11 31 505 Adjusting valve timing (M57T2)

Necessary preliminary tasks:

The cams on the inlet camshaft at the 1st cylinder point downwards.

Release screw (1).

NOTE: Bolt (1) must be removed beforehand as it is no longer accessible in TDC position.

Tightening torque, see 11 31 1AZ in 11 31 CAMSHAFT .

Fig 1: Identifying Inlet Camshaft Bolts

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Remove protective cap in direction of arrow.

Installation:

Reinstall protective cap with some grease.

Fig 2: Removing Protective Cap

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Crank engine at crankshaft with special tool 11 6 480.

Secure crankshaft at flywheel with special tool 11 6 080.

Fig 3: Securing Crankshaft On Flywheel Using Special Tool (11 6 080)

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IMPORTANT: Do not release screws (2).
Release sprocket wheel bolts (1).
Tightening torque, see 11 31 1AZ in 11 31 CAMSHAFT .

Fig 4: Identifying Sprocket Wheel Bolts

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Marking (1) on inlet camshaft must be flush with cylinder head.

Marking (2) on exhaust camshaft must be flush with cylinder head.

It is possible to effect turning at the hexagon head of the exhaust camshaft in order to adjust the gear wheels.

NOTE: See illustration.

Fig 5: Identifying Marking On Inlet And Exhaust Camshaft

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Marking (1) on inlet camshaft gear must be between markings (2) on exhaust camshaft gear.

NOTE: See illustration.

Fig 6: Identifying Marking On Inlet Camshaft Gear And Exhaust Camshaft Gear

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Position special tool 11 6 321 on inlet camshaft and secure with special tool 11 6 322.

Installation:

The exhaust camshaft only has to be checked, adjustment is not possible.

Fig 7: Securing Inlet Camshaft Using Special Tool (11 6 332)

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Secure sprocket wheel bolts (1).

Tightening torque, see 11 31 1AZ in 11 31 CAMSHAFT .

Installation:

Crank engine at central bolt through 360°.

The third sprocket wheel bolt is now accessible.

Secure third sprocket wheel bolt.

Fig 8: Identifying Sprocket Wheel Bolts

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Check timing.

Remove all special tools.

Assemble engine.