Here is an engine I just bought.
First of all, believe me, I have done my homework, and have been searching all the internet these last 2 weeks for informations, without any success.
To make it simple: it's a Jeep block, wartime pattern, but it's not Willys, not GPW, not Hotchkiss, not post-war Willys. And…..it has a cast GPW 6015, without the script F, and with other unknown markings.
I have stripped it, everything inside was WOF, except manifolds (Willys), but this proves pretty much nothing because it has been rebuilt one or several times (bore +0.010, crankshaft -0.030), and has rivets for at least 3 plates on the oil pump side.
Here are the pictures:
Distributor side:
Note the GPW 6015 without the "-", and the 5H5 where there should be a script F
There is what looks like a date code: 6 10 49 (october 6 or june 10, depending on euro/us date writing). If it is 1949, Ford was not producing G503 engines, Hotchkiss/WOF didn't start theirs (1955 if I'm correct), and Willys was making different engines, and obviously not GPW marked.
The stamped serial looks like a french font, but the boss has been ground off, so it's not very helpful.
Oil pump side:
Nothing special, note the remains of rivets and unpainted areas, suggesting there were at least 3 plates.
Also note the flat top oil pump that looks like a Hotchkiss one for pinion distribution. Yes, this block was chain driven, and has been converted to pinion (??) as I'll show later.
Front side:
Here you can see the second hole in the water pump area.
Also very unusual is the modification made to fit the camshaft retainer for pinion drive, a weld has been done and machined to add some material for the bolt.
Rear side
I didn't see anything unusual here
There's a stamped number just under the head gasket surface
Top
Nothing special here,
There's a "L" next to each cylinder bore
It also looks like valve seats are a separate part, don't know if it's been rebuilt or built that way.
Bottom side:
Interesting things here!
Rear bearing cap is marked 011.113 and GPW 6325, but markings are different from the "classic" Ford pattern.
Also, no script F but a…..Mercedes star?? It's upside down, but looks like it.
The F marked bolt is the only "true" Ford part I've found in this engine.
The bearing cap has a stamped number:
Same one on the block close to the cap, followed by some kind of Mercedes star again, with "2 2 DSM"
There are two other similar stampings, one next to the oil strainer hole
And one on the other side of the rear bearing cap
SO…….any idea of what this block is??
The only small lead I have is here, where someone says that he has heard of GPW6015 engines built post war in Germany, but no proof or additional info was found.
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