Datsun 510 Workshop Manual page 79

Cooling IJStem
Loosen belt then
remove
fan blade and
pulley
from hub
Remove five bolts pump
assembly
and
gasket
from front
cover
Disassembly
The water
pump
body
is made of aluminum
and its
bearing
outer
race
is
press
fit For this
reason
the
body shaft bearing
should
not
be
disassembled
Inspection
Inspect
pump
assembly for the following
con
ditions and replace
it if necessary
Badly
rusted
or
corroded
body assembly
and
vane
Excessive end
play
or
roughness
of
bearings
in
operation
Installation
Make
sure
to
clean the gasket surfaces
on
pump and front
cover
Always
use new
gasket
when
installing
pump
assembly
Be
sure
to
tighten
bolts
uniformly
Fill
cooling system
and check for leaks
at
pump
I nstall fan
pulley
and fan blade and
tighten
fixing
bolts
securely
Install belt and
adjust
for proper tension
THERMOSTAT
A
wax
pellet
type
thermostat is mounted in
the thermostat
housing
at the
cylinder
head
water outlet
adjacent to
the inlet
manifold
The function of thermostat is
to
control the
flow of coolant
facilitating fast engine
warm
up and regulating
coolant
temperature
The
thermostats
are
designed to
open
and close
at
predetermined
temperatures
and if not
opemting
properly
should
be
removed and
tested
as
listed below
Removal
and Installation
Drain coolant partially
Disconnect
upper
radiator
hose
at water
outlet
fig 127
Removing
Thermostat
Loosen two
securing
nuts
and
remove
water
outlet
gasket
and thermostat
from ther
mostat
housing
After checking
thermostat
satisfactorily
in
stall
replacing with
a new
housing gasket
Reinstall
water outlet and
tighten securing
nuts
Replenish
coolant and check for leaks
RADIATOR
The radiator is
a
conventional down flow
type
having
the
top
and bottom tanks to
distribute
the coolant flow
uniformly
through
the
ver
tical tube of the radiator
core
The mdiator filler cap is designed to
maintain
a
pre set pressure
0 9
kglem2
13 Ib sq in
above
atmospheric
pressure The relief valve
consists of
a bIow lf1
valve and
a vacuum
valve It
helps to
prevent coolant
loss from
boiling
for
by raising
the pressure
on
the
coolant On the
contrary
as
the pressure is
reduced below
atmospheric
pressure
the
vacuum
valve allows air
to
re enter
the
radiator
preventing
the formation of
vacuum
in
the
cooling
system
The
bottom tank
on cars
equipped
with
the
automatic transmission inoorplrates an
oil
cooler for the transmission
fluid
Removal and Installation
Drain coolant into
a
clean container
Remove front
grille
19