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

Necessary preliminary tasks:

REMOVING CYLINDER HEAD COVER

Crank engine at crankshaft with special tool 11 6 480.

The cams on the inlet camshaft at the 1st cylinder point downwards.

Release screw (1).

NOTE: Bolt (1) must be removed beforehand as it is no longer accessible in TDC position.

Sprocket wheel classification (0) value from 0 to 9

Tightening torque, see 11 31 1AZ in 11 31 CAMSHAFT .

Fig 1: Identifying Inlet Camshaft Bolts

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Undo plug in timing case cover at bottom.

Fig 2: Locating Plug On Timing Case Cover

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IMPORTANT: No piston is permitted to be in the TDC position risk of damage .
Crank engine back at crankshaft through 45°.

Turn exhaust camshaft at hexagon head in direction of arrow.

The hydraulic chain tensioner can be secured in place in this position with special tool 11 3 340.

NOTE: The hydraulic chain tension is forced back by rotating the exhaust and inlet camshafts.

Fig 3: Turning Exhaust Camshaft On Hexagon Head

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Lock hydraulic chain tensioner with special tool 11 3 340.

NOTE: If the sprocket wheel is removed without the hydraulic chain tensioner being locked, the chain tensioner piston will slip out and can then only be pressed back again with a considerable amount of effort.

Fig 4: Locking Hydraulic Chain Tensioner Using Special Tool (11 3 340)

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Remove protective cap in direction of arrow.

Installation

Reinstall protective cap with some grease.

Fig 5: Removing Protective Cap

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Crank engine at crankshaft with special tool 11 6 480.

Secure crankshaft at flywheel with special tool 11 6 080.

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

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Release sprocket wheel bolts (1).

Tightening torque, see 11 31 1AZ in 11 31 CAMSHAFT .

Release bearing pins (2) of guide rails.

Fig 7: Identifying Sprocket Wheel Bolts And Bearing Pins Of Guide Rails

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Release sprocket wheel with chain (1) from inlet camshaft in direction of arrow.

Release guide rail (2) from mounting and pull out in direction of arrow.

Fig 8: Releasing Sprocket Wheel With Chain From Inlet Camshaft

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Remove sprocket wheel (2) in direction of arrow to right from timing chain (3) and remove towards top.

Fig 9: Removing Sprocket Wheel

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Release bolts (1) of inlet camshaft bearing cap in 1/2 turn increments evenly from outside to inside.

NOTE: Illustration shows M57TU.

Fig 10: Releasing Bolts Of Inlet Camshaft Bearing Cap

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Remove bearing caps of inlet camshaft and lift out inlet camshaft (1).

All bearing caps are marked.

E = inlet camshaft.

A = exhaust camshaft.

Fig 11: Lifting Out Inlet Camshaft

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

Fig 12: Identifying Rockers

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IMPORTANT: These screws must "not" be removed.

Fig 13: Caution For Removing Screws

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NOTE: E Inlet camshaft
A Exhaust camshaft

Fig 14: Identifying Inlet And Exhaust Camshaft

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Insert inlet 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 15: Identifying Positions Of Inlet And Exhaust Camshaft Gears

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

See illustration.

Fig 16: Identifying Marking On Inlet And Exhaust Camshaft

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

Fit bearing covers.

Fig 17: Identifying Markings Of Inlet Camshaft Bearing Covers

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Insert all screws (1) and initially tighten so that they are free of play.

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

Fig 18: Inserting Inlet Camshaft Bearing Caps Screws

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Mount sprocket wheel and release chain tensioner.

Cams of both camshafts must point to top right.

Place special tool 11 6 321 on inlet 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 19: Placing Special Tool (11 6 332) On Inlet Camshaft

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

NOTE: See illustration.

Fig 20: Securing Special Tool (11 6 254) To Cylinder Head With Bolts

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Check inlet camshaft axial clearance.

Set up special tool 11 6 252 with dial gauge.

Refer to TECHNICAL DATA

Procedure for exhaust camshaft is identical.

Fig 21: Checking Inlet Camshaft Axial Clearance

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Adjust VALVE TIMING .

Assemble engine.