Engine Lubrication System

Oil Pump

The engine lubrication system is of the force-feed type in which oil is supplied under full pressure to the:

• Crankshaft (6303) and main bearings.
• Connecting rod bearings.
• Hydraulic valve tappets (6500) .
• Camshaft bearings.

From the valve tappets :

• A controlled volume of oil is supplied to the rocker arms (6564) through the hollow push rods (6565) .
• All other moving parts are lubricated by gravity flow or splash.
• The rotary gear-type oil pump (6600) , which develops the oil pressure, is located in the oil pan (6675) .
• The pump-driven gear is rotated by the distributor shaft through an oil pump intermediate shaft (6A618) .

A full-flow oil bypass filter (6714) is externally mounted on the cylinder block (6010) and all engine oil normally passes through the oil bypass filter element. However, if the oil bypass filter element should become restricted, a spring-loaded bypass valve will open, allowing an uninterrupted flow of oil to the engine's moving parts.

Oil Pan

NOTE: When changing engine oil, both oil pan drain plugs (6730) must be removed to thoroughly drain the crankcase. One oil pan drain plug is located on the front of the oil pan and the other oil pan drain plug is located on the LH bottom side of the oil pan . Failing to remove both oil pan drain plugs when changing the engine oil can lead to an incorrect oil level reading after filling the crankcase with the specified amount of engine oil.