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 - Haying Before Tractors - by Owen Clark. Hi guys! At age 8 (1927, am now 79) I was learning how to drive a stacker team on the old homemade A-frame wooden stacker, on three of my uncles` dairy farms in Star Valley Wyoming (south of Jackson Hole, on the Wyoming-Idaho border). There was one steam tractor in the Valley, owned by an entrepeneur who used it to run his grain threshing machine, that he hauled from farm to farm for the fall harvest. We used teams of horses not only on the stacker, but on the buckrake to buck the dried
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