Thermostat Housing And Thermostat - Removal, Check And Installation; All Models - Yamaha TDM850 User Manual

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11 Heat the coolant, stirring it gently. When the
temperature reaches around 50°C the meter
should read 154 ohms. When the temperature
reaches around 80°C the meter should read
between 47 and 53 ohms. When the temperature
reaches around 100°C the meter should read
between 26 and 29 ohms. When the temperature
reaches around 120°C the meter should read 16
ohms. If the meter readings obtained are
different, or they are obtained at different
temperatures, then the sender is faulty and must
be renewed. 1996-on TDM models and all TRX
models
12 Fill a small heatproof container with water
and place it on a stove. Using an ohmmeter,
connect the positive (+ve) probe of the meter to
the terminal on the sender, and the negative (-ve)
probe to the body of the sender. Using some wire
or other support suspend the sender in the water
so that just the sensing portion and the threads
are submerged. Also place a thermometer
capable of reading temperatures up to 110°C in
the water so that its bulb is close to the sender
(see illustration). Note:
components should be allowed to directly touch
the container.
13 Heat the water, stirring it gently. When the
temperature reaches around 80°C the meter
should read 47 to 53 ohms. When the
temperature reaches around 100°C the meter
should read 26 to 30 ohms. If the meter readings
obtained are different, or they are obtained at
different temperatures, then the sender is faulty
and must be renewed.
Sender removal and installation

(all models)

14 Drain the cooling system (see Chapter 1).
On TDM and TRX models, remove the fuel tank
and air filter housing (see Chapter 4). On XTZ
models, remove the left-hand fairing side panel
(see Chapter 8).
15 Disconnect the sender wiring connector
6.5 Thermostat housing mounting bolt (arrowed) - TDM models
UNREGISTERED VI
5.12 Temperature sender testing set-up -
1996-on TDM models and all TRX models
(see illustrations 4.9a, b and c). Unscrew the
sender and remove it from the thermostat
housing.
None of the
16 Apply a suitable thread locking and sealing
compound to the sender threads, then install the
sender and tighten it to the torque setting
specified at the beginning of the Chapter. Take
care not to overtighten the sender as the housing
could be damaged.
17 Reconnect the sender wiring and top up the
cooling system (see Chapter 1).
Thermostat
thermostat - removal, check |8
and installation
Removal
Warning: The engine must be completely cool
before carrying out this procedure.
1 The thermostat is automatic in operation and
should give many years of service without
requiring attention. In the event of a failure, the
valve will probably jam open, in which
6.3 Slacken the clamp screws and pull off the
case the engine will take much longer than
normal to warm up. Conversely, if the valve jams
shut, the coolant will be unable to circulate and
the engine will overheat. Neither condition is
acceptable, and the fault must be investigated
promptly.
2 Drain the cooling system (see Chapter 1).
3 The thermostat is located in the thermostat
housing. On TDM and TRX models, remove the
fuel tank and air filter housing (see Chapter 4).
On XTZ models, remove the left-hand fairing side
panel (see Chapter 8). Slacken the clamps
securing the hoses to the housing and detach the
hoses, noting which fits where (see illustration
and 4.9b and c). On XTZ models, release the
clamp securing the overflow hose to the filler
housing and ^ neck and detach the hose.
4 Disconnect the fan switch and temperature
sensor wiring connectors (see illustrations 4.9a,
^
b and c). Where fitted, also slacken the screw
securing the earth lead and detach the lead.
5 Unscrew the bolt securing the thermostat
housing and remove the housing, noting how it
fits (see illustration and 4.9b and c).
6 Unscrew the two bolts securing the cover and
separate it from the housing (see illustration).
Withdraw the thermostat, noting
6.6a Unscrew the bolts and remove the cover ...
Cooling system 3«5
hoses
3
Scaned by Stalker