11 31 091 Removing and installing or replacing hydraulic chain tensioner

Special Tools Required: 

• 33 2 140

Switch off ignition.

Disconnect battery. Refer to 12 00 DISCONNECTING AND CONNECTING BATTERY .

Remove inspection hole cover. Refer to 11 12 000 REMOVING AND INSTALLING/SEALING CYLINDER HEAD COVER (W10) .

Remove right front wheel. Refer to 36 10 300 REMOVING OR INSTALLING FRONT OR REAR WHEEL .

Remove wiring harness bracket (1), remove screw plug (2) for timing chain tensioner and remove clamping fixture.

Fig 1: Removing Screw Plug Of Timing Chain Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Move timing chain tensioner back into transition position.

Place clamping fixture (1) on a level surface.

Remove cap (2) from clamping fixture.

Lay hand surface against clamping fixture and exert continuous pressure until clamping fixture is completely compressed.

Refit cap (2) on clamping fixture after resetting.

Fig 2: Resetting Clamping Fixture

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Check/replace sealing ring of screw plug for clamping fixture.

Mount timing chain tensioner (1) in housing and tighten down.

Tightening torque, 11 12 6AZ in ENGINE - TIGHTENING TORQUES- COOPER (1.6L) R50/W10 .

Fig 3: Mounting Timing Chain Tensioner In Housing

Courtesy of BMW OF NORTH AMERICA, INC.

Make sure timing chain is correctly arranged inside channel of timing chain guides.

Do not lever directly at the chain. This can damage the timing chain.

Installation: 

Using special tool 33 2 140 lever at right (moving) timing chain guide until timing chain tensioner tensions chain.

Fig 4: Aligned Timing Chain Guide

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 5: Releasing Position Of Clamping Fixture

Courtesy of BMW OF NORTH AMERICA, INC.