Join Date: Apr 2012
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at our shop we've noticed quite a few 6.4's in which the pivot at the end of rocker arm would wear excessively. it seems like a common problem with them. on one, the pivot was completely worn off and the rocker arm was pounding directly into the valve bridge.
on another vehicle, the rocker arm blew apart.
keeping in mind that the material that wears off the pivot and, on advanced deterioration, the rocker arm itself, is getting into the engine. one of the possible causes could be the fuel dilution in the oil