Posted by Mike Dau on October 28, 2011 at 16:17:04 from (173.25.38.117):
I'm in the process of tearing down the engine on my '37 F-20, and at this point it's just the block and crank that's left. (and a couple of valve tappets that there doesn't seem to be any way to get out of the block, but that's another matter.) I've got a service manual that specifies tolerances for the connecting rod bearings, but it doesn't give any info for allowed play in the main bearings. There's no longitudinal (front-to-rear) play in the crankshaft, and the rear bearing has no lateral play in it, but the front bearing does have some. My question is: How much is too much? I want to rebuild the engine properly, but at the same time, I don't want to go through a lot of extra work and expense replacing a front main bearing that's ok as-is.
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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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