FARMALL 460 Crankshaft Main Thrust Bearing

JC3 · Feb 2, 2014

I ordered main crank shaft and rod bearings for my 460 here. The number 3 main crankshaft bearing has a wider side flange than the one I took out and I am not able to get the new bearing to slide in around the crank. The number 1,2 and four go in fine. I checked my clearance with plastigage on the new bearings at .oo2". The bearings I took out are standard size so that"s what I ordered back. I did see in the I&T manual that apparently they changed the thrust bearing surface from 3 3/4" to 4"on later models but the diameter on the new bearing and the old bearing are the same. The only thing I see different is the side flange. My question is, why does the thrust bearing not fit? Thank You.

ejr-IA · Feb 2, 2014

In the clevite bearing book they show two sizes MP 494p 33/4 and MS 683P 4'' must be the side clearance thickness.

Owen Aaland · Feb 2, 2014

The size being refers to is the outer diameter of the flange.

The crankshaft needs to be in the correct location to get the bearing to roll into place. You only have a few thousands of an inch clearance there. You will need to move the shaft forward or back to get it in the correct place.

The C-221 engines in the 460 used the 3 3/4" flange bearing but I have always been able to used the wider flange one when overhauling them. You may want to check for sure that your block has been machined enough to accept the wider flange. I think all the blocks were machined to be able to use the wider bearing but it doesn't hurt to check. The 560 used the same block and they came with the wider bearing.

JC3 · Feb 2, 2014

I moved the crank back and forth with a prybar but still nothing. I will pick up a different bearing with the 3 3/4" flange. Sounds like that should do the trick. Thanks for the help!

FARMALL 460 Crankshaft Main Thrust Bearing

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Owen Aaland

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