Variable Valve Timing Actuator: Service and Repair

11 36 010 - Removing and installing/replacing double VANOS adjustment unit (M52TU/M54/M56)





Special tools required:
- 00 9 250 00 9 250 Torque Wrench with Flexible Extension
- 11 2 300 11 2 300 Plug Mandrel
- 11 3 240 11 3 240 Locking Fixture
- 11 3 450 11 3 450 Compressed Air Connection
- 11 4 220 11 4 220 Chain Tensioner
- 11 6 170 11 6 170 Pliers for Twin VANOS





Necessary preliminary tasks:
- Remove intake filter housing with air-mass flow sensor
- Remove fan impeller with fan clutch and fan cowl
- E60: Remove fan cowl with electric fan Service and Repair
- Remove cylinder head cover Service and Repair
- Remove spark plugs Service and Repair





E85 only:
- Remove radiator cover
- Drain coolant from radiator

Note:
Protect drive belt against emerging coolant.
- Remove right coolant hose

- Remove solenoid valve Replacing Solenoid Valve for Exhaust Side on VANOS Adjustment Unit for exhaust side





Removal:
Removal of double VANOS adjustment unit is described separately from installation. Assembly sequence for removal and installation is different.





Detach plastic cover for inlet camshaft.





Unscrew oil pressure pipe.





Mount special tool 11 3 450 11 3 450 Compressed Air Connection with banjo bolt of oil pressure line.





Important!
Cover double VANOS adjustment unit.
When the compressed air supply is connected, several drops of oil are sprayed out of the bore.





Connect compressed air (2 to 8 bar).





Note:
When the engine is switched off, it is possible that the camshafts are not in their initial positions. With the compressed air supply connected, rotate the engine to return the camshafts to their initial positions.

With compressed air supply connected, crank engine at least two revolutions in direction of rotation until cam tips on inlet and exhaust camshafts on 1st cylinder face each other.





Pull dust guard out of the special tool bore.





Secure crankshaft in firing TDC position with special tool 11 2 300 11 2 300 Plug Mandrel.

Important!
Remove special tool 11 2 300 11 2 300 Plug Mandrel before switching on the engine.





Automatic transmissions only:
Illustration does not show automatic transmission.

Important!
On engines with automatic transmissions, there is shortly before the special tool bore (1) a large bore (2) which can be confused with the special tool bore.

If special tool 11 2 300 is secured in the correct bore (1), the engine can no longer be cranked at the central bolt.





Unscrew studs.





Secure camshafts with special tool 11 3 240 11 3 240 Locking Fixture.





Detach compressed air connection.

Note:
special tool 11 3 450 11 3 450 Compressed Air Connection still remains fitted.





Important!
Oil escapes after screw plugs have been removed. Have cleaning cloths and container ready.
Make sure no oil runs onto belt drive. Remove any remnants of oil immediately with cleaning cloth.

Remove screw plugs, catch escaping oil on inlet and exhaust sides.





Remove sealing caps with special tool 11 6 170 11 6 170 Pliers for Twin VANOS or with commercially available short flat nose pliers.
E85:
Use commercially available offset flat nose pliers.





Important!
Left-hand threads.

Release fitting screws on inlet and exhaust sides.





Detach plug connections from camshaft sensor and solenoid valves on exhaust and inlet sides.





Unscrew suspension eye.





Release nuts and remove double VANOS adjustment unit.





Important!
With double VANOS adjustment unit removed:
Do not crank engine.
The toothed shaft on the inlet side may move and slip out of the spline teeth, the inlet camshaft is thus no longer non-positively connected and the valves could rest on the piston.





Installation:
Installation of double VANOS adjustment unit is described separately from removal. Assembly sequence for removal and installation is different.





Check dowel sleeves (1) for damage and correct installation position.
Keep sealing faces clean and free of oil. Apply a thin and even coat of sealing compound Drei Bond 1209 (refer to BMW Parts Service) to contact surface edges of separating face between cylinder head and double VANOS adjustment unit.
Replace seal.





Install and secure double VANOS adjustment unit.





Attach plug connections of camshaft sensor and solenoid valves on exhaust and inlet sides.





Important!
Left-hand threads.

Insert fitting screws for hydraulic piston on toothed shaft on inlet and exhaust sides and tighten down.

Tightening torque 11 36 4AZ 11 36 Variable Camshaft Control VANOS.





Replace sealing caps and install with special tool 11 6 170 11 6 170 Pliers for Twin VANOS or with commercially available short flat nose pliers.
E85:
Use commercially available offset flat nose pliers.





Insert screw plugs with new sealing rings and tighten down.
Tightening torque 11 36 3AZ 11 36 Variable Camshaft Control VANOS.





Fit suspension lug.





Note:
If the double VANOS adjustment unit has been replaced, you must check and, if necessary, adjust the camshaft timing.
If work has been carried out which has "no" effect on the timing and it is assured that the timing adjustment is correct, the timing check described in the following does not"" have to be conducted.





Important!
Cylinder for chain tensioning piston is under spring pressure.

Remove cylinder for chain tensioning piston.





Insert special tool 11 4 220 11 4 220 Chain Tensioner in cylinder head and bring adjustment screw into contact with tensioning rail.





Preload tensioning rail with special tool 11 4 220 11 4 220 Chain Tensioner by rotating adjusting screw with special tool 00 9 250 00 9 250 Torque Wrench with Flexible Extension or standard torque wrench to 0.7 Nm.





Pull special tool 11 2 300 11 2 300 Plug Mandrel back until flywheel is no longer secured in position.





Remove special tool 11 3 240 11 3 240 Locking Fixture.





Important!
Cover double VANOS adjustment unit; when the compressed air supply is connected, several drops of oil are sprayed out of the bore.





Connect compressed air (2 to 8 bar).





With compressed air supply connected, crank engine twice in direction of rotation until cam tips on inlet and exhaust camshafts on 1st cylinder face each other.





Secure crankshaft with special tool 11 2 300 11 2 300 Plug Mandrel in TDC position of 1st cylinder.

Important!
Do not turn the engine back.
Remove special tool 11 2 300 11 2 300 Plug Mandrel before switching on the engine.





Check camshaft setting:
Fit special tool 11 3 240 11 3 240 Locking Fixture to camshafts.





Note:
The timing is correctly set if the special tool 11 3 240 11 3 240 Locking Fixture rests without a gap on the cylinder head or protrudes up to 1 mm to the inlet side.
The timing must be reset if the special tool 11 3 240 11 3 240 Locking Fixture protrudes to the exhaust side.

If necessary, adjust camshaft timing Adjustments.





Detach compressed air connection.
Remove special tool 11 3 450 11 3 450 Compressed Air Connection.





Fit oil pressure line with new seals.
Tightening torque 11 36 2AZ 11 36 Variable Camshaft Control VANOS.





Unfasten and remove special tool 11 4 220 11 4 220 Chain Tensioner.





Install cylinder for chain tensioning piston Service and Repair.





Remove special tool 11 3 240 11 3 240 Locking Fixture.





Remove special tool 11 2 300 11 2 300 Plug Mandrel.
Assemble engine.