A bit of a followup: To make a long, long story short, the transmission case has always had a tiny crack on the side where a broken moving part smashed into it from the inside many years ago. That crack had never leaked -- until a few months ago when I ran the tractor for several hours in very cold weather. Apparently the thermal stress of the rapid warmup opened up the crack and it started leaking again.
I called a mobile welder and asked if he could repair the crack. He explained in detailed technical terms why the weld probably would not hold. The only way to get it right would be disassemble the entire transmission to isolate the cracked side. Instead, he recommend that I clean out the crack and try some steel epoxy.
The first thing I did was to take a heavy hammer and hit the protruding side of the crack (it was only about a millimeter out from the rest of the case). I was able to push it back so far into place that the leak was reduced to about a quarter of its original rate.
After letting the yellow oil drain for a day, I put a hair dryer into the fill hole and let it run for several hours. The transmission casing closest to the hair dryer got pretty hot -- well over 100ºF.
So while I was heating the inside of the transmission, I scrubbed the area of the crack down with a fine wire brush and acetone, working really hard to get the bristles deep inside the crack.
Next I let the metal cool to about 90ºF and then applied the epoxy. The warm metal softened the epoxy so that it went readily into the crack. Then I gave it 24 hours to set.
This morning, I filled the transmission with 90W oil and ran the tractor for about half an hour. I let it cool for an hour and then checked it. The epoxy has held -- so far. But when I checked the new oil, it was yellow. Sheesh, NOTHING will get that water out of that transmission!
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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