Special tools required:

• 11 2 001. See 11 2 000 PULLER
• 11 2 002. See 11 2 000 PULLER
• 11 2 003. See 11 2 000 PULLER
• 11 2 007. See 11 2 000 PULLER

Necessary preliminary tasks: 

• Remove lower timing case cover. See 11 14 110 Removing and Installing Lower Timing Case Cover (N73) 

Remove timing chain (1).

Remove timing chain (5).

Loosen screws (7).

Remove guide rails (3 and 6).

Remove tensioning rails (2 and 4).

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

Courtesy of BMW OF NORTH AMERICA, INC.

Attach special tools 11 2 001 and 11 2 002 to crankshaft. See11 2 000 PULLER

Insert special tool 11 2 007 and remove sprocket wheel with special tool 11 2 003. See 11 2 000 PULLER

Fig 2: Identifying Special Tools (11 2 001 And 11 2 002) On Crankshaft

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Installation: 

Check sprocket wheels for wear, replace if necessary.