My Willys 3A and 3B Community

3A, 3B, DJ Technical Knowledge Base => "Original"-- Technical Questions, Answers, Observations => Topic started by: gpwillys on April 04, 2011, 01:37:00 PM

Title: GPW in 1950 Willys
Post by: gpwillys on April 04, 2011, 01:37:00 PM: I was trying to find the id number on my Willys engine and came up with GPW-6015. Can someone please tell me what I've got here. So far it looks like the old Ford engine stuck in a newer body/frame. Thanks
Title: Re: GPW in 1950 Willys
Post by: F Bill on April 04, 2011, 04:26:53 PM: That is a casting number for the engine for Fords... Do you have any pictures of your engine you could share with us? Was the number on the head or the block?

If it is actually a WWII GPW block it will have a serial number up near the head surface on the passenger side of the block in a machined oval pad. It whould be GPWxxxx with the x being an actual stamped serial number that corresponds to the jeep it was originally in. GPWs were orignally a matching numbers vehicle, with engine, frame, and data plate numbers all matching,, unlike WIllys wherre the engine number was not a matching number to the frame. If you have the stock oil filter you may have a hard time seeing the serial number location

It is also possible you may have a GPW head on a willys block. Willys used the same serial number location on the WWII blocks and a pad behind the water pump on the later jeeps.

The early engine has a chain drive camshaft instead of the later and more reliable gear drive cam.
Title: Re: GPW in 1950 Willys
Post by: athawk11 on April 04, 2011, 04:38:50 PM: I have the same issue. ï¿½1949 CJ3A with a Feb 1945 GPW-6015 engine. ï¿½The serial#s have been ground off at the water pump boss and behind the oil filter housing. It was common to grind off the original serial #s prior to installing of surpluss engines.

With a little research, the additional number that is cast into the block (I think it's on the other side from the GPW-6015) will tell you the manufacture date of your GPW. ï¿½I honestly can't remember where I found this info.

I have learned that it is not uncommon to find these GPW engines in CJs. ï¿½After WWII, there were many surplus engines available, thus they were shelved and used years later in our CJ3s.

I was a bit disappointed when I found my engine didn't match my Willys, but heck, the thing runs great. A 65 year old engine without a single leak. ï¿½Now, if I could say that about the rest of the drive train, I would have something. ï¿½It leaks at the oil pan, the transmission, the transfer case, the wheels and yokes. ï¿½I don't even know where to begin. ï¿½

Tim