Yanmar 4JH4E - Coolant Temperature Alarm; Sender Unit for the Coolant Temperature Gauge

12. Electrical system
314
12.7.3 Coolant temperature alarm
A water temperature lamp and water temperature
gauge, backed up by an alarm in the instrument
panel, are used to monitor the temperature of the
engine coolant. A high thermal expansion material
is set on the end of the water temperature unit.
When the coolant temperature reaches a specified
high temperature, the contacts are closed, and an
alarm lamp and buzzer are activated at the
instrument panel.
12.7.4 Sender unit for the coolant
temperature gauge
The water temperature sender unit has a mounting
seat for mounting on the fresh water pump unit.
Water temperature is measured when the coolant
flows into the thermostat housing after leaving the
cylinder head.
Operating temperature ON 97-103 deg. C
Electric capacity DC 12V, 1A
Response time within 60 sec.
Indication color Black
Tightening torque
23.5-31.4 Nm
(2.40-3.20 kgf-m)
Part code No. 119773-91700
Type Thermistor switch
Rated voltage 12V
Water temperature
sender
Inlet for water heater
Water temperature
switch
Fresh water pump
011080-00E
Fuse
Battery
Main switch
Alarm buzzer
Pilot lamp
Water temperature unit
011081-00E
Green
PT 3/8
011082-00E
Water temperature alarm circuit
011083-00E
M4 ISO R3/8 Tape
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