13 53 240 Replacing complete injection pipe (N52/N52K)

Special tools required: 

• 13 5 281  . See FUEL SYSTEM - SPECIAL TOOLS .

Necessary preliminary tasks: 

• Read out fault memory of DME control unit
• Switch off ignition
• Remove clean air pipe  . See 64 31 053 REMOVING AND INSTALLING OR REPLACING FRESH AIR DUCT .
• Remove ignition coil cover  . See 11 00 REMOVING AND INSTALLING/REPLACING ACOUSTIC COVER (N52/N52K) .

Recycling 

Fuel escapes when fuel line is detached. Catch and dispose of escaping fuel.

Observe country-specific waste-disposal regulations.

N52K only: 

Unclip plug connection (1) from holder (2) and disconnect.

Unclip wiring harnesses from holder (2) and connector strip (3).

Disconnect holder (2) from injection pipe.

Fig 1: Identifying Plug Connection And Holder

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Remove protective cap from compressed air valve.

Fig 2: Locating Dust Cap

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Connect compressed air line (1) to compressed air valve.

Blow fuel back into tank with a short blast of compressed air (max. 3 bar).

Fig 3: Identifying Compressed Air Line

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Unlock and detach fuel line (1).

Detach connector strip (2) in direction of arrow.

Release screws.

Tightening torque 13 53 1AZ  . See FUEL SYSTEM - TIGHTENING TORQUES .

Remove injection pipe (3).

Fig 4: Detaching Connector Strip

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Seal fuel hose with special tool 13 5 281  . See FUEL SYSTEM - TIGHTENING TORQUES .

Lever out retainers (1).

Pull fuel injectors out of injection pipe.

Fig 5: Identifying Special Tool (13 5 281)

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Installation: 

Replace sealing rings on fuel injectors and coat with anti-friction rubber coating.

Fig 6: Identifying Retainers

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