New Generation N62 Engine Chapter 3 P.60
Course Contents/Background Material
© BMW AG, Service Training
Coolant flow has been optimized. The engine is warmed up as
quickly as possible after a cold start, and even and sufficient
engine cooling while the engine is running is also ensured.
The cylinder heads are supplied with coolant in a cross-flow
pattern (previously longitudinal). This ensures more even tempe-
rature distribution to all cylinders.
The cooling system ventilation has been improved and is carried
out via ventilation ducts in the cylinder heads and in the radiator
(see the overview of the coolant circuit).
The air in the cooling system accumulates in the expansion tank.
When a pressure of 2 bar is reached in the expansion tank, the
air is intentionally blown clear by the expansion tank breather
cap pressure relief valve.
Note
Using the ventilation ducts means that it is not necessary to
carry out a particular ventilation routine during coolant
exchange.
The complex coolant area and the targeted small ventilation
bores mean that a certain time should be allowed after the
cooling system has been filled for the air to evacuate (see
Workshop Manual).
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