Malfunctions
Group 30: Electrical system
24
Fault tracing
Fault condition
Coolant temperature e110 °C (+230 °F) for
more than 15 seconds.
Possible reason
•
Low coolant level.
•
Blocked sea water filter or sea water intake.
•
Worn impeller in seawater pump.
•
kinked/leaking/blocked hose on the suction side
(sea water).
•
Slipping or broken drive belt for circulation pump.
•
Faulty thermostat.
•
Incorrect pressure cap on expansion tank.
•
Fault in the coolant temperature sensor cable be-
tween the MDI and the sensor.
•
Faulty coolant temperature sensor.
•
Blocked heat exchanger.
•
Poor flow through the cooling system due to worn
coolant pump/seawater pump.
Suitable action
1. Check the coolant level.
2. Check that the system does not leak.
3. Check the drive belt tension for the circulation
pump.
4. Check that the sea water filter is not blocked.
5. Check the impeller in the sea water pump.
6. Change the thermostat.
7. Check the pressure cap on the expansion tank.
(see “checking the pressure valve in the filler cap”
in the mechanical workshop manual for the en-
gine)
8. Check the cables and the connectors between the
engine connector at the MDI and the coolant tem-
perature sensor.
9. Check the sensor.
10.Clean the heat exchanger. (see “clean the heat
exchanger” in the mechanical workshop manual
for the engine)
11.Change coolant pump/seawater pump.
https://www.boat-manuals.com/
