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I took out a bearing that was tight, it felt and looked perfect, the seal looked good. I seriously thought about leaving it in it felt so good. And that was with the IMS shaft out of the engine in my hand, so I had a pretty good look at it. I took the bearing out and pulled the seal. The only lube in it was stale motor oil. How long would that "good" bearing last? That's anyone's guess. The only clear fact is that the lubrication was compromised. I wish I'd have said it first, but I'll repeat it, the IMS bearing is in the same league as timing belts. They have to be replaced, or the valves meet the pistons.
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