Scotty: The two holes closest the axle(one each side of axle) on all these final drives have a very thin bottom. Probably less than 1/4" thick. It is very easy to thread in too long bolt and break the bottom out of the hole. When Larry had the pans off, he could have seen this as a break in the casting. Usually they break enough so 5/8 has an 1-1/2" diameter on the inside wall. Doesn't really weaken the final drive, my 130 has been that way since 1961. You do have to keep a bolt in that hole so it won't leak either way.
I make a practice of keeping well lubricated bolts in all those holes whether I'm using them or not. It keeps the threads clean should you ever wish to use them.
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Today's Featured Article - Product Review: Electronic Ignition - by Staff. Oil, for example has come a long way in the last 50 years and I don't use anything but the latest API grade available. I've heard the arguments for non-detergent oils but would never trade it for today's formulations. Paint is another, the modern acrylic enamels are great for resistance to grease and fuel stains, retaining their shine and they last forever; unlike enamels and lacquers . Still another is the alternator. No doubt using the original generator keeps the tractor pure, but for thos
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