11 31 052 Replacing both timing chains (N63O1)

WARNING: This page is about a different variant/trim than selected.

Special tools required:

WARNING: Burning hazard! Wear gloves and safety goggles!

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.

Graphic N63.

Fig 1: Identifying Timing Chains, Guide Rails, And Tensioning Rails

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Bearing bolts (1 and 2) are microencapsulated and should not be released.

Installation note:

Install new bearing bolts when replacing crankcase.

Fig 2: Identifying Bearing Bolts

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 .

Timing drive, cylinders 5 to 8.

Release bearing bolts (1).

Tightening torque: 11 31 2AZ .

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 60 °C.

Fig 3: Removing Sprocket Wheel

Courtesy of BMW OF NORTH AMERICA, INC.

WARNING: Burning hazard! Wear gloves.

Installation note:

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

Heat sprocket wheel to 60 °C .

Quickly slide headed camshaft sprocket on crankshaft.

Cooling down makes the camshaft sprocket shrink-fit on crankshaft (2).

Fig 4: Identifying Crankshaft And Woodruff Key

Courtesy of BMW OF NORTH AMERICA, INC.

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.