Ford COUGAR 1968 Shop Manual page 316

8-32
GROUP 8
-
Engine
FIG.
5-Hydraulic Valve Lifter O p e r a t i o n
FIG.
6-Typical Lubrication System
holes in each rocker arm to lubricate from the valve rocker arm shaft. The
the valve and the push rod end of the oil from each rocker arm drains into
rocker arm. The excess oil spirals the push rod chamber through the
down the rotating push rod and assists push rod bore holes in the cylinder
in lubricating the tappet and push rod head.
seat. An oil outlet in the No.
1
rocker The oil in the push rod chamber
arm shaft support, exhausts excess oil drains back into the oil pan through
cored openings in the block
COOLING SYSTEM
The coolant is drawn from the
bottom of the radiator by the water
pump which delivers the coolant to
the cylinder block (Fig. 7).
As the coolant enters the block, it
travels through cored passages to
cool the entire length of each cylin-
der wall. Upon reaching the rear of
the cylinder block, the coolant is
directed upward into the cylinder
head where it cools the combustion
chambers, valves, and valve seats on
its return to the front of the engine.
At this point, the coolant flows
into the coolant outlet connection,
past the thermostat if it is open and
into the top of the radiator. A Distri-
butor Vacuum Control Valve (Temper-
ature Sensing Valve) is installed in the
coolant outlet elbow to increase distri-
butor advance under hot conditions.
This will temporarily increase the
idle speed and reduce the engine oper-
ating temperature. If the thermostat
is closed. a small portion of the cool-
ant is returned to the water pump for
recirculation. The entire system is pres-
surized to 13-15 psi.
CLOSED CRANKCASE
VENTILATION SYSTEM
Ventilating air enters the crankcase
through the oil filler cap a t the front
of the valve rocker arm cover (Fig. 8).
The oil filler cap is sealed to prevent
atmospheric air entrance, but the top
of the filler cap is connected to the
engine air cleaner by a hose to admit
clean air to the crankcase. If the crank-
case ventilation system becomes re-
stricted, a backflow condition will
occur, thereby venting the crankcase
gases into the air cleaner and induc-
tion air system.
The air flow is metered by a re-
striction in the oil filler cap. The air
flows from the valve rocker arm cham-
ber, through the push rod holes and
into the push rod chamber. Air also
flows between the crankcase and rock-
er arm chamber through the oil drain
holes and push rod holes in the cylin-
der 'head. Air flows to and from the
cylinder front cover and crankcase
through the front cover oil drain holes
at the front of the cylinder block.
From the valve rocker arm cover,
the ventilating air passes through
the crankcase ventilation regulator
valve at the rear of the rocker arm
cover and into the intake manifold
through a connecting hose and tube.