Coolant Temperature Alarm; Sender Unit For The Coolant Temperature Gauge - Yanmar 3JH4E Service Manual

12. Electrical system

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.
Operating temperature
Electric capacity
Response time
Indication color
Tightening torque
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.
Part code No.
Type
Rated voltage
ON 97-103 deg. C
DC 12V, 1A
within 60 sec.
Black
23.5-31.4 Nm
(2.40-3.20 kgf-m)
119773-91700
Thermistor switch
12V
Water temperature
sender
Inlet for water heater
Water temperature alarm circuit
Pilot lamp
Water temperature unit
PT 3/8
M4
314
Water temperature
switch
Fresh water pump
011080-00E
Fuse Main switch
Alarm buzzer
Battery
011081-00E
Green
011082-00E
ISO R3/8 Taper
011083-00E