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

Installation: 

Replace sealing ring.

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

Fig 1: Unfastening Cylinder For Chain Tensioning Piston

Courtesy of BMW OF NORTH AMERICA, INC.

Arrangement of components:

1. Cylinder for chain tensioning piston
2. Sealing ring
3. Spring
4. Piston

Fig 2: Identifying Chain Tensioning Piston Assembly

Courtesy of BMW OF NORTH AMERICA, INC.