L-Head identification

I just picked up a new project this weekend: a '46 CJ2a. The body and frame tags both match but I couldn't find a tag on the motor to tell if the L-head is original. How can I tell? It has a Carter YS carb, is this original? I'll post pictures tomorrow but I'm just trying to get an idea of what exactly I have. I'm guessing it is because everything else is stock, even the wiring, but I thought it should have a Carter WO and not a YS. Thanks for the input

 

Steve, if it says Willy's on the head, it's prolly the factory installed unit. 8)

 

Is there no way to match the serial # to the motor? I know the motor is a L-Head but I was just curious if it was the motor that originally came in the jeep. The carb thing made me wonder because I thought the YS was used in the M38 and the WO was in the CJ

 

The 2A L-134 s/n is stamped on the boss above the water pump it’s a flat spot about ½ x 4”. The Military L-134 is about ½ x 2” across.

 

Ok guys, thanks for the help. I'll take pictures this morning and post them in the garage section later today. Am I correct about the carb? To be original it should have a WO?

 

Unless it was a column shift 2A it should have a casting number of 641087. Column shifts, and maybe some after, had 638632 as the casting number and these were chain drive. If it has this number it could have the serial number behind the oil filter or on the water pump boss. All those w/ 641087 had it on the water pump boss. They should have a CJ2A or J prefix unless a replacement block and then it would be 4LR
Fill us in.

 

Ok, got the number off the motor and it doesn't match the serial number found on the frame or the body. The body/frame # is 79246 and the motor # is 3543202. The casting on the block is 1/2" x 2" and the carb is definately a YS. Is it safe to say that this motor came out of a later model M38?

I posted pics to my Webshots page here: http://community.webshots.com/album/336745775zcfRNR


Anybody see anything else that stands out as not original, other than the tow bar?

 

Link doesn't work. Not owner.

 

It's M38 carb, MB/GPW or early 2A head as there are no ribs. That serial number can't be correct, too many numbers. Look just above the oilpan on the passenger side of the block. There is a 6 digit number. Were was the engine serial number located?
What is the 4 or 6 digit casting number on the head?

 

That was the number cast into the block above the water pump. I'll have to check above the oil pan tomorrow to see if I can find anything else. Where is the number cast into the head? It has the firing order and says something about the intake/exhaust along with "jeep".

So are you saying that the head (or motor) is from a pre-46 Jeep?

 

if its an early unit the distributor will have a reverse cut gear on it as well.. i don't have the book in front of me, but it will be opposite most of the published button rotations. i'm sure there's more little thingsthat i've forgotten but its been a while since i've torn into an l-head.

scratch that, the gear is on the oil pump, it is cut reverse fom most gear but it turns the same direction, don't know what i was thinking before...

 

For a 46 wouldnt it have three plates on the dash instead of one? If you want to part with the carb I maybe interested.
-Bill

 

Could it have been 3J43202 on the engine. There should be a casting number somewhere on the head.

 

It does have three plates on the dash. One for top speeds, one with the Willys logo, and one with the shift patterns. They're a little hard to read but they're all there. If I get rid of it I'll probably sell the whole thing, but if I decide to part it out I'll let you know

I'll have to look again at the water pump boss but I'm pretty sure that's what it said. I remember looking at it a few times because it seemed long to me. I've been known to be wrong in the past though

The Jeep is at my work so I won't be able to look until the morning. I'll take some close ups of the engine/head and see what I can come up with. Anything else that would help distinguish the motor?

I really appreciate all the help. It's great to have a resource like this, thanks guys