11 31 095 Removing hydraulic chain tensioner for timing chains on right side (S63)

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Special tools required:

11 4 120 .

WARNING: Chain tensioner is pre-tensioned.
Release lock pin only in installed state.
Danger 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 right

IMPORTANT: The timing chain on the chain tensioner becomes the tight end on cranking back.
Do not turn engine without chain tensioner.

Retract the entire length of the piston (2) of the chain tensioner (1).

Tightening torque: 11 31 5AZ .

Fig 1: Identifying Piston Of Chain Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

The piston of the chain tensioner must be pressed in against oil pressure in housing (see arrow).

Secure piston with special tool 11 4 120 .

Unfasten screws (2 and 3).

Tightening torque 11 31 5AZ .

Remove chain tensioner (1).

Fig 2: Securing Piston Using Special Tool 11 4 120

Courtesy of BMW OF NORTH AMERICA, INC.

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

Chain tensioner arrangement:

Piston
Expansion element
Compression spring
Housing

Fig 3: Identifying Compression Spring, Expansion Element, Piston, And Housing
Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Replace all gaskets and sealing rings .

Assemble engine.