Engine Lubrication: Description and Operation

The gear-type oil pump is attached to the bottom side of the rear main bearing cap and is driven by the camshaft through an intermediate shaft. Oil flows through the pump outlet tube to the cooler located in the radiator. A bypass valve is incorporated into the system, which allows oil to bypass the cooler and continue to feed the engine should the cooler become clogged. From the cooler, the oil then flows through a cartridge type oil filter. A bypass valve is incorporated into the system to prevent oil starvation should the filter become clogged.
From the oil filter, oil then flows through the drilled galleries in the cylinder block. The rear crankshaft bearing is fed by a hole drilled from the rear main bearing bore to the main oil gallery. Oil is also pumped through the main gallery to a gallery which has been drilled the full length of the left side of the block. Oil from the left side gallery feeds the camshaft bearings and a gallery which runs the full length of the right side of the block. All other engine components are lubricated through these left and right main galleries.
Oil is supplied to lifters on the right bank from the right side main gallery, and to lifters on the left bank from the left side main gallery. The lifters contain disc valves which meter oil to the hollow pushrods and provide valve train lubrication. Holes drilled from the camshaft bearing bores to the crankshaft bearing bores supply oil to main bearings 1---4. Oil flows onto the crankshaft bearings providing lubrication for the crankshaft to rotate freely in its bearings, and cross drilling provides lubrication to the crankpins. As the crankshaft rotates, oil slings off the crankpins to lubricate cylinder walls, pistons and piston pins, and the piston rings.