Preload timing chain

Install a new chain tensioner

Replace sealing ring (1).
Parts: Sealing ring

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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
Chain tensioner piston M22x1.5	Angle of rotation	30°

Courtesy of BMW OF NORTH AMERICA, INC.