Wed Aug 14, 2019 10:49 am   Subject: J series engine number lookup
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 ...
  Topic: J series engine number lookup
mbullism

Replies: 15
Views: 3517

PostForum: Technical Knowledge Base   Posted: Tue Aug 13, 2019 3:05 pm   Subject: J series engine number lookup
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 ...
  Topic: J series engine number lookup
mbullism

Replies: 15
Views: 3517

PostForum: Technical Knowledge Base   Posted: Mon Aug 12, 2019 9:16 am   Subject: J series engine number lookup
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
  Topic: Pressure plate/flywheel bolts
mbullism

Replies: 12
Views: 7165

PostForum: Technical Knowledge Base   Posted: Wed Sep 20, 2017 11:35 am   Subject: Pressure plate/flywheel bolts
"A" is most likely ASTM A307 Grade A, typical mild steel hardware store bolt... these are typically unmarked, but not always

"BC" is probably ASTM A354 Grade BC, think "better" than SAE J429 grade ...
 
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