Vacuum Pump

A vacuum pump is mounted on the engine and provides vacuum for operating emission controls, transmission modulator (M40 only), cruise control and heater doors. The vacuum pump is either belt driven or gear driven.

The belt driven vacuum pump used on "G" and "P" models is bracket mounted to the right front of the engine. It has a pulley attached which is driven by the alternator belt. With the exception of the pulley, the vacuum pump is replaced as an assembly.

The gear driven pump, used on "R/V" models, is mounted at the top, rear of the engine. It is driven by a cam inside the drive assembly to which it mounts. The drive housing assembly has a drive gear on the lower end which meshes with the camshaft gear in the engine. The drive gear causes the cam in the drive housing to rotate.