Variable Valve Timing Solenoid: Service and Repair

Removal/Installation (Armature and Solenoid)





- Unbolt solenoid (Y49), bolt on.
- Coat solenoid (Y49) sealing surface with sealant 002 989 47 20 10.
- Tighten M6 x 16 bolts (1).
- Remove front upper front cover, install, refer to Replacement. Service and Repair
- Unscrew armature (4) with M5 x 11 bolt (3), screw on.
Counter-hold armature (4) at flats (arrow) for this step
See table below for tightening torque
Armature (4) can be fitted onto control plunger (18) only in fixed position (arrow).

CAUTION: It is not permitted to re-use the bolt (3).

NOTE: The armature (4) together with the control plunger (18) must move freely from stop to stop after the nut (6) has been tightened to the specified torque of 65 Nm.

CAUTION: For operational reasons, the different versions of the armature (4) and of the solenoid (2) must only be installed in the specified combination (see table below for matching).

Matching Armature And Solenoid

Matching Armature And Solenoid (Part 1 Of 2):

Matching Armature And Solenoid (Part 2 Of 2):

Tightening Torque Table
- Bolt of armature to control plunger
1st version 1) bolt + washer: 7 Nm
2nd version 2) collar bolt: 5 Nm + Tightening angle 90°
- Bolts of solenoid to front cover: 10 Nm

Footnotes
1) Replace with 2nd version when performing repairs
2) Use only once