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 - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let’s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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