ENGINE
Inspection
• Water
pump
(1)
Inspect
the
as-removed
pump
for
crack in
the
casing, evidence
of
failure in
the
seal
unit
and
damage
to
the
impeller.
(2)
Spin
the
impeller
by
hand
to
see
if
the
shaft
rotates
rough and,
if
so, the
pump
should be replaced
as
a whole.
(3) Inspect
the
fan blades and
hub
for
damage.
(4)
Check
the
fan belt for
permanent
stretch.
A
stretched
or
otherwise
deteriorated
belt
must
be replaced. Cracks in
the
belt
mean
that
the
belt is aged
too
much
to
stand
further
use.
• Bypass hose
Check the hose for cracks,
deterioration
or
other
defects.
Installation
• Water
pump
and
fan
belt
Install the
pump
by reversing
the
sequence
of
removing steps and,
after
putting
on
the
belt,
adjust its tension
as
follows:
The
belt
is
in properly tensioned
condition
if
its middle
part
between
alternator
pulley and
crank
pulley deflects 10
to
12
mm
(0.4
to
0.5
in.) when pushed with a fingertip.
To
adjust
the
tension, displace the
alternator
in place.
After
displacing
the
alternator
to
give a
proper
tension
to
the
belt, tighten
the
support
bolt
and brace
bolt
good and hard.
Adjusting fan
belt
tension
2·46
[NOTE]
Check
to
be sure
that
the bypass hose
is
installed away from
the
cooling fan.
THERMO SWITCH
This switch
is
installed
on
the cylinder head,
on
the
front
end face
of
its right-hand part.
The
actuating element,
built
in the switch
body,
responds
to
the
change in
coolant
temperature
and closes
the
switch
contact
at
1
08
~
114
0
C
(226
to
237
0
F)
of
rising
coolant
temperature.
As
the
switch closes,
the
warning
lamp
lights
up
to
alert the
operator,
telling him
to
take a
necessary step, namely, reducing the load, refill
the cooling system
as
necessary
or
check the
cooling-system
components
for
the
cause
of
abnormal
temperature
rise.
Thermo
switch
THERMOSTAT
The
thermostat,
located in the
path
of
return-
ing
coolant,
has a wax-pellet expanding and
contracting
in response
to
the rise and fall
of
coolant
temperature.
By its expanding and
contracting
movements, the pellet actuates
the valve
to
control
the
coolant
flow rate in
the
return line
to
the radiator. When
coolant
tem-
perature
is
low, a little
coolant
is
admitted
by
the
thermostat
direct
into
the
suction
side
of
the
pump,
thereby
reducing
the
flowrate
through
the
radiator.
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