Cooling System
The coolant pump shell is integrated in the timing cover. The pump wheel is still driven by the auxiliary unit's transmission.
The coolant pump pumps coolant through the cylinder block, and also cools the cylinder head, cylinder sleeves, spark plug wells, intake ducts and fuel injection nozzles.
The coolant flows in at the coolant pump and passes through a number of channels before it collects and then flows out to the thermostat housing. If the thermostat housing is closed, the coolant passes via the by-pass channel directly to the coolant pump to then circulate through the cylinder block again.
For the turbocharged engine, the task of the cooling system is to supply the turbocharger with coolant.