The coolant in the oil points to another problem other than rain through the pipe. Must be a crack somewhere, or bad head gasket. Strange that a machine shop would rebuild the head and not even look at the bottom end, at least check the oil for coolant/water. Then set it outside with no rain cap. They should've known better.
That said, I just got my first Farmall a few years ago, and to me the fun part is working on it. You may find the same. 67 is not very old, so quit saying that!
If you plan on working it any at all, you probably need to do as others have said in this, and your next post, and start taking it apart. It's not hard, they were engineered to be easily rebuilt by farmers with mostly basic tools. If you're not going to work it and just put around with it, then you may be ok trying to get it going as is, but that coolant leak, if it continues, and it will, will wear your bearings pretty quick, rings, etc.
If you don't have one, get a manual. Easy to do, they have them here on this site, or Binder Books site). If you have some experience working on motors you can start without one, but you will find having one a great help.
Pull the valve cover, remove rocker arm, then head, see what you've got. Then pull the oil pan and see what the bottom looks like. All that won't take an hour or so, and at least then you'll be able to see if a cylinder o-ring is leaking, or other likely culprits, cracked sleeve, block, freeze plug, etc.
A complete engine rebuild kit is only around $350-$450. Click link below.
I am by far not the most knowledgeable person here, but I do know what it's like to be a rookie tractor owner looking at having to rebuild a motor. Others will gladly lend assistance too.
Start in on her and let us know how you're progressing.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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