THEORY OF OPERATION -- CONTINUED
CYLINDERS AND VALVES -- CONTINUED
A camshaft bearing surface is provided in each cylinder. The camshaft bearing is bored with the cylinder head
valve rocker support cover in place; therefore, the covers are not interchangeable and each must remain as a part
of a specific cylinder assembly. Each cylinder has replaceable camshaft bearings at the camshaft bore. Identifying
numbers are used on cylinder and covers to prevent mismatching. Counter bores in the rocker box and rocker
support covers accommodate the inter--cylinder rubber hoses and the steel flanges which enclose the camshaft
between the cylinders.
The stem of the intake valve (48) and exhaust valve (47) for each cylinder extends into the rocker box. Three
nested springs, compressed between two retainers and secured to the valve stem by two cone--shaped locks, hold
each valve to its seat. Each exhaust valve has a positive valve rotator which also serves as the lower spring re-
tainer. Valve clearance adjusting screws with flat swivel pusher pads are mounted on one end of the valve rocker
arms (1 and 2).
Forged steel valve rocker arms (1 and 2) with roller cam--followers are used. The rollers are hardened and honed
to provide an extremely smooth and permanent contact surface. Hollow rocker arm shafts and drilled passages in
the rocker arms convey oil to all moving parts.
The key numbers shown in parentheses refer to Figure
The left and right camshaft assemblies (3 and 10) are mounted, one on each bank, on the cylinders and operate
the valve mechanism. The camshafts are hollow to provide oil passages for pressure lubrication to the valve parts
and to permit deflection when the cylinders fire. Tubular molded rubber hoses enclose the camshafts between cyl-
Each camshaft is driven by the accessory drive gear (12), accessory drive gearshaft assembly (8), camshaft drive
bevel gearshaft (7), camshaft drive gearshaft (5), and camshaft driven gear (4) through an inclined quill type cam-
shaft drive shaft (6). The drive shafts can be removed to permit separate rotation of the camshafts for engine tim-
ing. When camshafts are correctly positioned in relation to the crankshaft, the drive shafts have different number of
splines on each end and this allows them to be inserted in the camshaft bevel gearshafts without disturbing rela-
tionship between camshafts and crankshaft.
Refer to Figures 1--7 and 1--8 while reading the following
General The main pressure oil pump draws oil from the pressure oil pump compartment in the oil pan. This
compartment is fed by the scavenge oil pump which picks up oil from the front end of the oil pan and by oil which
drains into the pressure compartment from the cover of the pressure pump compartment and the reserve compart-
ment. The pressurized oil is forced through the engine oil coolers and oil filter to the engine oil galleries, bearings,
turbosuperchargers, fuel injection pump and to the piston oil sprayer nozzles. These nozzles are located in the
crankcase below each cylinder and provide a continuous oil spray to the pistons and cylinder walls.