E53 (X5)
Pull special tool 11 5 180 back until flywheel is no longer secured in position.
Lift timing chain and hold under tension.
Crank engine against direction of rotation at central bolt into 45° before TDC position.
Remove special tools 11 2 444 / 11 2 443 / 11 2 441 / 11 2 445.
If necessary, machine open-end wrench accordingly.
Rotate exhaust camshaft at hexagon head until exhaust cam on cylinder 2 is facing upwards.
Rotate inlet camshaft at hexagon head until inlet cam on cylinder 1 is facing upwards.
Release bearing caps of exhaust and inlet camshafts on cylinder bank 1 to 4 in 1/2 turn increments uniformly from outside to inside.
Remove bearing covers on cylinder bank 1 to 4 and place to one side in order.
Lift out camshafts.
Crank engine from 45° before TDC position in direction of rotation up to TDC position.
Hold crankshaft in TDC position with special tool 11 5 180.
Install distributor on right camshaft adjustment unit.
Install right camshaft adjustment unit.
Install timing case covers at top left and top right.
Install chain tensioning piston.
Install both cylinder head covers.
Assemble engine.