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 - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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