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Pedro Bonilla just posted a very good video on youtube concerning the IMS and the bearing options for replacements. Because I'm at work I can't paste the link in for the youtube video (youtube is blocked here) but search for it and you'll certainly find it.
It was a fascinating explanation of how oil finds its way into the hollow intermediate shaft chamber and how it becomes acidic over time and seeps into the bearing and washes away the grease causing premature bearing failure. He said they only see 1.5 out of 10 motors with old oil in the hollow part of the shaft, btw.
His final thought was the only way to battle the IMS bearing having its grease washed out of the sealed bearing would be the direct oil feed solution.
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