Re: M- Main Bearing Questions

Posted by Andy Martin - Need to hear from Farmall engine rebuilders on September 02, 2001 at 06:59:37 from (63.27.16.12):

In Reply to: M- Main Bearing Questions posted by Joe on September 01, 2001 at 20:10:33:

Maybe we'll hear from some experts on engine rebuilding, but I wouldn't replace a 0.005 clearance bearing on an M unless I needed the practice. If you have the engine upside down and dry, that represents 0.0025 running clearance (crank centered in bearing) and the specification for M is 0.002 to 0.003. If the engine is in the tractor, it is hard to get an accurate plastigage reading on main bearings because the crank will sag a little, and you are only measuring a little. If the bearings look good, they probably are, no matter how old they are. I am convinced some of my M's have the factory bearings. You just about can't mic the main journals with the crank in, either, to know whether to buy undersize bearings. Main bearing failures are not real common on M's, in my experience. But I only work on my own tractors, however I do farm full time with them so they are worked extended periods under load.

You can put a piece of lead shot on each end of the plastigage to try to lift the crank up while you are measuring the bearing, but I'm really not sure if that still gives you a good reading.

Now let's hear from some real experienced Farmall rebuilders on replacing M manis in the tractor.

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