11 53 000 Removing and installing/replacing coolant thermostat (M52TU / M54 / M56)

Remove fan clutch with fan impeller and fan cowl.

Drain and dispose of coolant.

NOTE: The water drain plug is located on the exhaust side on cylinder 2 in the engine block.

Installation:

Replacing sealing ring on water drain plug.

Tightening torque 11 11 5AZ. Refer to ENGINE - TIGHTENING TORQUES .

Vent cooling system and check for leaks.

Pull locks and disconnect water hoses.

Fig 1: Disconnecting Water Hoses

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Installation:

Loosen nut (1).

Release screws on thermostat housing, remove thermostat housing.

Fig 2: Removing Thermostat Housing

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Installation:

Keep sealing faces clean and free of oil.

Fig 3: Identifying Sealing Faces

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NOTE: Coolant thermostat is integrated in coolant thermostat housing and can only be replaced as a single unit.

Installation:

Replace seal (1).

Fig 4: Replacing Seal

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