11 31 025 Replacing intake camshaft (N47)

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Special tools required:

Necessary preliminary tasks:

REMOVE CYLINDER HEAD COVER .

Crank engine with special tool 11 6 480 to TDC firing position of cylinder no. 1.

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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Release chain tensioner (1).

Fig 3: Chain Tensioner

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Release screws (1).

Remove camshaft sprocket from the intake camshaft and feed out of timing chain.

Store timing chain in cylinder head.

Fig 4: Screws

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Remove intake camshaft.

NOTE: It is necessary to adjust the engine timing in order to remove the intake camshaft.

Release bearing caps E1 to E5 by 1/2 a turn at a time, working from the outside inwards.

Pull intake camshaft upwards to remove.

Fig 5: Bearing Caps

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Preparation for installation:

Oil all bearing positions (1).

Fig 6: Bearing Positions

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Check installation position of the roller cam followers (risk of damage!) .

Fig 7: Roller Cam Followers Installation Position

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Install intake camshaft.

Install intake camshaft (1) marked with (E).

Fig 8: Intake Camshaft Mark

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The marks on both camshafts (A and E) must agree when installing intake camshaft (E) (see Fig 9).

Fig 9: Exhaust Sprocket Wheel Marking

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Tighten bearing caps E1 to E5 by 1/2 a turn at a time on the camshaft carrier, 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 elongated holes.

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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Marks on both camshafts (A and E) must agree (be aligned) (see Fig 14).

Fig 14: Exhaust Sprocket Wheel Marking

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Tighten camshaft bolts (1).

Tightening torque: 11 31 1AZ .

Fig 15: 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 16: Special Tool (11 6 480)

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Assemble engine.