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Ancillary Components And Drive Belts - Removal

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Remove the following components:

Fig 1: Identifying Ancillary Components And Drive Belts
G03390407Courtesy of BMW OF NORTH AMERICA, INC.

To remove the drive belts: 

The tensioning pulley is pushed back using a Torx tool in the recess provided (1) and fixed in this position by inserting a locking pin as shown (2).

The cooling module of the N73 includes an external engine oil cooler. The engine oil cooler is located in front of the engine coolant radiator above the A/C condenser.

Fig 2: Identifying Locking Pin
G03390408Courtesy of BMW OF NORTH AMERICA, INC.

The engine oil flows from the oil pump through a channel in the crankcase to a connection on the alternator support. The alternator support has an oil thermostat (arrow to the right).

A wax element in the oil thermostat opens the supply flow to the engine oil cooler from an oil temperature of 100 °C to 130 °C.

A partial amount of engine oil will permanently bypass the oil thermostat, even when it is fully open and flows uncooled through the engine.

The engine oil cooler helps to keep the engine oil temperature below 150 °C.

Fig 3: Identifying Oil Thermostat
G03390409Courtesy of BMW OF NORTH AMERICA, INC.