Ford engine type?

Lucas Paull · 14-02-2022, 08:10 AM

Hi all I am restoring a 1942 Ford gwp jeep and the engine isn’t original and I wanted to know what type of engine I have in it
The engine number is JGG 31 YF
Can anyone let me know what type of engine I have thanks in advance

slowsnake · 14-02-2022, 08:50 AM

Give this a try below.

http://www.rensjeep.com/MBvsGPW.html

Regards Billy.

Lucas Paull · 14-02-2022, 09:07 AM

Thanks definitely not an original engine maybe XV? Not sure extra G in the engine number?

Vesper Martini · 14-02-2022, 10:11 AM

if its been swapped maybe a picture would help? do you know when it would have been swapped?
from the below it looks like Ford Pinto engines were a popular swap
https://www.novak-adapt.com/knowledg...es/ford-pinto/

jaydee · 14-02-2022, 11:14 AM

Wow, now there's something different, would love some photo's.
How about a build thread in the projects section.
Love those WW2 Jeeps.

Crazy Dazz · 14-02-2022, 09:50 PM

Quote:

Originally Posted by Lucas Paull

Hi all I am restoring a 1942 Ford gwp jeep and the engine isn’t original and I wanted to know what type of engine I have in it
The engine number is JGG 31 YF
Can anyone let me know what type of engine I have thanks in advance

IF it's an original 1942 GPW, then yes that's not the original engine.
I've heard old tales that post ww2, surplus jeeps were assembled in Australia with local engines???

But either way, I've definitely heard of Jeeps, still ins use, being re-engined. Presumably that would have been way back when, 60s, maybe 70's??
It's then possible, that such a vehicle was "restored" later, and not having the original motor, was re-engined again???

We'd need the full engine number for a better attempt to identify it. During the period in question, Ford's Engine numbers actually reflected the VIN number of the car, so they represent the original car it was fitted to.

So yours is from a Falcon.
JG means the car was built at Broadmeadows.
31 means it was a Falcon 500 Wagon

YF should be the build date, but I've found decoding those to be quite problematic
FY would make it 1966.
YF, I don't know

Are there any other identifiers on the engine?

Vesper Martini · 15-02-2022, 08:59 AM

Yes JG reflects Broadmeadows. I was looking down the 4 cylinder path with the information given, but if it has a 6 or even a V8 from a Falcon that's another story.

Lucas Paull · 15-02-2022, 09:05 AM

Yes the JG is Broadmeadows but has another G then 31 YP
Would think it would be 6 cylinder ford falcon 500?
Extra G and the YP is a bit off
Bought a replacement clutch from shop and they matched it to a XW?

Vesper Martini · 15-02-2022, 01:19 PM

Do you have pics you can post?

Is it possible you have an Australian Combat Jeep?

http://mapleleafup.net/forums/showthread.php?t=16761
during the '50s and '60s Willys Motors had an assembly plant in Brisbane, Queensland - and as part of some local input agreement, there was some sort of requirement for Australian content - and a deal was struck with Ford Australia, fitting CJ5s with six-cylinder Ford Falcon engines (initially 144 ci OHV). These were linked up with specific bell-housings to the standard three-speed CJ5 jeep gearbox and drive train. I understand these jeeps arrived as CKD kits and were converted to RHD upon assembly (from various accounts, the build quality wasn't exactly marvellous).
The result was known as the Combat 6 - with its own special Combat 6 decals on the side of the body - and contemporary print advertising played heavily on the Willys jeep's wartime record. Over about a ten-year stretch, more than 600 Combat 6 jeeps were built in Australia.

Lucas Paull · 15-02-2022, 06:31 PM

Hi all here are some pictures of the engine in question = ford 221? Or any other suggestions
Left hand drive still no Vin or Aussie compliance plate thanks

Crazy Dazz · 16-02-2022, 01:03 AM

Quote:

Originally Posted by Lucas Paull

Hi all here are some pictures of the engine in question = ford 221?

It's a bit of a mystery.
Definitely not a 221 or similar, as it is a crossflow head. That puts it late 70's at the earliest.
It's intriguing, because "YP" actually decodes to 1981. But that would mean it had an alloy head

jpd80 · 16-02-2022, 06:55 PM

Quote:

Originally Posted by Crazy Dazz

It's a bit of a mystery.
Definitely not a 221 or similar, as it is a crossflow head. That puts it late 70's at the earliest.
It's intriguing, because "YP" actually decodes to 1981. But that would mean it had an alloy head

Ok so the short block is from an 81 XD alloy head and topped with an early iron head set up.
I remember people doing this in the late 80s to add an ally head to the early cross flows
but needing the manifolds with the head because the bolt pattern is different to the iron heads.

Crazy Dazz · 16-02-2022, 08:10 PM

Quote:

Originally Posted by jpd80

Ok so the short block is from an 81 XD alloy head and topped with an early iron head set up.

IF (and its a big if) it legit came from a 1981 XD Falcon, then this is a possibility.
Because those first series of alloy heads were known to be water soluble.

Vesper Martini · 16-02-2022, 10:21 AM

Quote:

Originally Posted by Lucas Paull

Hi all here are some pictures of the engine in question = ford 221? Or any other suggestions
Left hand drive still no Vin or Aussie compliance plate thanks

couldn't make out that licence plate, has it been registered in Australia?

wheels and tyres certainly are not 1940s

where did you find this - great Project.

personally Id dump the heavy 6 cylinder and try and restore it to original they are worth heaps that way.
or even fit a more suitable light weight 4 cylinder

foxtrot3 · 15-02-2022, 07:12 PM

Hi. Looks like a motor from an XC or XD. 200 or 250. Cheers MD

Franco Cozzo · 16-02-2022, 11:08 AM

Ecoboost from the red headed stepchild Falcon I reckon.

0-cemetary in sub 5 seconds in a Willys Jeep!

Bill M · 16-02-2022, 06:57 PM

Looks like Victorian club reg so I assume you are in Vic. There is a military vehicle specialist in Somerville Victoria who does good work if you wish to get it to an original engine configuration. I have a 1944 GPW project that I am slowly getting together.
cheers
Bill

Lucas Paull · 16-02-2022, 07:46 PM

Quote:

Originally Posted by jpd80

Ok so the short block is from an 81 XD alloy head and topped with an early iron head set up.
I remember people doing this in the late 80s to add an ally head to the early cross flows
but needing the manifolds with the head because the bolt pattern is different to the iron heads.

I need a new sump so I will get one for an 81 XD? I have the rest Thanks

Crazy Dazz · 16-02-2022, 08:21 PM

Quote:

Originally Posted by Lucas Paull

I need a new sump so I will get one for an 81 XD?

Welcome to the wonderous world of Ford.
They used the same basic bottom end from early 70's through to late 80's (and into early 90's if you count the XF utes)
So anything from a "250" or "4.1" will fit. (even a "3.3" but I digress)
Shape of sump may have varied a little, but the more important thing is to get one that fits your Jeep, especially considering clearance for the front diff.

Quote:

Originally Posted by Lucas Paull

I have the rest

Can you post a picture of the rocker cover?

Lucas Paull · 16-02-2022, 08:32 PM

Rocker cover picture attached

Lucas Paull · 16-02-2022, 08:35 PM

I took the old clutch to Victorian brake and clutch in Pakenham and he matched it to a XW

Crazy Dazz · 16-02-2022, 10:42 PM

Quote:

Originally Posted by Lucas Paull

Rocker cover picture attached

Yep, that's definitely a crossflow.

Keep in mind that whilst it is most likely a 250cc "4.1", it could also be a 200cc "3.3" (basically same engine with a shorter stroke and smaller heads)
They were less common, and became increasingly so.

jpd80 · 16-02-2022, 08:22 PM

Quote:

Originally Posted by Lucas Paull

I need a new sump so I will get one for an 81 XD? I have the rest Thanks

Not the same.
Some people would buy the alloy head and manifold off a wreck and put on their own car.
The early alloy heads were known to rot out and some replaced with an early iron head.
Both situation occurred quite often.

Tassie f100 · 16-02-2022, 09:16 PM

Quote:

Originally Posted by Lucas Paull

I need a new sump so I will get one for an 81 XD? I have the rest Thanks

Depends on whether you have to fit it around the front diff.If the Falcon won’t work maybe look at 6 cyl Cortina which has 2 smaller pans,If you use Cortina you will need the pickup too.Think the later 70,s early 80,s F trucks were the same as Cortina

Vesper Martini · 17-02-2022, 09:31 AM

Quote:

Originally Posted by Lucas Paull

I need a new sump so I will get one for an 81 XD? I have the rest Thanks

Are you sure you want to go down the path of restoring the Falcon engine? if you need a new sump I'm assuming it wasn't fitted properly in the first place?

If it were me I would consider Bill M's suggestion above

Crazy Dazz · 16-02-2022, 08:06 PM

I recommend contacting Ford Australia, and asking them for details of that "VIN"
foacust1@ford.com

Can't say I've spent a lot of time examining engine numbers on 1980's 250s, but that one looks like it was hand-stamped by a blind one-armed Chimpanzee.
That extra G is also very puzzling.

I've heard various tales, of "blank" blocks being ordered as replacements direct from Ford, and then hand-stamped to match the existing VIN.

But if I had to guess, and this is pure spit-balling, I'd speculate that this engine was bought direct from Ford (ie a "crate engine").
Presumably it would have been in 1981, explaining the date code,
but may in fact have been NOS, explaining the iron head.
Since it wasn't fitted to a vehicle it would require a unique engine number, explaining the hand-stamping, and possibly even the double G?