11 28 010 Replacing alternator drive belt (N54)

Special tools required: 

• 11 3 340 

See ENGINE - SPECIAL TOOLS (N54, N63) .

Necessary preliminary tasks: 

• Remove fan cowl  . See 17 11 035 REMOVING AND INSTALLING/REPLACING FAN COWL WITH ELECTRIC FAN (N54) .

Unfasten hose clip (1).

Release quick-connect fastener (3) 90° on boost pressure pipe in direction of arrow.

Pull off air hose (2).

Installation: 

Bring lock (3) back 90° into installation position.

Recirculated air hose must audibly snap into place.

Fig 1: Identifying Hose Clip, Air Hose And Quick-Connect Fastener

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Unclip line (1) from holder (2) in direction of arrow.

Fig 2: Identifying Line And Holder

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Release coolant hose (1) from holder (2).

Fig 3: Identifying Coolant Hose And Holder

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Release screw (1).

Fold air duct (2) down.

Fig 4: Identifying Screw And Air Duct

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Turn belt tensioner (1) in direction of arrow until bore is flush on housing.

Secure belt tensioner in place with special tool 11 3 340  .

Fig 5: Identifying Belt Tensioner And Special Tool 11 3 340

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Remove drive belt (1).

Installation: 

Mark the direction of rotation of the drive belt if it is to be reused.

Fig 6: Identifying Drive Belt

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Pretension tensioning pulley (1) in direction of arrow.

Remove special tool 11 3 340  .

Fig 7: Identifying Tensioning Pulley

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Installation: 

Note arrangement of drive belt

Fig 8: Identifying Drive Belt Routing

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Assemble engine.

Installation: 

Risk of damage! 

Check that drive belt is in correct installation position.

Belt drive system E71 

Fig 9: Identifying Drive Belt Routing (E71)

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