Engine lubrication system
The stamped steel oil pan, mounted underneath the crankcase, serves as a reservoir for engine oil. An oil pump directs oil from the pan through a mesh filter and an intake pipe to a full-flow oil filter.
The filtered oil is directed in a flow from the center of the filter element and through a small channel on the right side enters the oil pressure sensor and the main line (on the left side of the crankcase) through a cross channel.
Four channels supply the main line to the four main bearings, the camshaft bearings, in turn, also communicate with the main bearings. The connecting rod bearings are supplied with oil through diagonal channels from the nearest main bearings of the crankshaft.
When the crankshaft rotates, oil flows through the holes in the bearings of the lower connecting rod heads, thereby providing splash lubrication to the piston pins and the sides of the cylinders that receive lateral pressure. The timing gears are also splash lubricated through lubrication channels.
From the journal of the third crankshaft bearing, oil flows intermittently under pressure through a channel in the cylinder block and cylinder head to the valve rocker shafts. The oil then returns to the engine sump through large channels in the cylinder block and cylinder head.