11 31 090 Removing and installing/replacing chain tensioning piston (M52 / M52TU / M54 / M56)

WARNING: This page does not describe the selected car, but rather 33 other vehicles, including the 2006 BMW 325Ci, 2005 BMW 325xi, 2005 BMW 325i, 2005 BMW 325Ci, and 2004 BMW 325xi. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Spring pressure!

Unfasten cylinder for chain tensioning piston.

Fig 1: Identifying Cylinder For Chain Tensioning Piston

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Replace sealing ring.

Tightening torque, refer to 11 31 8AZ in ENGINE - TIGHTENING TORQUES .

Arrangement of components:

Cylinder for chain tensioning piston
Sealing ring
Spring
Piston

Fig 2: Identifying Sealing Ring And Spring
Courtesy of BMW OF NORTH AMERICA, INC.