MAINTENANCE WORK ON FRAME AND ENGINE 173
9.66Cooling system
400415-10
The water pump with a 3D water pump wheel in the engine ensures forced circulation of
the coolant. The heat exchanger enables faster warming of the engine oil at the start of a
journey and better heat dissipation for the engine oil during the journey.
The pressure in the cooling system resulting from heat is regulated by a valve in the radi-
ator cap . The heat expansion causes the surplus coolant to flow into the compensating
tank . When the temperature falls, this surplus coolant is sucked back into the cooling
system.
400416-10
Cooling takes place by means of the air stream and a radiator fan , which is controlled by
a thermoswitch.
The lower the speed, the less the cooling effect. Dirty cooling fins also reduce the cooling
effect.
9.67Checking the coolant level
Warning
Scalding hazard During motorcycle operation, the coolant gets very hot and is under pressure.
– Do not open the radiator, radiator hoses and other components of the cooling system while the engine is warm. Let the engine
and cooling system cool down first. If you get scalded, immediately flush the affected areas with lukewarm water.
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