11 31 094 Removing hydraulic chain tensioner for timing chains on left side (N74)

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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: Turning Central Bolt Approx. 90° Against Direction Of Engine Rotation

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 in illustration).

NOTE: Graphics show N63.

Fig 2: Pressing Chain Tensioner Piston

Courtesy of BMW OF NORTH AMERICA, INC.

Position special tool 11 4 120 or 3.5 mm drill in drill hole.

WARNING: Piston of chain tensioner is now secured.

Release screws (1).

Tightening torque: see 7AZ in 11 31 CAMSHAFT

Remove chain tensioner (2).

Fig 3: Removing Chain Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Risk of injury!

Chain tensioner is pre-tensioned.

Chain tensioner arrangement:

Piston
Expansion element
Compression spring
Housing

Fig 4: Identifying Chain Tensioner Components

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Replace all gaskets and sealing rings .

Assemble engine.