Variable Valve Timing Solenoid: Service and Repair
WM 153719 Removing and installing solenoid hydraulic valve (camshaft timing)
Removing hydraulic valve for camshaft timing
Removing hydraulic valve for camshaft timing
Caution:
Risk of oil contamination and blocked oil bores
Faulty engine parts, engine damage
- Absolute cleanliness is essential when working on hydraulic valves.
Information:
The rear silencer must be removed and the holder must be detached before the hydraulic valve on cylinder side 4 - 6 can be removed.
1. Cylinder side 4 - 6 only: Remove rear silencer.
2. Cylinder side 4 - 6 only: Remove holder for rear silencer. Unscrew two M8 x 30 Torx screws on the intake side and two M8 x 25 screws on the exhaust side and remove the holder.
Holder for rear silencer
3. Remove the side shield on the relevant side of the engine. To do this, unscrew the two M6 x 16 Torx screws -arrows-.
Removing and installing shield
4. Disconnect cable plug on hydraulic valve -1- by pressing the clip and pulling off the cable plug.
Camshaft timing valve
5. Unscrew two M6 x 20 inner Torx screws -2- at the valve holder and remove the holder along with the screws -A-.
Holder for solenoid hydraulic valves
Information:
Handle the hydraulic valve with care; do not turn it at the valve tip or at the safety contact.
A seal against leaks cannot be ensured if there is damage in the area of the retainer plate, therefore handle the pliers indicated with care.
6. Carefully pull the hydraulic valve out of the cylinder head using special tool relay puller 9235. Before using the puller, mask the valve body in fabric tape in order to prevent slippage or damage.
Pulling out hydraulic valve with relay puller
7. Remove retainer plate with integrated seal -1- from the valve.
Retainer plate with seal - installation position of valve for camshaft timing and valve lift control
Information:
Handle the hydraulic valve with care; do not turn it at the valve tip or at the safety contact.
A seal against leaks cannot be ensured if there is damage in the area of the retainer plate, therefore handle the pliers indicated with care.
8. Check the valve body for damage in the sealing area of the retainer plates. If necessary, the valve must be replaced.
9. Pull the oil strainer with bar magnet out of the cylinder head bore. Clean using solvent naphtha, check for damage and soiling, replace if necessary. Pay attention to the installation position.
Oil strainer for hydraulic valve for camshaft timing
Installing hydraulic valve for camshaft timing
Installing hydraulic valve for camshaft timing
1. Fit cleaned or new oil strainer with bar magnet into the cylinder bore -1-. Pay attention to the installation position.
Oil strainer for hydraulic valve for camshaft timing
Information:
Replace O-ring on hydraulic valve and retainer plate with seal.
Observe installation position of the hydraulic valve.
2. Replace the O-ring of the hydraulic valve and coat the new O-ring with engine oil. Insert hydraulic valve into the cylinder head. Pay attention to installation position while doing this. The groove on the valve -arrow- points to the dowel pin in the cylinder head.
Groove on valve for camshaft timing
Position of dowel pin in cylinder head
Dowel pin for valve for camshaft timing
3. Coat seal of the retainer plate with engine oil and slide it over the hydraulic valve.
4. Position two M6 x 20 inner Torx screws complete with support -A- on the valve and tighten the screws. Observe installation position of the cable terminal (to intake distributor). - Tightening torque: 7.5 ftlb.
Holder for solenoid hydraulic valves
5. Push cable plug onto the hydraulic valve. Make sure that the plug engages audibly.
6. Fit the side shield to the relevant side of the engine. To do this, insert and tighten the two M6 x 16 Torx screws -arrows-. - Tightening torque: 7.5 ftlb.
Removing and installing shield
Information:
The clamp between the rear silencer and the catalytic converter must be replaced.
7. On cylinder side 4 - 6, fit the holder for the rear silencer and re-install the rear silencer. - Tightening torque: 17 ftlb.; - Tightening torque: 17 ftlb.; - Tightening torque: 33 ftlb.; - Tightening torque: 17 ftlb. ; - Tightening torque: 22 ftlb.