Vacuum Pump (5.0L NA)

On 5.0L (NA) petrol models the vacuum pump supplements the main vacuum supply from the engine manifold.

The vacuum pump is a radial vane pump which is attached to the end of the auxiliary drive camshaft and driven by crankshaft via the auxiliary drive chain. The vacuum pipe from the brake booster connects to an elbow on the rim of the vacuum pump.

The vacuum pump is lubricated and cooled by engine oil supplied from the gallery in the block, through the auxiliary shaft, to the oil pick up tube (see small hole in green shaft in picture above!). The oil return is through twin outlet ports in the front face of the pump into a drain cavity in the sump. Air extracted from the brake booster is vented into the drain cavity along with the returning engine oil.