Engine Oil Pump – ACDelco (12644591)

Engine Oil Pump is a driven pump in the engine or transmission circuit. Wear shows up as reduced output long before the unit stops turning.

Replace the Engine Oil Pump when flow or pressure is below specification, when the drive coupling is worn, or when the unit is noisy under load. Check the inlet for restriction before replacement.

This Engine Oil Pump is listed as part 12644591 (Oil System). Where a number has been superseded, the current reference is the one that ships, so check any supersession note before ordering.

This is ACDELCO dealer-sourced stock rather than an equivalent, so the number on the Engine Oil Pump traces straight back to the manufacturer.