engine number

[peterporsche]

Evening all I have a question I am hoping someone on here maybe able to help me with I am trying to find out the date of my engine but it doenst seem to have a serial number in the normal place the only number I can find is below where the oil pipe ends well just off to the left I hope that makes sence the Number is 638632.
Thanks all

[wesk]

That is the casting number. That block casting was used thru most of WWII and the very early CJ2 and CJ2A's in 1945. The serial location on that block was a small oval raised flat on the right side up high and forward under the oil filter bracket. Most of these castings had a very short flat (left to right) above the water pump. The later version of this casting used on the CJ2A had a larger flat above the water pump and moved the serial number there.


WWII 638632 casting serial number location


Here's an MB engine serial.


The later 638632 casting had a wider serial pad above the water pump just like this much later M38 block which were 641087 and 804380 castings.