jdemaris said: (quoted from post at 20:36:41 01/06/10) Yeah, this sounds like a stupid question, and I've had plenty of experience rebuilding engines.
Here's my problem. I've got a Ferguson TO35 engine torn apart and am trying to do an "in-frame" motor job. This all began because a sleeve was leaking coolant into the oil pan.
Engine is the Continental Z134 gas. So, I pulled the pistons and rods out and the rod bearings are all marked .020. So, that's an easy one - .020" undersize bearings. But, the mains have no such numbers. Just FM2227 SB. So, I assume FM is for Federal Mogul. I can't find a listing for that number in any database. I had originally thought that maybe the "SB" stood for standard bearing?" But, now, I'm not sure. Bearings looked good and I was just going to reuse them - so it didn't matter. But, just checked and they've got .0035" clearance (too much). So now I want new ones and can't figure if they're standard or some undersize that is NOT stamped on the bearing. I can't get a mike onto the crank journal while it's still in the tractor. I did attempt a crude measurement with calipers and tape measure and with this very poor measurement - the crank journal seems to be around 1/32" smaller then standard. That could easily be .020" or .030" under.
So, at this point, I have no idea what bearings go get. Anybody ever come across an undersize main bearing that was not marked undersize?
Why is .0035 clearance too much? Sounds about right to me.
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