The harmonic balancer, also known as the front pulley, requires the removal of the engine compartment splash shield and the engine accessory belt. For manual transmission, mount BMW special tool 11 8 180 on the transmission using bolts A, then slide the lock handle up and tighten bolt B. For automatic transmission, secure the flywheel with BMW special tool 11 8 660 through the transmission bell housing opening. After removing fasteners (1 to 8), the harmonic balancer can be taken out. It is crucial not to remove the harmonic balancer hub bolt, as doing so allows the timing chain drive sprocket to rotate freely, which can lead to valve damage. Installation follows the reverse order of removal.