11 31 025 Replacing intake camshaft (N57 Diesel)

Special tools required: 

• 11 5 320 .
• 11 6 480 .
• 11 8 760 .

Necessary preliminary work: 

• Remove CYLINDER HEAD COVER .
• Remove ENGINE SPLASH GUARD .

Crank engine with special tool 11 6 480 to TDC firing position of first cylinder.

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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Release CHAIN TENSIONER  (1).

Fig 3: Identifying Chain Tensioner

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Release screws (1).

Remove camshaft sprockets from camshaft and feed out of timing chain.

Secure timing chain against falling out.

Fig 4: Identifying Camshaft Bolts

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Remove 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: Identifying Bearing Caps

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Moisten all bearing positions (1) with engine oil.

Check installation position of roller cam followers (2) (risk of damage.)  .

Check all engine oil feed bores (3) for cleanness.

Fig 6: Identifying Roller Cam Follower, Bearing Position, And Engine Oil Feed Bore

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

Fig 7: Identifying Intake Camshaft Mark

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The marks on both camshafts (A and E) must agree when installing intake camshaft (E) (see Fig 8).

Fig 8: Identifying Camshaft Sprockets

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Install intake camshaft.

Tighten bearing caps E1 to E7 by 1/2 a turn at a time on the camshaft carrier, working from the inside outwards.

Tightening torque: 11 31 2AZ .

Fig 9: Identifying 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).

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.

Fig 12: Identifying Special Tool (11 8 760)

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Marks on both camshafts (A and E) must agree (be aligned) (see Fig 13).

Fig 13: Identifying Camshaft Sprockets

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Tighten camshaft bolts (1).

Tightening torque: 11 31 1AZ .

Fig 14: Identifying Camshaft Bolts

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Remove all special tools.

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

Check CAMSHAFT ADJUSTMENT .

Fig 15: Identifying Special Tool (11 6 480)

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Assemble engine.