Question On An Engine Nnumber

[dadsjeep]

My Dad passed some thirty plus years ago. I've been hauling his rolling chassis (He tossed the body and serial no. plate) of what was told to me as a '52 CJ3A around since than.  I finally have the time and need to finish the renovation that he started so long ago.  I have some questions.  The casting number on the block is 638632 W4 A N1-CR-N2 with a small CC above the W4.  It's a clock block that reads 12 2. The serial number above the water pump appears to be J-80966 with the small numbers of 04-  00 in the lower right hand corner.  The head has " Firing Order 1-3-4-2, Tappet Clearance Engine Cold Intake 014 Exhaust 014" with the numbers "10 13, 840161 Z (or N on it's side), W8" on the front top of the head.  I think this is an MB engine.  It has the Purolator oil filter(with Military Products stamped on the cover)  on the left front.  Does any of this tell me what year this engine is or what it is?  The date on the transmission shows 4-29-49.  Thanks for the help.  

[rocketeer]

By the numbers that appears to be a 1946/47 CJ2A engine. Take a look at the front timing cover. Does it have a bump in the center or a rivet? If it has a bump it's a gear driven engine which would definitely make it a civvy engine.

Larry

[dadsjeep]

Larry, it is gear driven.  By chasing info on the numbers for the generator, starter, rear axle, transmission and transfer case shifter shapes and lengths, and some other things, I think I can safely say, excluding the block and head, that this is a '49.  Because I do not have the body, I'm still not sure if it is a 2 or 3A.  When you said 'By the numbers that appears to be a 1946/47 CJ2A engine', what did those numbers say to tie it down to a 2A for those years?  Is there anything about the rolling chassis that would tell me 2 or 3A?  I can see this will be a long process and I really appreciate your help.  Terry

[rocketeer]

By the numbers I meant the serial number and the casting number. The casting number indicates a carry-over from the WWII engines. The same WWII  block casting was used in early 2A production. No MB engines were gear driven so that puts it as a civvy.

As far as the frame, are there two tangs on the front crossmember for the radiator? If not that would indicate a 3A frame. If there are it still doesn't answer the question as early 3A's still had the bottom mount rad.

Since things seem to point to a 1949, does it have a Dana 41 rear diff?

Larry

[dadsjeep]

Larry, It is a bottom mount radiator.  The support rod to the cowl is still attached.  And yes it's a 41 differential.  The cover is round instead of the squared sides of a 44.  I'll wait for your next clue!  Terry