Relaxing chain tensioner on bank 2 for checking or setting timing

NOTE: RISK OF DAMAGE
Damage to timing chain or timing chain drive .
Turning the engine without chain tensioner or special tool can result in damage to the timing chain and timing chain drive .

Always turn the engine with the chain tensioner or the special tool.

Make sure that the chain drive is loaded at the same time on the central bolt of the engine and on the VANOS exhaust central valve .
The movement of the chain tensioner piston must be observed in this process.
To do this, carry out the following steps at the same time:
Keep the VANOS central valve on the exhaust side under tension in clockwise direction with a support person.
The VANOS central valve on the exhaust side must not be twisted.

Courtesy of BMW OF NORTH AMERICA, INC.
Rotate the engine counterclockwise at the central bolt.

Courtesy of BMW OF NORTH AMERICA, INC.

Slackening the hydraulic chain tensioner of cylinder bank 2

NOTE: RISK OF DAMAGE
Damage to timing chain or timing chain drive .
Turning the engine without chain tensioner or special tool can result in damage to the timing chain and timing chain drive .

Always turn the engine with the chain tensioner or the special tool.

Courtesy of BMW OF NORTH AMERICA, INC.

Position the special tool 0 491 012 (11 4 120) (3) in the bore and fasten the chain tensioner piston.

Make sure that the chain drive is relieved at the same time on the central bolt of the engine and on the VANOS central valve on the exhaust side .
To do this, carry out the following steps at the same time:
Relieve the chain drive clockwise at the central bolt.

Courtesy of BMW OF NORTH AMERICA, INC.
Relieve the chain drive counterclockwise at the VANOS central valve on the exhaust side.

Courtesy of BMW OF NORTH AMERICA, INC.