1953 cub bearing inserts

I am going to put piston rings in the cub, with the
engine not removed from the tractor [in frame].

When I got the pistons out, I had the bad idea of
doing the bearing inserts while the engine was torn
down.

The local machine shop got standard size Federal Mogul
bearings to put in.

I've done many tractor engines in frame with replacing
inserts.
Anyways, rolled the new main insert halfs in & put the
caps on just snug. Can't turn the crank.

Put the old inserts back in & snugged up the cap bolts---
still can't turn the crank.

Any words of wisdom on what I have done wrong?

Thanks for any help.
Jim
 
All it takes is a sliver of material getting between the insert and block or cap and it will lock up. Make sure (I know you Know) that the lock tabs are on the same side. Jim
 
You sure that the new bearings are std? Reason I ask is I odered a set of .010 main bearings one time, and while plastigauging them, found they had way too much clearance. Measured the old bearings, measured the new bearings. The set of main bearings was mismarked as .010, but was actually standard. Glad I caught it.
 
remove them, then as u install each one with the correct clearance, rock the crank till the no turn situation comes.
some thing not right if it does the same with the old brgs.
ya as jim says it may have got a sliver in there when rolling them in.
how are you installing the upper brgs.? using a cotter pin?
i would do one at a time , that means torquing to spec. see if it turns, if so loosen bolts again and go to next one. and repeat. then once they are all in do a final torque.
 
They have a little notch that sticks out and goes ina matching cutout in block and cpa, make sure they are turned right. Center bearing is also a thrust bearing, make sure it is in the center.
 

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