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When the seal fails, and oil washes out the grease, the oil remains trapped and is beaten to death by the bearing, after which it offers no cooling or lubrication; the bearing then fails. Remove the rear seal, fresh oil is nearly continuously splash fed into the bearing, providing lubrication and cooling.
One of the common features of a nearly dead IMS is oil inside the seals that smells horrifically because it has long since died.
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Last edited by JFP in PA; 02-13-2013 at 11:45 AM.
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