Parts such as the Water Pump: Washer-plain,6mm, Gasket,pump Cover (mca), Pin,dowel,6.2x8x14, Shaft,impeller are included in the En450a5 454ltd 1989 Usa California Canada Water Pump parts fiche.
The Water Pump assembly is constructed from several parts from which the Cover-pump is the most expensive.
This WATER PUMP assembly utilises three Bolt-flanged-small(s) - the highest specified component.