The only way I know is to remove the transmission and visually inspect the seal and bearing flange.
A check of the oil filter and sump for metal debris is an indirect way to see if the bearing is starting to fail. Another way is to look at the camshaft deviations when the engine is warmed up. They should be absolutely rock steady and within +/- 6 degrees.
Last edited by thom4782; 03-02-2014 at 08:15 PM.
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