Variable Valve Timing Solenoid: Service and Repair

11 36 655 - Removing and installing/replacing both solenoid valves (N54)





Important!
Always check that the solenoid valves are clean during removal and installation.
Possible malfunctions if valves are contaminated:
- Rough running
- OBD incorrect entry
- Poor exhaust gas values
- Low engine power

Important!
Risk of damage!
Do not clean solenoid valves with compressed air.





Necessary preliminary tasks:
- Read out fault memory in DME control unit
- Switch off ignition
- Remove fan cowl Service and Repair





Note:
Carefully press coolant hose and pressure line (not shown) to one side.

Note:
Solenoid valve (2) controls the inlet adjustment unit.
Solenoid valve (3) controls the exhaust adjustment unit.

Remove plug connections (1 and 4).

Installation Note:
Do not mix up plug connections (1 and 4) of solenoid valves.
Plug connections (1 and 4) must snap audibly into place!





Unfasten screws (3 and 4).
Tightening torque 11 36 3AZ Mechanical Specifications.
Carefully pull out solenoid valves (1 and 2).





Installation Note:
Replace sealing ring (1) on solenoid valve (2).

Note:
Moisten sealing ring (1) with engine oil.

Avoid damaging, e.g. notches or scratches, the solenoid valve (2).





Important!
Risk of damage!
Do not tilt solenoid valves (1 and 2) when inserting into cylinder head.

Carefully insert solenoid valves (1 and 2) up to stop.

Ensure correct installation position.
Insert screws (3 and 4) and tighten down.
Tightening torque 11 36 3AZ Mechanical Specifications.





Assemble engine.
Now clear the fault memory.
Check function of DME control unit.