If a little bit of stop leak doesn't work, I would be very wary of adding a lot of it. The thermosyphon cooling system depends on the cooling passages being open and flowing freely.
To fix it right, take the head off, disconnect the rod from the crank, push the sleeve out, inspect and clean all the sealing surfaces and replace the O-ring that is leaking. It is a little more work, but not so very much, and it would be fixed right when you are done.
If it was me, I would do all the sleeves O-rings while I was in there, and flush out the cooling gallery that surounds the sleeves, but that is just my way of doing things.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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