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REMOVAL
AND
INSTALLATION
To
replace
the
torque
coupling
follow
the
same
procedure
as
in the
water
pump
The torque
coupling
can
not
be
separated
from
the
water
pump
Cooling System
DISASSEMBLY
The
torque coupling
is
so
designed
that it
can not
be
disassembled
INSPECTION
Inspect torque
coupling
for
oil
leakage
If
necessary
replace
TEM COUPLl
G
For air conditioner
equipped
models
Tem
coupl i n g
is
a
type
of fan
coupling
which is
provided
with
a
temperature
control system
The conventional
coupling always
slips
the fan
at a
high speed
under
a
constant ratio
regardless
of the
engine
cooling
requirement
The
slipping
ratio
of the Tern
coupling
however is
properly
changed
with the
cooling
requirement
ON
denotes that
cooling
is
re
quired
and
the fan operates
up to
about 2
150
rpm When
high cooling
is
not
required
during
cold
season
with
the
engine
warmed up
etc
the oper
w
6
I
1
Bi metal
thermostat
2
Slide valve
3
Reserve
chamber
for
OFF
4
Bearing
5
Driving
chamber
for
ON
6
ouplingpart labyrinth
coon
Fig
CO 5 CrQM sectional view
of
Tem
coupl i n g
ation is
placed
under
OFF
condition
and the fan
slips
at
about 1 650 rpm
The
coiled
bimetal
thermostat
installed
on
the front
center
portion
of
the
Tem
coupling
detects
temperature
of
air
passing
through
the radiator
The
air
temperature
is
directly
relative
to
the
engine
coolant
tempera
ture
and the inside slide valve
is
opened
or
closed
as
required
and thus
the
ON OFF
control
is
performed
When
the
air
temperature
rises
the
bimetal
is
expanded
and the valve
is
opened
silicon oil
is
forwarded
to
the
groove
that
transmits
torque
and the
CO
4
system
is
placed
under
ON
con
dition
When
the
valve closes silicone oil
is
not
supplied
to
the
driving
chamber
oil
in
the
driving
chamber
is
accumu
lated
on
periphery
due
to
the centrif
ugal
force
and led into the
reserve
chamber
Now
oil
is
eliminated from
the
driving
chamber and the system
is
placed
under
OFF
condition
With this system when fan
cooling
is
not
required
the
output
loss
is
minimized
and
noise
can
be
far
reduced
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