11 36 048 Removing And Installing/Replacing Inlet And Exhaust VANOS On Right Side (N73)

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NOTE:

For Special Tool identification, see ENGINE- SPECIAL TOOLS .

Special Tools Required:

11 9 190
11 9 460
11 9 461
11 9 462
11 9 463

Cylinders 1 to 6.

Necessary Preliminary Tasks:

Read fault memory and make a documentary record.
Remove right cylinder head cover. Refer to 11 12 006 REMOVING AND INSTALLING/SEALING RIGHT CYLINDER HEAD COVER (N73) .
Remove spark plugs. Refer to 12 12 011 REPLACING ALL SPARK PLUGS (N73) .
Remove vacuum pump. Refer to 11 66 000 REMOVING AND INSTALLING/REPLACING VACUUM PUMP (N73) .
Remove right VANOS solenoid valves. Refer to 11 36 720 REMOVING AND INSTALLING/REPLACING BOTH SOLENOID VALVES ON RIGHT SIDE (N73) .
Remove right timing case cover. Refer to 11 14 085 REMOVING AND INSTALLING TOP RIGHT TIMING CASE COVER (N73) .

Crank engine at central bolt in direction of rotation to firing TDC position of 1st cylinder.

Secure vibration damper with special tool 11 9 190 in firing TDC position of 1st cylinder.

NOTE: Special tool bore as (N62).

Fig 1: Securing Vibration Damper With Plug Mandrel

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: With 1st cylinder in firing TDC position, cams of inlet and exhaust camshafts at 1st cylinder point towards each other at an angle.

Fig 2: Identifying 1st Cylinder Inlet And Exhaust Camshafts Cam Position

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IMPORTANT: Screw (1) must not be replaced by an M8 screw (special screw) .

Unscrew bolt (1).

Unclip oil line (3) from retainers (2) and remove.

Fig 3: View Of Oil Line In Retainer

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IMPORTANT: The adjustment units are locked in an initial position when the engine is switched off. In individual cases this initial position is not achieved and the camshaft remains rotatable in the VANOS adjustment range. In order to avoid incorrect timing adjustment, it is necessary to check the locking of the VANOS and if necessary perform locking by rotating the camshafts.

Locking Check (Inlet):

Engage hexagon head of camshaft at front and rotate inlet camshaft carefully against direction of rotation.

The inlet VANOS is locked in the initial position when the inlet camshaft is non-positively connected to the inlet VANOS.

Fig 4: Inlet Locking Check

Courtesy of BMW OF NORTH AMERICA, INC.

Locking Check (Exhaust):

Engage hexagon head of exhaust camshaft at front and rotate exhaust camshaft carefully in direction of rotation.

The exhaust VANOS is locked in the initial position when the exhaust camshaft is non-positively connected to the exhaust VANOS.

Fig 5: Exhaust Locking Check

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IMPORTANT: If the inlet or exhaust adjustment unit of the camshafts "cannot" be locked as described, the adjustment unit is faulty and must be replaced.

Slacken screws of inlet and exhaust VANOS.

NOTE: When slackening screws, grip camshafts at hexagon head.

Fig 6: View Of Inlet And Exhaust VANOS Screws

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Remove screw from inlet VANOS (1).

Vigorously press back tensioner rail (3) several times to remove oil in chain tensioner.

Feed out and remove inlet VANOS (1).

Fig 7: Locating Screw For Inlet VANOS

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Remove screw from exhaust VANOS (2).

Feed out and remove exhaust VANOS (2).

Secure timing chain to prevent it from sliding down.

The removal work finishes at this point.

Fig 8: Identifying Screw From Exhaust VANOS

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IMPORTANT: Danger Of Mixing Up Adjustment Units.

The inlet and exhaust adjustment units are different.

Mixing up the adjustment units will result in engine damage .

The inlet VANOS (1) is identified with EIN and IN.
The exhaust VANOS (2) is identified with AUS and EX.

NOTE: The exhaust VANOS of cylinder bank 1 to 6 also has a metal clip for the vacuum pump drive.

Fig 9: Identifying Inlet And Exhaust VANOS

Courtesy of BMW OF NORTH AMERICA, INC.

Feed exhaust VANOS (2) into timing chain and fit onto exhaust camshaft.

Installation:

Position of exhaust VANOS (2) in relation to timing chain can be freely selected.

Fig 10: Inserting Exhaust VANOS Into Timing Chain

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Replace screw.

Tighten screw without play and then slacken off again by half a turn.

Fig 11: View Of Exhaust VANOS Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Feed inlet VANOS (1) into timing chain. Press back tensioning rail (3) then place on inlet camshaft.

Installation:

Position of inlet VANOS (1) can be freely selected.

Remove chain tensioner if tensioning rail (3) cannot be pressed back.

Compress chain tensioner slowly and carefully.

Repeat procedure twice, reinstall chain tensioner and tighten down.

Installation:

Tightening torque for chain tensioner, refer to 11 31 8AZ in ENGINE - TIGHTENING TORQUES .

Replace sealing ring.

Fig 12: Inserting Inlet VANOS Into Timing Chain (Right)

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Replace screw.

Tighten screw without play and then slacken off again by half a turn.

Fig 13: View Of Inlet VANOS Screw

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Get special tool 11 9 460 ready for securing camshafts.

NOTE: Special tool 11 9 461 for securing inlet camshaft.
Special tool 11 9 462 for securing exhaust camshaft.
Special tool 11 9 463 (holder with screw).

Fig 14: Identifying Inlet And Exhaust Camshaft Guide And Holder

Courtesy of BMW OF NORTH AMERICA, INC.

Place special tool 11 9 461 on inlet camshaft.

Installation:

Place special tool 11 9 461 flat on cylinder head, align inlet camshaft if necessary.

Fig 15: Installing Guide On Inlet Camshaft

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Fit special tool 11 9 463, insert screw (1) in thread for oil line and secure special tool 11 9 461 in position.

Tighten down special tool 11 9 463 by hand.

Fig 16: View Of Guide And Holder

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Tighten down screw (1) of inlet adjustment unit.

Installation:

Tightening torque, refer to 11 36 16AZ in ENGINE - TIGHTENING TORQUES .

When tightening down screw (1), grip inlet camshaft at hexagon head.

Fig 17: Tightening Inlet Adjustment Unit Screw

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Release screw (1), remove special tools 11 9 463 and 11 9 461 from inlet camshaft.

Fig 18: Removing Guide And Holder From Inlet Camshaft

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Place special tool 11 9 462 on exhaust camshaft.

Installation:

Place special tool 11 9 462 flat on cylinder head, align exhaust camshaft if necessary.

Fig 19: Installing Guide On Exhaust Camshaft

Courtesy of BMW OF NORTH AMERICA, INC.

Fit special tool 11 9 463, insert screw (1) in thread for oil line and secure special tool 11 9 462 in position.

Tighten down special tool 11 9 463 by hand.

Fig 20: Identifying Guide And Holder

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Tighten down screw (2) of exhaust VANOS.

Installation:

Tightening torque, refer to 11 36 16AZ in ENGINE - TIGHTENING TORQUES .

When tightening down screw (2), grip exhaust camshaft at hexagon head.

Fig 21: Locating Exhaust VANOS Screw

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Release screw (1), remove special tools 11 9 463 and 11 9 462 from inlet camshaft.

Fig 22: View Of Guide And Holder On Inlet Camshaft

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Remove special tool 11 9 190.

Crank engine at central bolt twice in direction of rotation until engine returns to firing TDC position of 1st cylinder.

Secure vibration damper with special tool 11 9 190 in firing TDC position of 1st cylinder.

Fig 23: Removing Plug Mandrel From Vibration Damper

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Fit special tools 11 9 461 and 11 9 462 again for checking purposes and check valve timing.

NOTE: The timing is correctly adjusted when special tools 11 9 461 and 11 9 462 rest flat on the cylinder head or protrude by up to 0.5 mm to the exhaust side.

Remove all special tools.

Assemble engine.