Yanmar 3JH4E Service Manual page 78

2. Inspection and adjustment
(6) Check the alarm lamps and devices
Before and after starting the engine, check to see that the alarm functions normally. Failure of alarm
cannot warn the lack of the engine oil or the coolant. Make it a rule to check the alarm operation
before and after starting engine every day.
When the sensor detects a problem during operation, the lamp comes on and the buzzer goes off.
Alarm lamps are located on the panel, buzzer is located on the back of panel.
Under normal conditions, the monitors are off. When there is a problem, the monitors light up.
Battery low
charge alarm
Coolant high
temperature
alarm
Lubricating oil
low pressure
alarm
Water in sail
drive seal
alarm
Water in fuel
filter alarm
(C type only)
Seawater
insufficient
flow alarm
(C type only)
Normal action of alarm devices
Alarm devices act as shown below. Check that the alarm lamps and buzzer are working normally, when
the key is turned on.
Key switch
Engine
Alarm buzzer
Battery low charge alarm
Coolant high temperature alarm
Alarm lamps
Lubricating oil low pressure alarm
Water in sail drive seal alarm
When the alternator output is too low, the lamp will come on.
When charge begins, the lamp will turn off.
(The alarm buzzer will not sound, when the lamp comes on.)
When the temperature reaches the maximum (95°
lamp will light.
Continuing operation at temperatures exceeding the maximum limit will
result in damage and seizure.
Check the load and the fresh water cooling system for any abnormalities.
When the lubricating oil pressure falls below normal, the oil pressure sensor
will register this and the lamp will come on and alarm will sound.
Continuing operation with insufficient oil pressure will result in
damage and seizure.
Check the oil level.
When seawater is detected between the seals of sail drive, the lamp will
come on and the alarm will sound.
This function is available only for 4JH4-TE and 4JH4-HTE.
This function is not available on this engine.
58
C
OFF → ON
Before start
Goes on
Light
Off
Light
Off
[203F] or higher), the
START → ON
Running
Stop
Off
Off
Off
Off