Variable Valve Timing Actuator: Service and Repair

WM 153719 Removing and installing solenoid hydraulic valve (camshaft timing)

Tools





Technical values





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.

1. Disconnect cable plug on hydraulic valve -1- by pressing the clip and pulling off the cable plug.





Solenoid hydraulic valve for camshaft timing

2. Unscrew two M6 x 20 inner Torx screws -2- at the valve holder and remove the holder along with the screws.





Holder for solenoid hydraulic valve for camshaft timing

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.

3. 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

4. Remove retainer plate with integrated seal -1- from the valve.





Installation position of retainer plate for solenoid hydraulic valve for camshaft timing

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.

5. Check the valve body for damage in the sealing area of the retainer plates. If necessary, the valve must be replaced.
6. Pull the oil strainer -1- out of the cylinder head bore using a bar magnet. Clean using solvent naphtha, check for damage and soiling, and replace if necessary. Pay attention to the installation position.





Oil strainer hydraulic valve NVS

Installing hydraulic valve for camshaft timing

1. Using a bar magnet, fit a cleaned or new oil strainer into the cylinder bore -1-. Pay attention to the installation position.





Oil strainer hydraulic valve NVS

Information

- Replace O-ring on hydraulic valve and retainer plate with seal.

- Observe installation position of the hydraulic valve.

2. Replace O-ring on the hydraulic valve and coat 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. Lightly coat seal of retainer plate with engine oil and slide it over the hydraulic valve.





Installation position of retainer plate for solenoid hydraulic valve for camshaft timing

4. Position two M6 x 20 inner Torx screws complete with holder -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 valve for camshaft timing

5. Push cable plug onto the hydraulic valve. Make sure that the plug engages audibly.