Cylinders 5 - 8

Necessary preliminary tasks:

Remove left cylinder head cover
Remove fan cowl with electric fan. See 17 11 035 REMOVING AND INSTALLING/REPLACING FAN COWL WITH ELECTRIC FAN (N63) .
Remove belt pulley for A/C system. See.
Remove left chain tensioner

Mount special tool 11 9 900 at position of chain tensioner.

Preload hexagon socket screw with special tool 00 9 25 to 0.6 Nm .

NOTE: Graphic corresponds to cylinders 1-4.

Fig 1: Identifying Hexagon Socket Screw With Special Tool

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Marking (MP = Mounting Position) is important for installing special tool 11 8 570.

MP = 150° before cylinder no. 1 firing TDC position .

Fig 2: Identifying MP Mark On Vibration Damper

Courtesy of BMW OF NORTH AMERICA, INC.

Position special tool 11 8 570 with dihedron on vibration damper in such a way that it can be secured with bolt (1) at the MP marking.

NOTE: Setting groove on crankcase, see arrow.

Fig 3: Positioning Special Tool On Vibration Damper

Courtesy of BMW OF NORTH AMERICA, INC.

Crank engine at central bolt.

Secure vibration damper with special tools 11 8 570 and 11 9 190 at 150° before cylinder no. 1 firing TDC position .

Fig 4: Identifying Special Tools Position (11 8 570 And 11 9 190)

Courtesy of BMW OF NORTH AMERICA, INC.

With cylinder no. 1 at 150° before firing TDC position, cams on exhaust camshaft (A) at cylinder no. 5 point at an angle to the left.

Cams on inlet camshaft (E) point at an angle downwards.

NOTE: For purposes of clarity, the graphic shows the inlet and exhaust adjustment units removed.

Fig 5: Identifying Inlet And Exhaust Camshaft

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IMPORTANT: When the engine is shut down, the inlet and exhaust adjustment units are normally locked in their initial position.

The situation may arise in some individual cases where this initial position is not reached and the camshaft can continue to be rotated in the adjustment range of the adjustment unit.

In order to avoid incorrect timing adjustment, it is essential to check the locking of the adjustment unit and if necessary perform locking by rotating the camshafts.

Checking locking of inlet and exhaust adjustment units in initial position:

Gripping hexagon head (2) of camshafts with a fork wrench (1), carefully try to rotate camshafts against direction of rotation.

The inlet and exhaust adjustment units are locked in the initial position when the camshafts are non-positively connected to the adjustment units.

Fig 6: Grip Hexagon Head With Fork Wrench

Courtesy of BMW OF NORTH AMERICA, INC.

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.

Fit special tool 11 9 893 on exhaust camshaft and check timing adjustment.

NOTE: Timing is correctly adjusted when special tool 11 9 893 rests without a gap on cylinder head.

Fig 7: Identifying Special Tool 11 9 893 On Exhaust Camshaft

Courtesy of BMW OF NORTH AMERICA, INC.

Fit special tool 11 9 893 on inlet camshaft and check timing adjustment.

NOTE: Timing is correctly adjusted when special tool 11 9 893 rests without a gap on cylinder head.

If necessary, adjust camshaft timing on left side.

Fig 8: Identifying Special Tool On Cylinder Head

Courtesy of BMW OF NORTH AMERICA, INC.

Remove all special tools.

Assemble engine.