11 31 025 Removing and installing/replacing exhaust camshaft (M57T2)

Necessary preliminary tasks:

Remove protective cap in direction of arrow.

Installation:

Reinstall protective cap with some grease.

Fig 1: Removing Protective Cap

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Crank engine at central bolt.

Secure crankshaft at flywheel with special tool 11 6 080.

Fig 2: Securing Crankshaft On Flywheel Using Special Tool (11 6 080)

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Position (1) of inlet camshaft gear flush with cylinder head.

Position (2) of exhaust camshaft gear flush with cylinder head.

Fig 3: Identifying Positions Of Inlet And Exhaust Camshaft Gear

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Evenly release bolts of camshaft bearing caps A1 to A7 in 1/2 turn steps from outside to inside.

Remove exhaust camshaft in direction of arrow.

Fig 4: Removing Exhaust Camshaft

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NOTE: Worn rockers may only be reused on the same grooves of the camshaft.

Fig 5: Identifying Oil Camshaft Bearings And Bearing Caps

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IMPORTANT: These screws must "not" be removed.

Fig 6: Caution For Removing Screws

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NOTE: E Inlet camshaft

A Exhaust camshaft

Fig 7: Identifying Inlet And Exhaust Camshafts

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Insert exhaust camshaft.

Position (1) of inlet camshaft gear flush with cylinder head.

Position (2) of exhaust camshaft gear flush with cylinder head.

If necessary, resecure camshafts.

Fig 8: Identifying Positions Of Inlet And Exhaust Camshafts

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

See illustration.

Fig 9: Identifying Markings On Inlet And Exhaust Camshaft

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The exhaust camshaft bearing covers are marked A 1... A 7 from the exhaust side.

Oil all bearing points.

Fit bearing covers.

Insert all bolts and initially tighten without play.

Tighten down exhaust camshaft bearing caps in 1/2 turn increments evenly from inside to outside.

Fig 10: Tightening Exhaust Camshaft Bearing Caps

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Cams of both camshafts must point to top right.

Place special tool 11 6 321 on exhaust camshaft.

Secure special tool 11 6 321 with special tool 11 6 322.

Installation

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

Fig 11: Placing Special Tool (11 6 321) On Exhaust Camshaft

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Secure special tool 11 6 254 to cylinder head with bolts (1).

NOTE: See illustration.

Fig 12: Securing Special Tool (11 6 254) To Cylinder Head With Bolts

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Check exhaust camshaft axial clearance.

Set up special tool 11 6 252 with dial gauge.

Refer to TECHNICAL DATA

NOTE: Illustration shows inlet camshaft.

Procedure for exhaust camshaft is identical.

Fig 13: Checking Exhaust Camshaft Axial Clearance

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If necessary, adjust VALVE TIMING .

Assemble engine.