ELECTRICAL AND ECU
Air Heater Components and Functions
12-14 6LY3 Service Manual
© 2007 Yanmar Marine International
Heater plugs (Figure 12-21, (1)) are available for
this engine as an aid to starting in cold weather.
The heater plugs are installed on top of the
intercooler (Figure 12-21, (3)) to heat the charging
air and facilitate easier engine starting. The heater
plugs are automatically controlled by the ECU
(Engine Control Unit) (Figure 12-18, (1)) through
the coolant temperature sensor.
When setting the starter switch to ENGINE ON, the
heater plug automatically turns on for 30 seconds
when the coolant temperature is 10°C (50°F) or
less.
After the engine starts, the heater plug stays on for
a maximum of 10 minutes or until the coolant
temperature reaches 45°C (113°F). The heater
plugs then cut off.
Figure 12-20
Figure 12-20
Figure 12-21
Figure 12-21
1 – Heater Plug
2 – Seal
3–Intercooler
Heater Plug Specifications
Part No. 119575-77050
Rated Current 58A
Rated Voltage DC 11V
Tightening Torque 25 N·m (18.4 lb-ft) or less
40
30
20
10
0
-5°C 0°C 5°C 10°C 15°C 25°C
(23°F) (32°F) (41°F) (50°F) (59°F) (77°F)
Coolant Temperature
Pre-Heat Time (seconds)
0006355
(1)
(2)
(3)
0006284
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