Thermostat Housing: Service and Repair

11 42 035 Removing And Installing/Replacing Thermostat Housing (N54)







WARNING:
Risk of scalding.
Only perform this repair work on an engine that has cooled down.







IMPORTANT:
You must protect the alternator against contamination before carrying out any work on the oil or cooling circuit.
A residual amount of coolant emerges when the hoses are detached. A residual amount of oil emerges when the oil-coolant heat exchanger is released. Have a cleaning cloth ready.
Cover alternator with suitable auxiliary materials.







Necessary preliminary tasks:
- Drain coolant
- Remove fan cowl







Release screw (1).
Tightening torque 11 42 3AZ.
Pull engine oil pipes down off the thermostat housing.

Installation note:
Replace O-rings.







Release screws (1) on thermostat housing.
Remove oil coolant heat exchanger towards front.

Installation note:
Replace gasket.







Reassemble vehicle and set in horizontal position.
Vent cooling system and check for water leaks.
Start engine and run at idle until oil pressure warning lamp goes out.
Turn off engine.
Wait approx. 5 minutes and then check engine oil level.
Top up engine oil if necessary.