11 31 505 Adjusting timing of camshafts (N47)

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Special tools required:

Necessary preliminary tasks:

Remove CYLINDER HEAD COVER

Crank engine at central bolt with special tool 11 6 480

IMPORTANT: Do not turn the engine against the direction of travel .

Fig 1: 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: 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.

NOTE: See Fig 3.

Fig 3: Camshafts Part Number

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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 4: Camshaft Points

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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 5.
The exhaust camshaft must be removed if the marks do not agree (are not aligned).

Fig 5: Exhaust Sprocket Wheel Marking

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Release all bolts of bearing caps A1 to A5 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 6: Bearing Caps

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Release chain tensioner (1).

Tightening torque: 11 12 2AZ .

Fig 7: Chain Tensioner

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Remove camshaft bolts (1) and detach camshaft sprocket.

Tightening torque: 11 31 1AZ .

Fig 8: 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 9.

Fig 9: Exhaust Sprocket Wheel Marking

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Tighten all bearing caps A1 to A5 working from the inside outwards.

Tightening torque: 11 31 2AZ .

Fig 10: Bearing Caps

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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).

Tighten bolts (1) to 10 Nm.

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

Fig 11: Bolts

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Install chain tensioner (1).

Tightening torque: 11 12 3AZ .

Fig 12: 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 13: Placing Special Tool (11 8 760) On Exhaust Camshaft

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Tighten down screws (1).

Tightening torque: 11 31 1AZ .

Fig 14: Screws

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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 turn the engine back .

Fig 15: 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.