Lubrication System; Air Intake System; Cooling System - Ford COUGAR 1968 Shop Manual

PART 8-3
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289 And 302 V-8
8-6
1
FIG.
70-lubrication System
or grooves in the main bearings to
lubricate the crankshaft journals. The
timing chain and sprockets are lubri-
cated by oil forced through a drilled
passage leading to the oil pump inter-
mediate shaft. Oil flows from the pas-
sage through a groove cut into the
thrust plate and passes around the
camshaft. It then flows through two
grooves cut into the socket and is de-
flected onto the timing chain.
The crankshaft is drilled from the
main bearings to the connecting rod
tiearings.
Oil passages are drilled from the
main oil gallery to each valve lifter
oil gallery. Oil from here feeds the
valve lifter assemblies. A reservoir at
each valve lifter bore boss traps oil
so that oil is available for valve lifter
lubrication as soon as the engine
starts.
The oil hole in the hydraulic lifter
is indexed with the lifter oil gallery
and oil flows into the lifter. Oil in
the lifter is then metered through
the metering valve (disc), through
the oil passages in the push rod cup
and then flows up the hollow push
rod. In this position, the drilled hole
in the ball end of the push rod is
indexed with a drilled hole in the
rocker arm and the oil lubricates the
upper valve train bearing areas (Fig.
10). Excess oil is returned to the oil
pan through drain back holes located
at each end of the cylinder heads
and block (Fig. 10).
AIR INTAKE SYSTEM
The temperature of the air enter-
ing the air cleaner is thermostatically
controlled by an air intake duct and
thermostat assembly (Fig. 2). This
system supplies warm air to the en-
gine during the warm-up period, ce-
sulting in better fuel vaporization
and reducing .the possibility of car-
buretor icing. The air duct shroud
and tube assembly together with the
air duct and thermostat assembly di-
rect warm air into the air cleaner
and carburetor.
If the temperature of the air pass-
ing over the thermostat is less than
75 degrees F., the valve plate in the
air duct is held in an up or heat on
position by a valve plate tension
spring. When the valve plate is in the
"heat on" position, the air entering
the air cleaner is drawn through the
shroud and tube assembly. The air
passing through the shroud and tube
is first directed over the exhaust mani-
fold and heated.
A wax-filled thermostat is con-
nected to the valve plate by a ther-
mostat rod. The incoming air passes
over the thermostat before entering
the air cleaner. As the temperature
of the air passing over the thermostat
approaches 85 degrees F., the wax
begins to expand and pushes the ther-
mostat rod against the valve plate. The
tension of the valve plate spring is
overcome and the valve plate is moved
downward to partially close off the
warm air duct to allow the cooler air
from the engine comp.artment to mix
with the warm air directed from the
exhaust manifold.
If the temperature of the incom-
ing air is approximately 105 degrees
F., the valve plate moves downward to
a heat-off position to close off the
warm air duct. Cooler air from the
engine compartment is then directed
to the air cleaner without passing over
the exhaust manifold.
COOLING SYSTEM
The coolant is drawn from the
bettom of the radiator by the water
pump which delivers the coolant to
the cylinder block (Fig. I I).
The coolant travels through cored
passages to cool the entire length of
each cylinder wall. Upon reaching
the rear of the cylinder block, the
coolant is directed upward into the
cylinder heads, where it cools the
combustion chambers, valves and
valve seats on its return to the front