I've seen that in engines I had no reason to believe had ever had Bars Leak in them.
I think it's a mixture of iron oxide, casting sand, and hard water deposits that settles in the bottom of the block. Apparently it is quite corrosive. I've seen the back side of freeze plugs eaten away on the bottom where they were in contact of it, still looked good on top.
It is good to get all of it out you can!
Ever use any of these? They are great where you can't get a swing with a hammer, permanent too!
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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