11 31 091 Removing and installing/replacing hydraulic chain tensioner (COOPER S)

Special tools required: 

• 33 2 140

Turn off ignition.

Disconnect battery. Refer to 61 21 010 REMOVING AND INSTALLING BATTERY (COOPER S) .

Remove inspection cover. Refer to 11 12 000 Removing and installing, sealing cylinder head cover (COOPER S)  .

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

Remove timing chain tensioner plug (1) and tensioner.

Fig 1: Removing Timing Chain Tensioner Plug And Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

Install hint: 

Reset timing chain tensioner to the transit position.

Fig 2: Resetting Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

Place the tensioner (1) on a flat surface.

Remove tensioner reservoir cap (2).

Place the palm of your hand against the tensioner, with continuous pressure until the tensioner is fully compressed.

Refit tensioner reservoir cap (2) after reset.

Install hint: 

Check/replace sealing ring of tensioner plug.

Fig 3: Installing Timing Chain Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

Install the timing chain tensioner (1) into its housing and tighten.

Tightening torque 11 12 6AZ. Refer to ENGINE - TIGHTENING TORQUES .

Ensure the timing chain is properly positioned within the channel of the timing chain guides.

Do not lever directly on chain. Damage to the timing chain may occur.

Install hint: 

Using special tool 33 2 140, lever on the right (movable) timing chain guides until the timing chain tensioner ratchets out to tension the chain.

Fig 4: Tensioning Chain

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 5: Positioning Of Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.