BMW 7 Series: Replacing Both Timing Chains (N63)

Notes

WARNING: Burning hazard! Wear gloves.

Necessary preliminary work

• 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. 278: Identifying Guide Rail, Timing Chain And Tensioning Rail

Timing drive, cylinders 1 to 4

Release bearing bolts (2) with a suitable tool.

Tightening torque: 11 31 1AZ.

Timing drive, cylinders 5 to 8

Release bearing bolts (1).

Tightening torque: 11 31 2AZ.

Fig. 279: Identifying Bearing Bolts

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

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

Installation note: Check sprocket wheels for wear, replace if necessary.

Heat sprocket wheel to 60ºC.

WARNING: Burning hazard! Wear gloves.

Fig. 280: Removing Sprocket Wheel With Special Tool 11 2 003

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

Fig. 281: Identifying Woodruff Key Installed In Correct Position In Crankshaft

Installation note: 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.

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