11 36... Replacing screw connection on VANOS gear (N55)
Special tools required:
- 2 333 991
- 0 418 185
Aluminum screws/bolts must be replaced each time they are released.
Joining torque and angle of rotation must be observed without fail (risk of damage).
In ideal conditions, screw temperature and component temperature are identical.
Maximum permissible difference between aluminum screw and VANOS gearbox 20°C.
Necessary preliminary tasks:
- Remove cylinder head cover.
Replies aluminum screws in sequence (1 to 4).
For this, the engine must be rotated at the central bolt by 360° at a time.
Mark all replaced aluminum screws with a colored mark.
Turn the engine at the central bolt until the screw (1) of the intake adjuster is accessible (see illustration).
Maximum temperature difference 20°C.
Release aluminum screw (1) with special tool 2 333 991 or 0 418 185.
Use commercially available brake cleaner to remove all oil from the thread and thoroughly blow it out using compressed air.
Install new aluminum screw (1).
Adjust special tool 2 333 991 or 0 418 185 to the screw connection 6 Nm join and 65° angle of rotation (pay attention to any instructions/information provided by the special tool manufacturer).
Secure aluminum screw (1).
Turn the engine at the central bolt until the screw (1) of the exhaust camshaft adjuster is accessible (see illustration).
Maximum temperature difference 20°C.
Release aluminum screw (1) with special tool 2 333 991 or 0 418 185.
Use commercially available brake cleaner to remove all oil from the thread and thoroughly blow it out using compressed air.
Install new aluminum screw (1).
Adjust special tool 2 333 991 or 0 418 185 to the screw connection 6 Nm join and 65° angle of rotation (pay attention to any instructions/information provided by the special tool manufacturer).
Secure aluminum screw (1).
Turn the engine at the central bolt again for further dismantling and installation of the remaining aluminum screws.
Assemble engine.