WOW.. WTF?!! Yeah can't say I've seen or heard of bearing failure without leakage.. that is what happened to the water pump on my 98 XJ.. was driving down the highway, belt popped off.. was like WTF?!! so pulled over cut the engine off... had the wife come pick me up and take me to the auto parts store to get a new belt, since the old one was thrashed.. was fighting to get it on, went under the engine to get it over the harmonic balancer correctly, and got dripped on... and was like WTF?!! Pulled the belt back off and touched the water pump pulley, and all hell broke loose...