by hall_philip » Tue Jan 06, 2015 2:50 pm
the bearings are not sealed, they are an open bath bearing. so if you remove the camshaft and the bearing either doesn't spin at all or spins roughly, I have seen the inner bearing race lock up and the cam spin on the ID of the bearing. usually something like this happens from oil contamination or neglect, being as that's where this bearing gets it lubrication from, also heat.