Cooling System Description; Coolant Level; Draining And Flushing The Cooling System; Water Pump - Datsun 620 Series 1977 Service Manual

DESCRIPTION
COOLANT LEVEL
DRAINING AND FLUSHING THE
COOLING SYSTEM
WATER PUMP
REMOVAL AND INSTALLATION
DISASSEMBLY
INSPECTION
AND ADJUSTMENT
TORQUE COUPLING
REMOVAL AND INSTALLATION
DESCRIPTION
The
cooling
system
is
of the
con
ventional pressure
type
A
centrifugal
pump installed
on
the
timing
chain
cover serves
to
circulate
the
coolant
The pressure
type
radiator filler cap
installed
on
the radiator
operates
the
cooling
system at
higher
than atmos
pheric
pressure
The
higher
pressure
raises
the
boiling point
of the coolant and in
Cooling
System
COOLING SYSTEM
CONTENTS
CO 2
CO
2
OISASSEMBL
Y
INSPECTION
TEM
COUPLlNG
INSPECTION
THERMOSTAT
REMOVAL AND INSTALLATION
INSPECTION
RADIATOR
REMOVAL AND
INSTALLATION
INSPECTION
CO 2
CO 2
CO 3
CO
3
CO 3
CO 3
CO 4
creases
the
cooling efficiency
of the
radiator
When the thermostat
is
closed the
coolant
remains in the
cylinder head
and block for swift
warming
up
of
the
engine After
it
reaches normal oper
ating temperature
the
coolant circu
lates
through
the radiator
The
cooling
fan
drive is of
a
coupling
type
COOLANT LEVEL
The coolant level should be check
ed and maintained
at
SO
mm
197 in
below the upper face of filler neck
when the
engine
is
cold
C0055
Fig
CO I
Cooling
ry lem
Caution
To avoid serious
personal
injury
never remove
I3diator cap
quickly
when
engine
is hot Sudden
release of
cooling
system pressure is
very
dangerous
CO 2
CO 4
CO 4
CO 4
CO 5
CO 5
CO 5
CO 5
CO 5
CO 5
CO 6
If it
is
necessary
to
remove
radiator
cap wben radiator is hot
turn
cap
slowly
counterclockwise
to
the r
step
After all pressure in the cool
ing
system is released
tom
cap
passing
the
stop and
remove
it
DRAINING AND FLUSHING
THE COOLING SYSTEM
To drain the
cooling
system re
move
radiator cap
release drain cock
at
the bottom of radiator and drain
plug
on
the
right
side of
cylinder
block If the heater
system
is installed
set
heater
temperature
control valve
to
open
position
After the coolant
is
drained
completely
close drain cock
and
plug and refill the system with
clean soft
water
WATER PUMP
The
water
pump
cooling
fan
pulley
and
torque
coupling
are
a
unitized
construction
The
water
pump
is
of
a
centrifugal
type
which is mounted
on
the
engine
front
cover