You are right. I had my M open to put new bearings in last winter and I THOUGHT I remembered at least two holes open ( one on each side ) to the inside just behind the differential bearing carrier opening. I guess not. There are holes in the belt drive area that are open to the inside which is why the two long bolts have copper washers on them . At least mine did when I took it off. I didn't put it back on so I didn't buy the " gasket " ( part # 29573 ) the parts book calls for so I don't know what they are made of. The gas tank makes a pretty good shield for them though. The other paths water can take is through the filler opening unless it's sealed with Teflon tape each time it's closed and the biggest culprit which has already been mentioned - the shifter. Seems like the rear frame has such a large volume of open space the expansion of the heated air has to go someplace so there's a way for it to get out and equalize the inside and outside pressures otherwise the seals would leak as pressure builds and vice-versa. I'm no rocket scientist but I know water gets into my rear frame and I have to drain it out once or twice a year. How it gets there is the million dollar question. ...Randy
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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