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Jeep scored cylinder---OT

L

ldj

Well-known Member
I have an old WWII army Jeep.
I was going to put new oil seal in with engine in. Looked up to see all cylinders and #4 has been scored by wrist pin. Question was had it been scored before and someone put together that way or is the pin loose and causing the damage now. I took head off and piston and rod out and wrist pin is loose now. Probably won't put over 1,000 miles a year on it. Should I sleeve it or just tighten the wrist pin and go with it that way? I really hate to take it all apart to sleeve without complete rebuilding it. The engine is in good shape and doesn't need rebuilding. Other than blow by on that cylinder I don't see what it will hurt to run it as is.
 
Old M38 or CJ2 type? Knurl inside of piston wrist pin hole and then insert pin back in - should need a bit of pressure and won"t float in piston anymore. Trying to remember if wrist pin is of right size hole to put on a teflon button- another way to prevent scratchs. lightly lap cylinder to remove score marks. RN
 
Easiest thing to do is hone the cylinder lightly and put it back together properly. If the marks aren't to bad it may run OK, just use a little oil. Other than oil usage it can't hurt anything so I'd try it before going to a lot of work. If the marks aren't too deep you may be able to remove them by just boring it if you decide to do that later on. Otherwise it would have to be sleeved. I sleeved one cylinder on my M38a1 military Jeep due to a crack and have put 8000 miles on it with no problems.
Good Luck,
Paul
 
It is a 1942 GPW
The scores are to deep to hone out I am leaning toward tightening that pin and go with it. It was running good and that spark plug wasn't getting oily. However I have noticed a little blow by from this draft tube. Those scores is probably where it is coming from. What about those plugs? where would I find them. That would be good insurance. Aircraft engines use a plug and the pin floats and if I remember correct so does a Maytag engine.
 
Eventually that cylinder may cut its rings in half.
Though it is a shame, to go with the repair when it is running well, if the jeep has the value to keep in the family, I would fix it. CJ3B owner. F head
with a International K series cab grafted on, and rack and pinion steering out of a 82 Tercell. JimN
 
So you have a GPW? It's a Ford Jeep. Everything on it is the same as the MB, or Willys, as you probably already know. Are most of the origional parts on it? It's kind of hard to find GPW's that haven't had a few MB parts put on them. There were several million MB's made but 'only' 250000 or so GPW's made, from what I understand.Jim
 
as long you have the rod out have it checker to see if it is bent if it is it will push the pin to one side making it score the wall
good luck .old art
 
Actually most everything is original on it except the engine. The engine is from a 1942 Willys car. Of course it is just like the engine made for the Jeeps by Willys and Ford except for casting and serial numbers.
 
I would sure do something with it if you want to keep the Jeep and use it. Because it isn't going to get any better or just stay the way it is now. It will get worse there is no denying that. Most people have no idea what goes on in an engine when the fuel air mixture ignites. There is tons of force put on that piston and it is forced to one side (this is called the thrust side of the piston) of the cylinder as it is being forced down during the power stroke.

I've seen this situation before and people have done just what you have done and it doesn't last.

You can take it and have just one sleeve put in that cylinder and not worry about the rest of them.
If it were mine I would have it sleeved and put new pistons in the rest of them and you have an almost new engine.
 
depending on how deep the score is it might be possable to bore it the minimum oversize and use a new piston and rings. Balance the pinton with a gram scale.
 
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