BMW 7 Series: Removing And Installing/Renewing Inlet And Exhaust Adjustment Units On Left Side (N63)

Notes

IMPORTANT: When the engine is shut down, the inlet and exhaust camshaft adjuster is normally locked in its initial position.

The central bolts is greased from engine number 20024296.

(cylinder bank 5 to 8)

Necessary preliminary work

• Read fault memory and make a documentary record
• Remove LEFT CYLINDER HEAD COVER
• Remove LEFT TIMING CASE COVER
• Check timing

To release central bolts, use special tool 11 9 890 or grip at hexagon head of camshaft.

Fig. 343: Identifying Special Tool 11 9 890

IMPORTANT: If special tool 11 9 890 can not be fitted, it is necessary when releasing the central bolt to grip the hexagon head of the respective camshafts.

Release central bolts (1 and 2) of intake and exhaust camshaft adjusters.

Installation note: Replace central bolts after releasing.

Fig. 344: Identifying Central Bolts Of Intake And Exhaust Camshaft Adjusters

IMPORTANT: Check whether head of central bolt (1) is greased (see arrow).

If no grease can be seen on the bolt head of central bolt (1), the intake and exhaust camshaft adjuster must be renewed due to safety reasons.

Installation note: Coat contact face of central bolt (1) with copper paste.

Fig. 345: Checking Head Of Central Bolt

Release hexagon socket screw.

Release special tool 11 9 900 at knurled screws and remove.

Fig. 346: Preloading Hexagon Socket Screw With Special Tool 00 9 250 To 0.6 Nm

Release screws (1).

Remove upper tensioning rail (2).

NOTE: Shown without special tools for purposes of clarity.

Fig. 347: Identifying Upper Tensioning Rail And Screws

Remove central bolt (2) of inlet adjustment unit.

Installation note: Replace central bolts after releasing.

Fig. 348: Identifying Central Bolts Of Intake And Exhaust Camshaft Adjusters

Detach inlet adjustment unit (1) in direction of arrow from inlet camshaft.

Fig. 349: Identifying Inlet Adjustment Unit

Feed out inlet adjustment unit (2) from timing chain (1).

Lift out inlet adjustment unit (2).

Fig. 350: Identifying Inlet Adjustment Unit And Timing Chain

Remove central bolt (1) of exhaust adjustment unit.

Installation note: Replace central bolts after releasing.

Fig. 351: Identifying Central Bolts Of Intake And Exhaust Camshaft Adjusters

Detach exhaust adjustment unit (1) in direction of arrow from exhaust camshaft.

Fig. 352: Identifying Exhaust Adjustment Unit

Feed out exhaust adjustment unit (2) from timing chain (1).

Lift out exhaust adjustment unit (2).

Fig. 353: Identifying Exhaust Adjustment Unit And Timing Chain

IMPORTANT: Danger of mix-up:

Intake and exhaust camshaft adjusters are different.

Mixing up the inlet and exhaust adjustment units will cause damage to the engine.

1. Intake camshaft adjuster (1) is marked IN
2. Exhaust camshaft adjuster (2) is marked OUT

Fig. 354: Identifying Intake And Exhaust Camshaft Adjusters Mark

Installation note: Coat contact face of central bolt (1) with copper paste.

Fig. 355: Checking Head Of Central Bolt

NOTE: Position of adjustment units in relation to timing chain can be freely selected.

Feed adjuster into timing chain and position on camshafts.

Insert central bolts (1 and 2) on adjustment units without gaps.

Release central bolts (1 and 2) by 90º.

Fig. 356: Identifying Central Bolts Of Intake And Exhaust Camshaft Adjusters

Fit sliding rail (2) and secure with screws (1).

Tightening torque: 11 31 4AZ.

Fig. 357: Identifying Sliding Rail And Screws

Get set of special tools 11 9 890 ready for securing camshafts.

Fig. 358: Identifying Set Of Special Tools 11 9 890

Place special tool 11 9 893 on exhaust camshaft.

Fig. 359: Identifying Special Tool 11 9 893 On Exhaust Camshaft

Fit special tool 11 9 893 on intake camshaft.

Fig. 360: Identifying Special Tool 11 9 893 On Intake Camshaft

Installation note: Align exhaust and intake camshafts so that special tools 11 9 893 lie on the cylinder head without any gap.

Screw special tool 11 9 894 into cylinder head.

Fig. 361: Positioning Special Tool 11 9 893 On Intake Camshaft And Exhaust Camshaft

Press special tool 11 9 892 down with special tool 11 9 891.

Fig. 362: Positioning Special Tool 11 9 892 On Special Tool 11 9 893

Screw in special tool 11 9 900.

Pretension timing chain with special tool 11 9 900.

Preload hexagon socket screw with special tool 00 9 250 to 0.6 Nm.

Fig. 363: Preloading Hexagon Socket Screw With Special Tool 00 9 250 To 0.6 Nm

Check special tools 11 9 190 for correct seating.

Fig. 364: Securing Vibration Damper With Special Tool 11 9 190

Tighten down central screw (1 and 2) of the adjustment units with special tool 00 9 120.

Tightening torque 11 36 1AZ.

Fig. 365: Identifying Central Bolts Of Intake And Exhaust Camshaft Adjusters

Remove special tools 11 9 190 and 11 8 570.

Crank engine at central bolt twice in direction of rotation until engine is in the 150º firing TDC position cylinder 1 again.

Mount special tool 11 8 570 on vibration damper with a bolt.

Secure special tool 11 9 190 in 150º firing TDC position cylinder 1.

Fig. 366: Securing Vibration Damper With Special Tool 11 9 190

Check timing again. Remove all special tools.

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