11 31 051 Replacing timing chain

Special Tools Required: 

• 11 2 000
• 11 8 250
• 11 8 300
• 11 8 370

Necessary Preliminary Tasks: 

• Unscrew all spark plugs. Refer to 12 12 011 REPLACING ALL SPARK PLUGS .
• Remove cylinder head cover. Refer to 11 12 000 REMOVING AND INSTALLING/SEALING CYLINDER HEAD COVER (W10) .
• Remove pulse generator on camshaft. Refer to 12 14 537 REPLACING CAMSHAFT PULSE GENERATOR .
• Remove hydraulic chain tensioner. Refer to 11 31 091 REMOVING AND INSTALLING OR REPLACING HYDRAULIC CHAIN TENSIONER .
• Remove timing chain cover. Refer to 11 14 122 REMOVING AND INSTALLING / REPLACING TIMING CHAIN COVER (W10/W11) .
• Remove left engine mounting. Refer to 22 11 001 REPLACING RIGHT ENGINE MOUNT .

Fit special tool 11 8 370 on cylinder block (1) and engine mounting (2).

Fig 1: View Of Support Arm On Cylinder Block

Courtesy of BMW OF NORTH AMERICA, INC.

Release camshaft retaining bolt (1) and hold camshaft gear with special tool 11 8 250.

Unscrew plugs (2).

Fig 2: Locating Camshaft Retaining Bolt

Courtesy of BMW OF NORTH AMERICA, INC.

Unscrew retaining bolt for camshaft gear, then remove gear wheel and chain.

Remove camshaft gear from timing chain.

Unscrew retaining bolts (1) of chain guides and remove both guides (2).

Fig 3: Removing Chain Guides

Courtesy of BMW OF NORTH AMERICA, INC.

Installation Note: 

If the timing chain is replaced, the camshaft gear and crankshaft gear must also be replaced.

Remove crankshaft gear using special tool 11 8 300 together with 11 2 000.

Fig 4: Removing Crankshaft Gear Using Special Tools

Courtesy of BMW OF NORTH AMERICA, INC.

Installation Note: 

Shrink-fit crankshaft gear (1) onto crankshaft.

Check correct position of locating pin (2).

Use a hotplate to heat crankshaft gear to a maximum temperature of 150° C. 

Fig 5: Fitting Crankshaft Gear Onto Crankshaft

Courtesy of BMW OF NORTH AMERICA, INC.

Install timing chain.

Install clamping rail and guide rail (2).

Install retaining screws (1) of chain guides.

Tightening torque: 11 12 12AZ in ENGINE - TIGHTENING TORQUES- COOPER (1.6L) R50/W10 .

Place timing chain on camshaft gear.

Fit camshaft gear onto camshaft.

Fit central bolt for camshaft gear.

Tightening torque, refer to 11 12 5AZ in ENGINE - TIGHTENING TORQUES- COOPER (1.6L) R50/W10 .

Fig 6: Installing Clamping Rail, Guide Rail And Chain Guides

Courtesy of BMW OF NORTH AMERICA, INC.

Installation Note: 

Triangular adjustment mark (1) on camshaft gear must be aligned with copper-colored timing chain links (2).

Fig 7: Identifying Copper-Colored Timing Chain Links

Courtesy of BMW OF NORTH AMERICA, INC.

Installation Note: 

The two triangular adjustment marks (1) on crankshaft gear must be aligned with copper-colored timing chain links (2).

Fig 8: Aligning Adjustment Mark With Timing Chain Links

Courtesy of BMW OF NORTH AMERICA, INC.

1. Camshaft adjustment mark lines up with colored chain link.
2. Camshaft gear.
3. Left timing chain guide.
4. Right timing chain guide.
5. Tensioning device for timing chain.
6. Crankshaft gear.
7. Chain.
8. Crankshaft adjustment mark lines up with the two colored chain links.
   Fig 9: Identifying Camshaft/Crankshaft Gear And Left/Right Timing Chain Guide

   Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.