13 53 175 Removing and Installing/Replacing All Pressure Lines (N73)

Special tools required: 

• 13 0 131 
• 13 0 132 
• 13 0 133 

Necessary preliminary tasks: 

• Remove intake air manifold.  See 11 61 050 REMOVING AND INSTALLING INTAKE AIR MANIFOLD (N73)

Recycling: 

Fuel escapes when fuel lines are detached.

Catch and dispose of escaping fuel.

Observe country-specific waste-disposal regulations.

Remove pressure sensors  (1 to 6 and 7 to 12). See 13 53 567 REPLACING FUEL PRESSURE SENSOR (N73) 

Fig 1: Identifying Drain Tube And Special Tool (13 0 132) & (13 0 133)

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Screw in special tool 13 0 132. 

Connect special tool 13 0 133  drain tube (1) to special tool 13 0 132. 

Disconnect fuel feed line (1).

Connect special tool 13 0 131  to fuel feed line (1).

Drain fuel with compressed air (2) carefully  from fuel feed line, cylinders 1 to 6.

Screw in pressure sensors 1 to 6 again.

Follow the same procedure for cylinders 7 to 12.

Fig 2: Identifying Fuel Feed Line & Special Tool (13 0 131)

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Release high pressure lines (1 and 6).

Release return lines (3).

Tightening torque: 13 53 6AZ  See 13 53 FUEL INJECTION NOZZLES AND PIPES

Detach high-pressure line (7).

Tightening torque: 13 53 7AZ  See 13 53 FUEL INJECTION NOZZLES AND PIPES

Release holders (2, 4 and 5).

Fig 3: Identifying High Pressure Lines, Return Lines & Holder

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Tighten high-pressure lines (2) with a ring wrench (1).

Tightening torque: 13 53 1AZ  . See 13 53 FUEL INJECTION NOZZLES AND PIPES

Tightening torque: 13 53 2AZ  . See 13 53 FUEL INJECTION NOZZLES AND PIPES

Tightening torque: 13 53 3AZ  . See 13 53 FUEL INJECTION NOZZLES AND PIPES

Fig 4: Identifying Lines & Line Wrench

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Assemble engine.

Check fuel lines for leaks.