Join Date: Jun 2002
Location: The Deep South of Vermont
This drive came to me as a working drive for a preemptive rebuild.
The tapered roller bearing was loose on it shaft and came partially off by gravity as I removed the crownwheel assembly from the housing.
Further analysis reveals that the tapered roller bearing inner race has been spinning on it shaft and on the shim that is located under the tapered roller bearing. This shim is used to set the gear lash between the crown and pinion gears.
Pics show the wear of the shim and the scoring on the inner race of the tapered bearing. Clearly this FD was on its way to a failure of the tapered roller bearing. When this type of failure occurs the crowngear assembly is toast, and the drive is basically trashed because the cost of a crowngear assembly/input pinion gear set is pretty expensive and required a complete rebuild of the drive. In this case the tapered roller bearing is stable on the shaft, its just that the inner race spins on it seat. I'll rebuild with a Loctite product designed for this type of application after I reshim the tapered roller bearing.
Last edited by CharlieVT; Apr 11th, 2011 at 7:03 pm.
Reason: drive history updated/corrected