Variable Valve Timing Solenoid: Service and Repair

Removing and installing hydraulic valve

Removing the hydraulic valve
Preliminary work: The rear spoiler and the heat shields must be removed.





1. Remove the side heat shields on the relevant side of the vehicle.
2. Disconnect the connecting hose between the air cleaner and the charge air cooler. To do so, lever out the retaining clip on the top of the charge air cooler and pull the hose out.





3. Pull the lower connecting hose off the charge air cooler. To do so, lever the retaining clip out and pull the hose downwards.





4. Undo the front fastening. Unscrew the fastening nut and the two fastening screws.





5. Undo the bolts on the heat shield. Undo the two sheetmetal nuts on the lower end of the heat shield. Then press the heat shield out of the studs.
6. Undo the rear fastening. Unscrew the fastening nut and the fastening screw.
7. Remove charge air cooler.
8. Remove heat shield. To do so, unscrew the two upper fastening nuts.
9. Remove the cover panel. Unscrew the cover panel located above the plug coils.





10. Remove the adjacent plug coils. Unscrew the two hexagon socket head bolts for this purpose. Pull out the plug coils and hang them to one side.





11. Remove the fastening plate of the switch-over valve. To do so, unscrew the two hexagon-head bolts and remove the plate.
12. Remove the switch-over valve. To do so, disconnect the electric plug. Press the sheetmetal braces of the plug and pull the plug out at the same time. Then pull the switch-over valve out of the cylinder head.

Warning: Take care of the coil spring! During removal and installation, make sure that the coil spring is present and does not remain in the camshaft housing.





View of the valve





Installing the hydraulic valve

1. Replace O-ring. Replace the O-ring on the hydraulic valve.





2. Press the hydraulic valve into place. Insert the hydraulic valve into the camshaft housing and press it firmly into place. Place the retaining cover in place.
Pay attention to the cut-out on the fastening arm.

Note:
^ In order to make it easier to position the hydraulic valve, a socket with an extension of wrench size 20 may be used.





3. Position the two fastening screws and screw them in evenly. Tighten screws to 10 Nm (7.5 ft. lbs.)





4. Install the plug coils. Place the adjacent plug coils on the spark plugs again. Tighten the two fastening screws to 10 Nm (7.5 ft. lbs.).
5. Install heat shield. Tighten the two fastening screws to 10 Nm (7.5 ft. lbs.).





6. Reinstall the shield of the exhaust system. Tighten the two fastening nuts on the side member for this purpose.
7. Install charge air cooler. To do so, place the charge air cooler back in the vehicle.





8. Tighten the front two fastening nuts and the fastening screw in the wheel well, all to 23 Nm (17 ft. lbs.).
9. Tighten the front fastening nut and the fastening screw to 23 Nm (17 ft. lbs.). Supply the two hose connections on the charge air cooler with new O-rings and fit them in place. The connections must audibly engage.





10. Tighten the two sheetmetal nuts on the heat shield.





Fit rear spoiler again.

Location Thread Tightening torque Nm (ft. lbs.)
Heat shield on camshaft cover M6 10 (7.5)
Plug coils M6 x 25 10 (7.5)
Fastening screws on the switch-over valve M6 x 25 10 (7.5)
Fastening screws on the charge air cooler M8 23 (17)
Fastening nuts on the charge air cooler M8 23 (17)