11 31 001 Replacing camshafts (M57T2)

Necessary preliminary tasks:

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 And Sprocket Wheel Classification

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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.

Fig 3: Turning Exhaust Camshaft On Hexagon Head

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

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).

Release bearing pins (2) of guide rails.

Installation:

Replace bearing pins (2).

Fig 7: Identifying Sprocket Wheel Bolts And Bearing Pins

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

Fig 10: Releasing Camshaft Bearing Caps Screws

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Remove bearing caps and camshafts.

All bearing caps are marked.

Fig 11: Removing Bearing Caps And Camshafts

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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 Camshafts

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Align camshafts so that cam tips of inlet and exhaust camshafts of 1st cylinder point in direction of travel to right.

NOTE: See illustration.

Fig 15: Locating Inlet And Exhaust Cams

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Install camshaft.

Align marking (1) on inlet camshaft flush with cylinder head.

Marking (2) on exhaust camshaft flush with cylinder head.

Fig 16: Identifying Markings Of Inlet And Exhaust Camshaft

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

See illustration.

Fig 17: Identifying Markings On Inlet And Exhaust Camshaft

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

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

Fit bearing caps.

Fig 18: Identifying Markings Of Intake And Exhaust Camshaft Bearing Covers

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

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

Fig 19: Inserting Camshaft Bearing Caps Screws

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Screw special tool 11 6 254 onto cylinder head.

NOTE: See illustration.

Fig 20: Securing Special Tool (11 6 254) Onto Cylinder Head

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Check inlet camshaft axial clearance.

Set up special tool 11 6 250 with dial gauge.

Refer to TECHNICAL DATA

Fig 21: Checking Inlet Camshaft Axial Clearance

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Adjust VALVE TIMING .

Assemble engine.