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

WARNING: This page is about a different car, the 2005 BMW Z4, 2004 BMW Z4, and 2003 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Spring pressure!

Unfasten cylinder for chain tensioning piston.

Installation:

Replace sealing ring.

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

Fig 1: Unfastening Chain Tensioning Piston

Courtesy of BMW OF NORTH AMERICA, INC.

Arrangement of components:

Cylinder for chain tensioning piston
Sealing ring
Spring
Piston

Fig 2: Identifying Chain Tensioning Piston Parts
Courtesy of BMW OF NORTH AMERICA, INC.