Water Pump - Datsun 1968-1973 510 Owners Workshop Manual

Chapter
2
Coohng
system
47
6 Radl8tor
replacement
1
Reflttmg tile
radIator and shroud
hf flttedl
IS
the
reverse
sequence to
removal
2 If
new
hoses
are to
be fItted
they
can
be
a
little dIfficult
to
fit
onto
the radiator
so
lubricate them with
a
little soap
3 RefIll
the
coohng system as
deSCribed
10
SectIon 4
7
Thermostat
removal
testing
and
replacement
1 PartIally dram the cooling system usually 4
Imp
plOts
IS
enough as
described
10 SectIon
2
2 Slacken
the top radiator hose
at
the thermostat housing and
remove
the hose
3 Undo and
remove
the
two nuts
and washers that
secure
the
thermostat housing
to
the cylinder head elbow
4
Carefully 11ft the thermoltat
housmg
away from the elbow
Recover the JOlOt washer
adhering
to
either the housing
or
cylinder head elbow
5
USing
a
screwdriver
carefully
ease
the thermostat from
Its
seatm9
6 Test the thermostat for
correct
functIoning by suspending
t
on a
strlOg
In a
saucepan of cold
water
Also
suspend a
therm
meter
In
the
water
Heat the
water
and
note
the
temperature
at
which the thermostat
begins to
open
Continue
heating
the
water
until the thermostat
IS
fully
open
Then let
It cool down
naturally
The
readings
taken should compare with those given
In
specifications
at
the beginning of thiS Chapter
7 If the thermostat does
not fully
open
In
boiling water
or
does
not
close down
as
the
water
cools then
It must
be
discarded and
a
new
one
obtained Should the thermostat be
stuck
open
when cold thiS Will
usually
be apparent when
removing It
from the cylinder head
8
Refitting the thermostat
IS
the
reverse
sequence
to
removal
Always
ensure
that the thermostat hOUSing and cylinder head
elbow
mating
faces
are
clean and flat Ifthe thermostat
housmg
or
elbow
IS badly corroded fit
a
new
hous ng Always
use a new
gasket
9 It
15
advantageous
to
fit
a
thermostat that does
not open too
early
In
the Winter months I f
a
Winter thermostat
15
fitted
prOVided the Summer
one IS
stilI functioning correctly
It can be
placed on
one
Side and refitted
In
the
Spnng
Thermostats
should last for
two to
three
years
before renewal becomes
deSirable
FIg
2 3 Removal of
gasket and thermoltat See 71
8 Water
pump
removal end
replacement
Dram
the
coohng syltem
as
deSCribed
10
SectIon 2
2 When
a
fan shroud
IS
fItted undo and
remove
the four bolts
that
secure
the fan shroud
to
the radIator and
remove
the
shroud
3 Slacken the alternetor
mountmgs
and push the
Unit
towards
the engme
LIft away the fan belt
4
Undo
and
remove
the four
bolts
and lock washers thet
secure
the fan blede assembly and pulley to the hub L ft away the fan
blade
assembly
and
pulley
5 Undo and
remove
the fIVe bolts and washers that
secure
the
water pump
to
the front
cover
LIft away the water pump end
ItS
gasket
6 Refitting
the water
pump
IS
the
reverse
sequence
to
removal
The follOWIng addItIonal
pomts
should be noted
a
Make
sure
the
mating
faces of the front
cover
and
water
pump are
clean
b
RefIll
the
coohng system as
deSCribed
In
SectIon
4
cl Adjust
the fan belt
tensIon as deSCribed
10
SectIon 12
d
R
un
the engme and check for
water
leaks
g Water pump
InspectIon
and overhaul
I
nspect
the body and
vane
for SignS of
excessive corrosion
Also check the
beanngs
for signs of
excessive
end
play or
roughness when the spmdle IS bemg rotated
Should
the
bearing
condItIon be
satIsfactory
and yet
a
rumble
or
squeak IS emitted when bemg driven by the
fan belt
use a
httle NPSL N
ssan water
pump
seallubrlcantl to
check the
nOise
If the beanngs
are worn or
the pump leaking
water
a new
pump WIll have
to
be obtamed and tltted
es
It IS not
pOSSIble
to
overhaul the
unit
10 FlUId
couphng
1 When
an air
conditioning
Unit IS
fitted
to
the
car
the water
pump
IS
fItted WIth
a
flUId
coupling
whIch hmlts the fan speed
to
a
maximum
of 3000 rpm
2 Should correct functlonrng
of the
coupling
be
suspect
care
fully separate the couplmg halves and clean
out
all
traces
of the
special
011 Do not use
any solvents around the
area
of the rubber
FIg
24 Removal of
water
pump from front
cover
See 8