Posted by BushogPapa on August 20, 2013 at 19:05:08 from (173.88.51.117):
In Reply to: JD 620 crankshaft seal posted by old fashioned farmer on August 19, 2013 at 19:03:59:
I can tell you from experience that you should be checking the Clearance on that Mail Bearing... Put a Dial-Indicator the crankshaft and lift on it.. Mine had .073" Clearance and didn't make any noise at all..the only problem seemed to be that the seal was letting engine oil into the transmission.. Had to replace that Main bearing AND Rod bearing..all because of the "Gasket" that is trapped between the engine crankcase and the bearing quill. That "Gasket" had swollen and blocked the oil flow to that side of the crankcase. If you do install a Bronze Main Bearing, have at least .005" bearing clearance..I used .004" and had a hard time breaking it in. Let me know what you find, but I am SURE this is your problem..
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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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