Engine - Geroter Oil Pump Assembly

Number 85-6(Gasoline)-42 Date 7/85

Subject: GEROTER OIL PUMP ASSEMBLY

1985 GRAND AMS WITH 3.0L (VIN CODE L) V6 ENGINES

FIGURE 1 - CRANKSHAFT PULLEY AND DAMPENER ASSEMBLY:

FIGURE 2 - CRANKSHAFT PULLEY AND DAMPENER ASSEMBLY:

A revised geroter oil pump assembly went into production recently on the above engines. It incorporates a new internal pump gear, crankshaft sprocket and crankshaft pulley and dampener assembly. Figures 1 and 2 identify the differences.

The splines have been removed from the crankshaft sprocket and replaced by two "flats" one on each side of the gear (Items 5A and 5B). The aluminum seal, item #6 has been removed. As a result the length of the hub from front to rear on the crank pulley and dampener has been changed to .180 of an inch.

Installation of the wrong pulley and balancer assembly may cause improper drive belt alignment and premature belt failure.