11 31 052 Replacing both timing chains (N63)

Special tools required: 

• 00 2 300 
• 11 2 001 
• 11 2 002 
• 11 2 003 
• 11 2 007 

See MAINTENANCE AND GENERAL INFORMATION - SPECIAL TOOLS .

See ENGINE - SPECIAL TOOLS (N54, N63) .

Necessary preliminary tasks: 

• Remove lower timing case cover  
• To facilitate removal and installation of timing chains, turn engine over with special tool 00 2 300.

Timing drive, cylinders 1 to 4  .

Remove guide rail (5) from bearing bolt.

Remove timing chain (3) with tensioning rail (4) from bearing bolt.

Timing drive, cylinders 5 to 8  .

Remove guide rail (1) from bearing bolt.

Remove timing chain (2) with tensioning rail (6) from bearing bolt.

Fig 1: Identifying Guide Rail, Timing Chain And Tensioning Rail

Courtesy of BMW OF NORTH AMERICA, INC.

Timing drive, cylinders 1 to 4  .

Release bearing bolts (2) with a suitable tool.

Tightening torque: 11 31 1AZ.11 31 CAMSHAFT

Timing drive, cylinders 5 to 8  .

Release bearing bolts (1).

Fig 2: Identifying Bearing Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

Attach special tools 11 2 001 and 11 2 002 to crankshaft.

Insert special tool 11 2 007 and remove sprocket wheel with special tool 11 2 003.

Installation: 

Check sprocket wheels for wear, replace if necessary.

Heat sprocket wheel to 60°C  .

Fig 3: Removing Sprocket Wheel With Special Tool

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Make sure Woodruff key (1) is installed in correct position in crankshaft (2).

Fig 4: Identifying Woodruff Key And Crankshaft

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Maintain tension of timing chains when installing timing case cover.

Observe sparking protection on timing case cover.

Make sure timing chain (1) is correctly installed when placing it in guide rail (3).

Assemble engine.