11 36 047 Removing And Installing/Replacing Inlet And Exhaust VANOS On Left 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 7 to 12.

Necessary Preliminary Tasks:

Read fault memory and make a documentary record.
Remove left cylinder head cover. Refer to 11 12 005 REMOVING AND INSTALLING/SEALING LEFT CYLINDER HEAD COVER (N73) .
Remove spark plugs. Refer to 12 12 011 REPLACING ALL SPARK PLUGS (N73) .
Remove VANOS solenoid valves. Refer to 11 36 715 REMOVING AND INSTALLING/REPLACING BOTH SOLENOID VALVES ON LEFT SIDE (N73) .
Remove left timing case cover. Refer to 11 14 080 REMOVING AND INSTALLING TOP LEFT 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 Special Tool

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: With 1st cylinder in firing TDC position, cams of inlet and exhaust camshafts at 7th cylinder point upwards at an angle.

See Fig 2.

Fig 2: Identifying 7th Cylinder Inlet And Exhaust Camshafts Cam Position

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

Release screw (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 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 and exhaust VANOS 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 exhaust VANOS (2).

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

Feed out and remove exhaust VANOS (2).

Fig 7: Locating Screws From Exhaust VANOS

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Remove screw from inlet VANOS (1).

Feed out and remove inlet VANOS (1).

Secure timing chain to prevent it from sliding down.

The removal work finishes at this point.

Fig 8: Identifying Screws From Inlet VANOS

Courtesy of BMW OF NORTH AMERICA, INC.

Important!

Danger Of Mixing Up Adjustment Units.
Mixing up the adjustment units will result in engine damage.

The inlet and exhaust VANOS are different.

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

Fig 9: Identifying Inlet And Exhaust VANOS
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Feed inlet VANOS (1) into timing chain and fit onto inlet camshaft.

Installation:

Position of inlet VANOS (1) in relation to timing chain can be freely selected.

Fig 10: Inserting Inlet 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 Inlet VANOS Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Feed exhaust VANOS (2) into timing chain. Press back tensioning rail (3) then place on exhaust camshaft.

Installation:

Position of exhaust VANOS (2) 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 Exhaust VANOS Into Timing Chain

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Installation:

Replace screw.

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

Fig 13: Identifying Exhaust 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

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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: Installing Guide And Holder

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Tighten down screw (1) of inlet VANOS.

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: Locating Inlet VANOS Screw (Left)

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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 And Holder On Exhaust Camshaft

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

Tighten down special tool 11 9 463 by hand.

Fig 20: Installing 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: View Of Exhaust VANOS Screw

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 22: Removing Guide And Holder From 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: Identifying Plug Mandrel

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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.