Water Pump: Description and Operation

The water pump is installed between the two cylinder banks, on the front face of the cylinder block.

The pump consists of a housing containing a shaft, with a shrouded plastic impeller on one end and an accessory drive pulley on the other.

A pair of roller bearings support the shaft in the housing. A seal behind the impeller prevents coolant from contaminating the bearings. Should the seal fail, coolant escapes from a witness hole in the housing indicating that immediate action is required.

An "O"-ring and an aluminum-alloy gasket seal the outlet ports in the cylinder banks.