Toro 03116SL Rev E Service Manual Groundsmaster 4100 D Preface Publication

Temperature Sender
The temperature sender is  located near the alternator
on the water flange attached to the engine cylinder head
(Fig. 36). There is a gray wire attached  to the terminal
of the switch.
1
Testing
1.
Lower coolant  level in the  engine and remove  the
temperature sender from water flange.
2.
Put switch in  a container of oil with  a thermometer
and slowly heat the oil (Fig. 37).
2
CAUTION
Figure 36
2.
Handle the hot oil  with extreme care to prevent
personal injury or fire.
1.
Temperature sender
Alternator
NOTE:  Prior to taking resistance readings with a digital
multimeter, short the meter test leads together. The me-
ter  will display  a  small resistance  value (usually  0.5
ohms or less). This resistance is due to the internal re-
sistance of the meter and test leads. Subtract this value
from from the measured value of the component you are
testing.
VOA
3.
(ohms setting) as the temperature increases.
Check resistance  of the  sender with  a multimeter
Figure 37
A.  The meter should indicate more than 600 ohms at
70
oF (21oC).
B.  The  meter should  indicate  approximately  460
ohms at 100oF (38oC).
C. The meter should indicate from 54 to 78 ohms at
200
oF (93oC).
D. Replace sender if specifications are not met.
Install sender to the water flange.
4.
A.  Clean threads of water  flange and sender thor-
oughly. Apply  thread sealant to  the threads  of the
sender.
B.  Screw sender into the water flange. Torque send-
er from 16 to 20 ft−lb (21.7 to 27.1 N−m).
C. Reconnect gray wire  to sender. Apply skin−over
grease (Toro Part No. 505−165) to sender terminal.
5.
Fill engine cooling system (see Operator’s Manual).
Electrical System
Page 5 − 24    Rev. E
Groundsmaster 4100−D
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