Engine Engine locked up

[mystikdan]

Hi all,

I recently inherited a flat fender jeep with an engine that will not spin. My father-in-law recently had a severe stroke and has a long road of recovery ahead of him. He's no-verbal at this point, but really perks up when I talk to him about his jeep projects, so I think it is worthwhile to do some work when I can and keep him updated on the progress. His goal this summer was to get his 2 grandsons, my boys, in his jeep that he's had for 40 years but has been parked for 20. I'm just continuing his mission.

First off, what engine is this? How do I find out which engine/manufacturer this is?



Over the years when I told him to get the thing running, he always said that it only needed a battery and it should run, but last year he discovered that the engine wouldn't spin. He has a 3ft breaker bar on the crank pulley, and nothing is moving. Again, he drove it into the garage 20 years ago and parked it.

On inspection yesterday, he had the spark plugs out and a can of some lube on the fender. It didn't seem like the right kind of thing to break it loose. I dumped all of the Mystery Oil I could find in the garage, but I wish I had put more in. I will be back there next weekend.

Am I going to hurt anything if I start trying to break it loose next weekend after a week of soaking? Should I dump more in and wait another week? Should I drop the oil pan and inspect/lube anything before trying to spin it? I don't want to overthink this process, but I don't want to miss anything obvious.

I would be awesome to get this thing puttering around the yard in the next few months, and then I can start looking at finishing his CJ8 project!

 

[Belizean]

Very nice. Looks like it is in very good condition.

 

[TSB8C]

Not going to hurt anything putting Mystery Oil or other lubricant into the cylinders and leave them to soak for days or even a week. You can also put the breaker bar on the crank and leave a large weight hanging while it soaks to exert constant pressure on it. Worst case, pull the cylinder head and use a wooden block and large hammer to try and force the pistons down one at a time.

 

[Manic Mechanic]

That's an MB from WW2. It has the 134 L134 "Go Devil" in it

I prefer kroil for freeing up the cylinders

 

[Posi]

I freed a 134 using a 50/50 mix of diesel and ATF. Let it soak for four or five days topping it off every day. Then try rocking it "easy" in second gear. It should free up, if it doesn't continue soaking for a couple more days. Let us know how you make out. I hope this helps.

 

[mystikdan]

I picked up a battery and kroil today. I won't get over there till this weekend. Hopefully there's a resurrection on Easter Sunday

 

[Manic Mechanic]

I picked up a battery and kroil today. I won't get over there till this weekend. Hopefully there's a resurrection on Easter Sunday

Don't be afraid to use a lot. Once it's freed up and you get it running don't be alarmed by the amount of smoke. Kroil or anything else you put in the cylinder will burn off and it smoke like the Dickens.

On a separate note be sure to double check the electrical system they were 6 volt not 12 like modern day. If you try to use a new battery or a jump box you could damage things

 

[mystikdan]

What about the fuel system? Is this a cam-driven fuel pump? How likely is it that I can get away with some sea foam and new gas? Is there such a thing as a temporary 1 gal plastic tank or something?

8V battery was in there before, I replaced it with the same

 

[Manic Mechanic]

Check out G503 they are an amazing resource

 

[Jeep Soup]

From your picture, some time in it's Past, someone put a 8 Volt Battery in. (It has 4 caps)
Now, if it was done correctly, they turned the Voltage Regulator UP!
The Dash only has a Amp Meter.
When you get it running, check the Voltage slightly above Idle.
Charging it will be 9-10 volts.
ALSO, It is a Negative Ground System!! Which was unusual for 6 volt systems back then.
Good Luck, it should Break Free.
Unless Water was allowed to freely enter the carburetor, it should only be some surface rust. Check for other things that could be holding the Drive Line up. Have some one step on the clutch while you try to turn the engine over.

 

[Manic Mechanic]

standard World War II-era vehicles, including the Willys MB and Ford GPW (collectively known as G-503 Jeeps), were designed with a 6-volt positive ground electrical system.
Positive Ground System: In these vehicles, the positive battery terminal is connected to the frame and engine block, while the negative terminal supplies power to the starter and electrical components.
Context: It was common for American vehicles of that era to use 6-volt positive ground systems.
Conversion: Many enthusiasts today convert these vehicles to 12-volt negative ground for better reliability and ease of installing modern accessories, but they were manufactured as positive ground.

 

[Jeep Soup]

Here is a WW2 Jeep wiring harness and diagram.

Negative Ground. It was a Unique thing to the Jeep and GPW

 

[Manic Mechanic]

Here is a WW2 Jeep wiring harness and diagram.

Negative Ground. It was a Unique thing to the Jeep and GPWView attachment 106979

Actually a lot of older cars used it. I found out the hard way when I first started working on old cars. It was also common with the British cars like triumph. The one that got me was a 1926 star