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Engine assy nos |
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Bob W 
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 Posted: 05 Sep. 2022 at 8:13pm |
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It is a replacement engine for an
Edited by Bob W - 06 Sep. 2022 at 8:08pm |
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oldscot3
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Posted: 06 Sep. 2022 at 4:17pm |
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I was looking at the pic of the serial and noticed some red/orange just above on the head. Would you guys think, like me, that the block and head were primered red before being painted black?
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James 4:6 God resists the proud, but gives grace to the humble.
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Bob W
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Posted: 06 Sep. 2022 at 8:06pm |
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Most likely that engine has block casting number 908756 and the Willys part number for the assembly is 908759.
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Bob W
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Posted: 06 Sep. 2022 at 8:07pm |
Yes. People often think the engines were originally red because of this.
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Joe Friday
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Posted: 06 Sep. 2022 at 8:18pm |
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Bob,
If you have a chance, look at 911911. It should have a description.
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Joe Friday
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Posted: 07 Sep. 2022 at 2:32pm |
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Apparently there were at least 8 different MB crate motor versions depending on accessories. The right side of this huge spreadsheet lists the bill of materials for all the accessories for each.  |
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Ron D
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Posted: 07 Sep. 2022 at 3:02pm |
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Interesting document. Thanks for posting. MC is the Willys model designation for the M38. I wonder if that crate motor is chain drive or gear drive.
Edited by Ron D - 07 Sep. 2022 at 3:06pm |
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1951 M38
1951 M100 |
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mbullism
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Posted: 07 Sep. 2022 at 4:51pm |
#'s 32 and 33, ("Ext. Valves Seat Inserts)... 908756
 Edited by mbullism - 07 Sep. 2022 at 4:52pm |
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Those who do not learn from history are doomed to repeat it... Welcome to 1930's Germany
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Joe Friday
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Posted: 07 Sep. 2022 at 6:37pm |
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It would be gear drive.
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Ron D
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Posted: 07 Sep. 2022 at 7:30pm |
How can you tell? (I would've guessed the serial number points to it being chain drive) Could be mistaken, but I'd guess the Army wouldn't put a chain drive motor into an M38 under any circumstance. Motors described as "MB-MC" on that list.......I can understand the accessory differences between an MB and MC L134, those are fairly easy to reconfigure.....but the different front mounting plates isn't so easy.
Edited by Ron D - 07 Sep. 2022 at 7:40pm |
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1951 M38
1951 M100 |
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Joe Friday
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Posted: 07 Sep. 2022 at 7:36pm |
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Well I guess that give me a reason to look up the BOM and post the part numbers afterall.
I guess if I mentioned that the spreadsheet was from 1964 and the new crated engine was 1967 I doubt they would go backwards and switch back to Chain, Plus it is a generic replacement engine for MB and MC, (even though there are more listings for MC...
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Ron D
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Posted: 07 Sep. 2022 at 7:42pm |
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Government packaging markings can be cryptic. That 1967 date could very well mean the last inspection or packaging date (nothing to do with when it was originally made or rebuilt-overhauled). Would the Army put a gear drive motor into an MB? That sure would make the MB manual obsolete, even if it didn't confuse the mechanics. Thanks for any additional info you can provide. Interesting!
Edited by Ron D - 07 Sep. 2022 at 7:46pm |
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1951 M38
1951 M100 |
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Bob W
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Posted: 07 Sep. 2022 at 8:00pm |
 Screen shot from Ord 9 SNL G-503 MB GPW Jeep 1949
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Ron D
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Posted: 07 Sep. 2022 at 8:28pm |
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Learn something new every day. Thanks! I wasn't aware that the Army made the complete switch from chain to gear drive motors (including the manuals). It makes sense, considering the number of MB-GPW's that must've still been in active and guard service after the war, post 1945 and into the 1950's. They only made about 65,000 M38's ---- not nearly enough to replace all those MB-GPW's.
Edited by Ron D - 07 Sep. 2022 at 8:30pm |
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1951 M38
1951 M100 |
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Joe Friday
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Posted: 07 Sep. 2022 at 8:39pm |
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The table gives groups, and BOM reference.
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Bob W
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Posted: 07 Sep. 2022 at 8:40pm |
I don't think they made a "complete switch". Most of the Jeeps in Korea were G503s with chain drive engines. After a while the Army needed more spare parts. Willys didn't back date their current engine when supplying replacement engines, so there were both original chain drive and also replacement gear drive engines.
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Joe Friday
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Posted: 07 Sep. 2022 at 8:41pm |
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So the Camshaft is 211-D, which is BOM 6006, which is a gear drive camshaft.
 Edited by Joe Friday - 07 Sep. 2022 at 8:42pm |
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Ron D
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Posted: 07 Sep. 2022 at 8:41pm |
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Which still kind of raises the question if that 1967 crate motor is gear or chain drive (without an inspection or seeing the block casting number). Would the Army have scrapped otherwise fresh (new or rebuilt) stock of chain drive L134's --- or would they have used them up first when a MB needed a motor? Seeing these old documents is awesome!
Edited by Ron D - 07 Sep. 2022 at 8:46pm |
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1951 M38
1951 M100 |
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oldscot3 wrote: