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 - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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