3A-18 - ENGINES 90-823225--1 1096
Some of the oil, after leaving the oil cooler and/or fil-
ter, is routed to the No. 5 crankshaft main bearing.
The remainder of the oil is routed to the main oil gal-
lery, which is located directly above the camshaft and
runs the entire length of the block. From the main oil
gallery, the oil is routed through individual oil pas-
sages to an annular groove in each camshaft bearing
bore. Some of the oil is then used to lubricate cam-
shaft bearings. The remainder of the oil is routed to
the valve lifter oil galleries and No. 1, 2, 3, and 4
crankshaft main bearings by means of individual oil
passages which intersect with the annular grooves.
The camshaft bearings have holes which align with
the oil passages or annular grooves in the block and
allow oil to flow in-between the bearings and the cam-
shaft journals. The oil that is forced out the front end
of the No. 1 camshaft bearing drains down onto the
camshaft drive and keeps it lubricated.
The oil which reaches the crankshaft main bearings
is forced through a hole in the upper half of each
bearing and flows in-between the bearings and the
crankshaft journals. Some of the oil is then routed to
the connecting rod bearings through grooves in the
upper half of the crankshaft main bearings and oil
passages in the crankshaft. Oil which is forced out
the ends of the connecting rod bearings and crank-
shaft main bearings is splashed onto the camshaft,
cylinder walls, pistons and piston pins, keeping them
lubricated. Oil which is forced out the front end of the
No. 1 crankshaft main bearing also assists in lubricat-
ing the camshaft drive. A baffle plate, mounted on the
bottom of the main bearings or in the oil pan, prevents
oil thrown from the crankshaft and connecting rods
from aerating the oil in the oil pan.
Oil which reaches the valve lifter oil galleries is forced
into each hydraulic valve lifter through holes in the
side of the lifter. From here, the oil is forced through
the metering valve in each of the lifters (which con-
trols the volume of oil flow) and then up through the
push rods to the rocker arms. A hole in each rocker
arm push rod seat allows the oil to pass through the
rocker arm and lubricate the valve train bearing sur-
faces. After lubricating the valve train, oil drains back
to the oil pan through oil return holes in the cylinder
head and block.
The distributor shaft and gear also is lubricated by the
oil flowing through the right valve lifter oil gallery. The
fuel pump push rod is lubricated by oil thrown off from
the camshaft eccentric.
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