Preload timing chain

Install a new chain tensioner 

• Replace sealing ring (1)  .

  Parts:  Sealing ring

  Courtesy of BMW OF NORTH AMERICA, INC.

• Tighten chain tensioner using the illustrated tool.

  Courtesy of BMW OF NORTH AMERICA, INC.

• Tighten chain tensioner (1)  from below.
  TIGHTENING TORQUES SPECIFICATION
  
  

  Chain tensioner to cylinder head
  Chain tensioner piston M22x1.5	Joining torque	20 Nm
  	Angle of rotation	30°

  Courtesy of BMW OF NORTH AMERICA, INC.