Turbocharger System Description: Cooling

The turbocharger is water cooled, which considerably lowers the temperature in the bearing housing. Temperature reduction reduces the risk of oil boiling and the resulting damage. The coolant is taken via a pipe from the front of the cylinder block.

After passing the bearing housing, the coolant is led on via pipes to the expansion tank. When the engine is switched off and the coolant pump has stopped, the coolant in the system self-circulates through thermo-siphoning. After the engine has been run hard, a boiling/bubbling noise may be audible. This afterboil is completely normal.