New Generation N62 Engine
Chapter 3 P.61
Course Contents/Background Material
© BMW AG,
Service Training
Fig. 45: Coolant flow in the engine block
The coolant flows from the water pump through the feed pipe (1)
in the engine's V, and to the rear side of the engine block. This
area has a cast aluminium cover (see following illustration).
From the rear side of the engine, the coolant flows to the
external cylinder walls, and from there into the cylinder heads
(blue arrows).
The coolant then flows from the cylinder heads in the engine
block V (red arrows) and through the connection (3) to the
thermostat.
The still cold coolant flows from the thermostat directly into the
water pump and back to the engine (short circuit).
When the engine reaches operating temperature (85 ºC-110 ºC),
the thermostat closes the small coolant circuit and opens the
large coolant circuit, including the radiator.
Index
Description
1
Coolant from the coolant pump through the feed pipe to the rear face
of the engine
2
Coolant from the cylinder walls to the thermostat
3
Connection to water pump/thermostat
KT-7728
