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N55 Engine
Coolant Passages
The coolant passages in the cylinder head are also used for indirect cooling of the fuel
injectors. The following graphic clearly shows that the coolant flows over the valves and
the fuel injectors, thus reducing the heat transfer to the components to a minimum.
N55, casting of the coolant passages in cylinder head
Index Explanation
1
Channel, intake valves
2
Channel, fuel injectors
3
Channel, exhaust valves
4
Connection, coolant hose to thermostat (small cooling circuit)
5
Connection, coolant hose to radiator (large cooling circuit)
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