11 31 094 Removing hydraulic chain tensioner for timing chains on left side (N63)

Special tools required:

11 9 900 .

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 work:

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

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

Chain tensioner arrangement:

Piston
Expansion element
Compression spring
Housing

Fig 5: 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.