Cooling system
66
Engine heater
Cold starting is one of the most important determining
factors regarding the service life of an engine. Fre-
quent cold starts followed by extended periods of
idling significantly increase wear on the engine. An en-
gine heater extends the service life of the engine and
the batteries. The heater lowers emissions during start
up and also prevents hunting.
The engine heater warms and circulates coolant
through the engine block. It is important that the en-
gine heater is of the right type, is correctly connected
and maintains the engine coolant at the right tempera-
ture.
The heating capacity is depending on the ambient
temperature but a guide line is to use a heater of 500–
750 W.
The heater should have its own circulation pump and
be located in a protected area.
NOTE! The rating of the engine heater shall be cho-
sen so that the incoming coolant temperature in the
engine does not exceed 50°C (122°F). If there are
any possibilities that the temperature may exceed
50°C (122°F) the heater should be equipped with a
thermostat.
1. Engine heater
2. Outlet, 1/4" NPTF
3. Inlet, 1/2" NPTF
4. Connector with protective cap
5. Appliance plug with protective cap
2. Outlet
1/4" NPTF
Nipple, Volvo Penta
Part no. 856483-3
4
1
5
3. Inlet
1/2" NPTF
∅ ∅
∅ ∅
∅ 16 mm
(5/8")
∅ ∅
∅ ∅
∅ 16 mm
(5/8")
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