18...... Replacing Exhaust Flap On Exhaust System (N54)

Necessary preliminary tasks: 

• Carry out diagnosis of exhaust flap with DIS diagnosis system.

If replacing the exhaust flap (1), it must be cut away from the rear muffler.

Installation: 

• Modify exhaust pipe trim.

Fig 1: Identifying Exhaust Flap

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Deburr tailpipe (1).

Fig 2: Identifying Tailpipe

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Push on terminal (1)

Protrusion (2) at pipe neck 6 mm to 10 mm.

Fig 3: Identifying Terminal And Protrusion

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Lightly tighten clamping screw (1).

Push on seal (2)

Fig 4: Identifying Clamping Screw And Seal

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Push on new exhaust flap (1).

Installation: 

Make sure seal is correctly seated.

Install and tighten down screws (2).

Tightening torque. See 18 31 8AZ  in 18 31 EXHAUST PIPE WITH CATALYTIC CONVERTER/COMPLETE SYSTEM .

Fig 5: Identifying Exhaust Flap And Screws

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Insert screw (1) and tighten down.

Tightening torque. See 18 31 8AZ  in 18 31 EXHAUST PIPE WITH CATALYTIC CONVERTER/COMPLETE SYSTEM .

Fig 6: Identifying Screw

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Align tailpipe (1) centrally in rear apron.

Fig 7: Identifying Tailpipe

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Insert captive retainer (1) between rear muffler holder and clamping ring.

Tighten down screw (2) for rear muffler holder.

Tightening torque. See 18 31 6AZ  in 18 31 EXHAUST PIPE WITH CATALYTIC CONVERTER/COMPLETE SYSTEM .

Tighten down clamping ring screw (3).

Tightening torque. See 18 31 7AZ  in 18 31 EXHAUST PIPE WITH CATALYTIC CONVERTER/COMPLETE SYSTEM .

Connect vacuum hose (4).

Fig 8: Identifying Captive Retainer, Rear Muffler Holder Screw, Clamping Ring Screw And Vacuum Hose

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