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d. Forged steel valve rocker arms (A and B )
1-17. Lubrication System (figs. 1-9 and 1-
with roller cam-followers are used. The rollers
10)
are hardened and honed to provide an extremely
a. General. The main pressure oil pump draws
smooth and permanent contact surface. Hollow
oil from the pressure oil pump compartment in
rocker arm shafts and drilled passages in the
the oil pan. This compartment is fed by the
rocker arms convey oil to all moving parts.
scavenge oil pump which picks up oil from both
ends of the engine oil pan. The pressurized oil is
1-16. Camshafts
forced through the engine oil coolers and main
oil filter to the engine oil galleries and bearings.
Note. T h e k e y  letters shown below in
A pressure regulator valve, located on the right
parentheses refer to figure 1-8.
side of the crankshaft damper and oil filter
housing, is influenced by the pressure in the
a. The left and right camshaft assemblies (C
main bearing oil gallery and returns the in-
and K) are mounted, one on each bank, on the
coming excess unfiltered oil to the oil pan. A
cylinders and operate the valve mechanism. The
small portion of the pressure oil is diverted, after
camshafts are hollow to provide oil passages for
passing through the main oil filter, and passes
pressure lubrication to the valve parts and to
through the auxiliary oil filter to provide the
permit deflection when the cylinders fire,
turbosuperchargers and the fuel injection pump
Tubular molded rubber hoses enclose the
with oil having a greater degree of filtration. The
camshafts between cylinders.
piston cooling oil pump picks up oil from the end
b. Each camshaft is driven by the accessory
compartment (rear) of the oil pan and delivers it
drive gear (M), accessory drive gearshaft
to the piston oil sprayer nozzles. These nozzles
assembly (H), camshaft drive bevel gearshaft
are located in the crankcase, below each
(G), camshaft drive gearshaft (E), and camshaft
cylinder, and provide a continuous oil spray to
driven gear (D) through an inclined quill type
the pistons and cylinder walls.
camshaft drive shaft (F). The drive shafts can be
rem oved to permit separate rotation of the
b. Oil Pan. The oil pan (figs. 1-1 and 1-4) is a
one-piece, aluminum alloy casting divided into a
camshafts for engine timing. When camshafts
pressure oil pump compartment, oil reserve
are correctly' positioned in relation to the
compartment, and the end compartments at the
crankshaft, the drive shafts have different
front and rear of the pan. The oil pan is designed
number of splines on each end and this allows
to maintain a constant oil level above the main
them to be inserted in the camshaft bevel
pressure oil pump pickup tube in the pressure oil
gearshafts without disturbing relationship
pump compartment during vehicle operation
between camshafts and crankshaft.
regardless of the angle at which the engine may
be inclined.
1-7

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