11 31 094 Removing hydraulic chain tensioner for timing chains on left side (S63)

WARNING: This page is about a different car, the 2013 BMW X5 M, 2012 BMW X5 M, 2011 BMW X5 M, and 2010 BMW X5 M. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

11 9 900

WARNING: Chain tensioner is pre-tensioned.
Release lock pin only in installed state.
Risk of injury!

IMPORTANT: Risk of damage!
The engine must not be cranked when the chain tensioner is removed.
The timing chain may jump.

Necessary preliminary tasks:

Remove TIMING CASE COVER at top left.

Crank engine back at central bolt (1) against direction of engine rotation by approx. 90°.

Fig 1: Cranking Engine Back At Central Bolt

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: The timing chain on the chain tensioner becomes the tight end on cranking back.
Do not crank engine without chain tensioner or special tool 11 9 900 .

Piston (1) of chain tensioner must be pressed in against oil pressure in housing (see arrow).

Fig 2: Pressing Piston Of Chain Tensioner Against Oil Pressure In Housing

Courtesy of BMW OF NORTH AMERICA, INC.

If the chain tensioner piston is retracted over its full length, a 3.5 mm drill bit or a suitable lock pin must be positioned.

Fig 3: Identifying Lock Pin

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque 11 31 5AZ .

Remove chain tensioner (2).

Fig 4: Identifying Chain Tensioner And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Risk of injury!
Chain tensioner is under high preload force.

Chain tensioner arrangement:

Piston
Expansion element
Compression spring
Housing

Fig 5: Identifying Piston, Expansion Element, Compression Spring And Housing
Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Replace all gaskets and sealing rings.

Assemble engine.