11 31 505 Adjusting timing of camshafts (N57 Diesel)

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Special tools required:

Necessary preliminary tasks:

Remove underbody protection at front and rear. See UNDERBODY PROTECTION (FRONT) and UNDERBODY PROTECTION (REAR) .
Remove CYLINDER HEAD COVER .
Only all-wheel drive vehicles: Remove STIFFENING PLATE .

Crank engine at central bolt with special tool 11 6 480 .

IMPORTANT: Do not crank the engine back.
Special tool 11 6 480 must be removed before start-up of engine.

Fig 1: Identifying Special Tool (11 6 480)

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Remove protective cap of gear case cover.

Block crankshaft with cylinder no. 1 in TDC firing position with special tool 11 5 320 .

Fig 2: Securing Flywheel Using Special Tool (11 5 320)

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It must be possible to read the part number on the exhaust and intake camshafts (E and A) from above.

The cam on the intake camshaft (E) points obliquely upwards at cylinder No. 1.

The cam on the exhaust camshaft (A) points obliquely outward to the left at cylinder No. 1.

Fig 3: Identifying Cam Positions At Cylinder 1

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The marking on exhaust sprocket wheel (A) must be aligned with the marking on intake sprocket wheel (E).

NOTE: See Fig 4.
The exhaust camshaft must be removed if the marks do not agree (are not aligned).

Fig 4: Identifying Camshaft Sprockets

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Release all bolts of bearing caps A1 to A7 working from the outside inwards.

Tightening torque: 11 31 2AZ .

Remove exhaust camshaft in upward direction.

Place all components on special tool 11 4 480 in a tidy and orderly fashion.

Fig 5: Camshaft Bearing Strip Screws Tightening/Loosening Sequence

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Release CHAIN TENSIONER (1).

Tightening torque: 11 12 2AZ .

Fig 6: Identifying Chain Tensioner

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Remove camshaft bolts (1) and detach camshaft sprocket.

Tightening torque: 11 31 1AZ .

Fig 7: Identifying Camshaft Bolts

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Position intake camshaft (E).

Installation note:

Note installation position of roller cam follower.

Fit exhaust camshaft (A) in such a way that both marks are aligned.

NOTE: See Fig 8.

Fig 8: Identifying Camshaft Sprockets

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Tighten all bearing caps A1 to A7 working from the inside outwards.

Tightening torque: 11 31 2AZ .

Fig 9: Camshaft Bearing Strip Screws Tightening/Loosening Sequence

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Place the camshaft sprocket with timing chain on the intake camshaft such that bolts (1) are located in the center of the slots.

Insert bolts (1).

Join bolts (1) to 10 Nm.

Release bolts (1) again by a 90° turn.

Fig 10: Identifying Camshaft Bolts

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Install chain tensioner (1).

Tightening torque: 11 12 2AZ .

Fig 11: Identifying Chain Tensioner

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Place special tool 11 8 760 on exhaust camshaft.

NOTE: Special tool 11 8 760 must lie flush on cylinder head.

Fig 12: Identifying Special Tool (11 8 760)

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Tighten down screws (1).

Tightening torque: 11 31 1AZ .

Fig 13: Identifying Camshaft Bolts

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Crank engine twice in direction of rotation with special tool 11 6 480 up to TDC firing position of cylinder no. 1.

Check CAMSHAFT ADJUSTMENT .

IMPORTANT: Do not crank the engine back.

Fig 14: Identifying Special Tool (11 6 480)

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Assemble engine.

Turn over engine twice.

Check timing.

IMPORTANT: Special tool 11 5 320 must be removed before starting engine.