willysmjeeps.com

ok started on our M38 restoration, 4 wheels now on and it rolls, redid valves, and general work on engine (still need many parts to complete, did a quick check got it to fire and start, enough with that), found someone close by who had a engine that ran but not well, picked it up, its on a stand right now, here are some numbers taken off of it:

Engine main block Data plate:
Red but badly worn:
CJ2A
905979
RJ-291957

stamp on block (above water pump) RJ291957 (hay it matches the data plate)

on Driver side Low rear (in casting) 12T 4-6 F

Passenger side Low on casting 804380-W-12-D-PS CU CR

On engine head (not sure if correct head)
Jeep Willy's 1-23 W5 640161
Tapet Clearance Intake 14, Exhaust 14

Exhaust manifold (some of this is hard to make out in casting) 4-659 (Not sure about first "4")


so the main pulley with nut has been welded together, so cannot easily pull off the nut, is this a chain drive or gear drive (I think gear drive)?
It is a double pulley on the bottom, but water pump has more of a deep MB single pulley on it.

Any ideas or info would be great!

We are off to pull the water pump off now as it seems there is a bearing gone in it (can feel when turn over by hand there is a slight wobble)

thanks for all your help!

804380 was the next to last L134 casting used. It was used from about early 1952 through about 55. The R in the serial RJ291957 represents a factory new replacement engine for a CJ. The plate that is installed with drive nails is usually a rebuild plate from a local engine shop and has nothing to do with the fact the engine was a new replacement from the factory. The crank shaft double pulley, is it two narrow pulleys or one wide and one narrow?

I'll try and get some pictures and post them this weekend