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 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 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).

Fig 2: Identifying 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 Chain Tensioner and 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 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: Exploded View of Chain Tensioner Assembly
Courtesy of BMW OF NORTH AMERICA, INC.

Installation Note:

Replace All Gaskets and Sealing Rings.

Assemble Engine.