Engine Lubrication: Description and Operation

The engine lubrication system is of the force-feed type in which oil is supplied from the oil pump (6600) under full pressure to the following:
- crankshaft(6303)
- connecting rod bearings (6211)
- hydraulic valve tappets (6500)
- camshaft bearings (6261)

A controlled volume of oil through the valve tappets is supplied to:
- push rods (6565).
- rocker arms (6564).

All other moving parts are lubricated by gravity flow or splash.

The rotary gear-type oil pump:
- develops the oil pressure.
- is located in the engine front cover (6019).
- is rotated by the camshaft position sensor housing shaft through an oil pump intermediate shaft (6A618).

A full-flow oil bypass filter (6714) is externally mounted on the oil pump and filter body (6603). Normally all engine oil passes through the oil bypass filter element. However, if the oil bypass filter element should become restricted, a spring-loaded bypass valve will open which allows an uninterrupted flow of oil to the engine's moving parts.