Camshafts

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