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Cooling system (liquid-cooled engine) 3.3
VE proper coolant mixture (see this Chapter's
Specifications). Note: Pour the coolant in
slowly to minimise the amount of air entering
3 e system. Loosen the bleed valve on the
cylinder head to release any trapped air, then
bghten the valve securely (see illustration
27). If necessary, top-up the reservoir (see
3aily (pre-ride) checks) and fit the cap.
14 Start the engine and allow it to idle for 2 to
3 minutes. Flick the throttle twistgrip part
open 3 or 4 times, so that the engine speed
nses, then stop the engine. Release any
trapped air through the bleed valve, then
bghten the valve securely. Check the system
'w leaks.
h
Warning: Make sure that the
machine i s on i t s centre stand
and that the rear wheel i s off the
ground before bleeding the cooling
system. I f necessary, place a support
under the stand to prevent the rear wheel
wntacting the ground.
15 Let the engine cool and check the coolant
level (see Daily (pre-ride) checks), then install
%
bodywork (see Chapter 7).
16 Do not dispose of the old coolant by
w r i n g it down the drain. Pour it into a heavy
dastic container, cap it tightly and take it into
an authorised disposal site or garage
-
see
Waming in Section 1.
ature gal
der
-
- A ---I---
3
Temper;
and sen
check ar
IU
r aplacar llal
IL
T
Temperature gauge
Check
1 The circuit consists of the sender mounted
m
the cylinder head and the gauge assembly
in the instrument panel. If the system
malfunctions, first check the coolant level (see
Daily @re-ride) checks). If the level is correct,
check that the battery is fully charged and that
the fuse is good (see Chapter 9).
2 If the gauge is still not working, open the
engine
access
panel in the
storage
compartment, disconnect the wire from the
sender and connect it to earth (ground) with a
jumper wire (see illustration). Turn the
ignition switch ON; the temperature gauge
needle should swing over to the 'H' on the
gauge. If the needle moves as described,
check the operation of the sender (see Steps
5 to 7).
Caution: If the needle moves, turn the
ignition
OFF immediately
t o
avoid
damaging the gauge.
3 If the needle movement is still faulty, or if it
does not move at all, the fault lies in the wiring
or the gauge itself. Check all the relevant
wiring and wiring connectors; if all appears to
be well, the gauge is defective and must be
renewed.
Replacement
4 Refer to Chapter 9 for instrument cluster
removal
and
installation.
Note:
The
temperature gauge is an integral part of the
instrument cluster and cannot be obtained as
a separate item.
Temperature gauge sender
Check
5 Disconnect the battery negative (-ve) lead,
then disconnect the sender wiring connector
(see illustration 3.2). Using a continuity
tester, check for continuity between the
sender body and earth (ground). There should
be continuity. If there is no continuity, check
that the sender mounting is secure, then
recheck the operation of the gauge.
6 Remove the sender (see Steps
8
to 11
below). Fill a small heatproof container with
water and place it on a stove. Set a multimeter
to the ohms x 1 scale and connect the
positive (+ve) probe to the terminal on the
sender and the negative (-ve) probe to the
sender body. Using some wire or other
support, suspend the sender in the water so
that just the sensing portion and the threads
are submerged (see illustration). Also place a
thermometer capable of reading temperatures
up to 90°C in the water so that its bulb is
close to the sensor. Note: None of the
components should be allowed to directly
touch the container.
7 Check the resistance of the sender at
approximately 20°C and keep the water
temperature constant at 20°C for 3 minutes
before continuing the test. Then increase the
heat gradually, stirring the water gently.
A
Waming: This must be done very
carefully to avoid the risk o f
personal injury.
As the temperature of the water rises, the
resistance of the sender should fall. Check
that the correct resistance is obtained at the
temperatures specified at the beginning of
this Chapter. If the meter readings obtained
are different, or they are obtained at different
temperatures, then the sender is faulty and
must be renewed.
Replacement
Warning: The engine must b e
completely cool before carrying
out this procedure.
8 Disconnect the battery negative (-ve) lead
and drain the cooling system (see Section 2).
9 Disconnect the sender wiring connector
(see illustration 3.2). Unscrew the sender
and remove it from the cylinder head.
10 Apply a smear of a suitable non-
permanent sealant to the threads of the new
sender, then install it into the cylinder head
and tighten it securely. Connect the sender
wiring.
11 Refill the cooling system (see Section 2)
and reconnect the battery negative (-ve) lead.
3.2 Temperature sender wiring connector
3.6 Set-up for testing the temperature gauge sender
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