Service Information: Pump-Oil: Operation

WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Oil Pump Components

Courtesy of DAIMLERCHRYSLER CORP.

1 - CRESCENT

2 - OIL PUMP

3 - EXTERNAL GEAR

4 - INTERNAL GEAR

5 - INLET CHAMBER

6 - PRESSURE CHAMBER

When the engine is running, the oil is pumped through the inlet chamber (5) along the upper and lower side of the crescent (1) to the pressure chamber (6) of the housing. The meshing of the teeth prevents oil flowing from the delivery side to the intake side. An external gear (3) is eccentrically mounted in the pump housing. The external gear is driven by the internal gear (4) which is connected to the torque converter hub. See Fig 1.