Detach compressed air line from VANOS tandem actuator -4-.
Attention: After releasing the plugs, oil begins to flow out. Prepare clean rags and a container. Wipe off any oil on rubber parts immediately.
Unscrew the plugs -1- located along the axis of the intake and exhaust camshafts and collect the escaping oil.
Using short pliers, grasp and pull out the caps -2- under the plugs.
Unscrew guide pins -3- located under caps.
Attention: Left-hand thread, turn to the right to loosen.
Sprocket device for VANOS
1 - pulse sensor disk
2 - disc spring
3 - adjusting washer 3.5 mm thick
4 - slotted roller
5 - asterisk
6 - slotted head bolt
7 - slotted sleeve
8 - asterisk
9 - bolt with pin
10 - exhaust camshaft
11 - shaft disk
12 - slotted roller
13 - asterisk
14 - bolt with pin
15 - adjusting washer
16 - pulse sensor disk
17 - intake camshaft
Clean the sealing surfaces of the VANOS mechanism from dirt and oil.
Screw on -arrows- BMW special tool 11 6 150 -1-. With the help of this device, splined bushings are locked when removing the sprockets.
Tighten 3 nuts -2- and -3- on both sprockets to 5 Nm each, do not overtighten the nuts.
Tighten bolts -4- in recesses to 22 Nm.
Tighten nuts -2- and -3- to 22 Nm.
Loosen the fastening of the special tool from BMW 11 V 150.
Apply Drei Bond 1209 or Loctite Ultra Black to sealing surfaces between cylinder head and VANOS tandem actuator.
Replace the VANOS tandem actuator seal with a new one. Screw on actuator -arrows-. Tighten the M6 nuts to 10 Nm and the M8 nuts to 22 Nm.
Connect plug to VANOS tandem actuator.
Screw guide pins into intake and exhaust camshafts.
Attention: Left hand thread, so turn to the left.
Replace the caps installed under the plugs with new ones and insert into place with pliers.
Screw plugs into intake and exhaust camshafts with new gaskets and tighten to 50 Nm.
Screw on the front eye for hanging the engine.
Remove the camshaft and crankshaft locking tools, see drawings W-1057 and W-10308 above.
Connect the compressed air line to the VANOS tandem actuator using a suitable adapter and supply air at a pressure of 2-8 bar, see figure W-10224 above.
By supplying compressed air to the actuator, turn the crankshaft in the direction of rotation (clockwise) at least 2 turns.
Place the engine crankshaft in a position in which the piston of cylinder 1 is at TDC, while the tops of the intake and exhaust camshafts for cylinder 1 (from the side of the camshaft drive chain) should be equally directed upwards.
Re-insert the crankshaft locking pin, see drawing W-1057 above.
Reinstall the camshaft locking tool, see illustration W-1030B on page 13.
Attention: The camshaft locking tool on the intake side can rise up to one mm. If the device is located higher on the exhaust side, then it is necessary to adjust the valve timing of the engine by turning the camshaft sprockets. To do this, the fastening of the sprockets must be released, the sprockets should be deployed, and then the fastening should be tightened again with a torque of 22 Nm.
Remove the camshaft locking tool.
Remove the compressed air adapter from the VANOS actuator. Screw the pressure oil line with a new seal to the actuator and tighten the fastener to 30 Nm. Connect the plug.