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.

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

Courtesy of BMW OF NORTH AMERICA, INC.