11 31 052 Replacing Both Timing Chains (N73)

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NOTE:

For Special Tool identification, see ENGINE- SPECIAL TOOLS .

Special Tools Required:

11 2 001
11 2 002
11 2 003
11 2 007

Necessary Preliminary Tasks:

Remove lower timing case cover. Refer to 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: Removing Timing Chain

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.

Fig 2: Attaching Special Tools To Crankshaft

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Installation:

Check sprocket wheels for wear, replace if necessary.