11 31 025 Removing and installing or replacing the intake camshaft (M57T2-SCR)

Necessary preliminary work:

REMOVE CYLINDER HEAD COVER

Crank engine at crankshaft with special tool 11 6 480.

The cams on the intake 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 setting.

Camshaft sprocket classification (0) value from 0 to 9

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

Fig 1: Identifying Intake Camshaft Bolts

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Unscrew the screw plug in the gear case cover at bottom.

Fig 2: Locating Screw Plug On Gear Case Cover

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IMPORTANT: No piston is permitted to be in the TDC setting 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 tensioner is forced back by rotating the exhaust and intake camshafts.

Lock hydraulic chain tensioner with special tool 11 3 340.

NOTE: If the camshaft sprocket 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 note:

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 camshaft sprocket bolts (1).

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

Release bearing journal (2) of guide rails.

Fig 7: Identifying Camshaft Sprocket Bolts And Bearing Journal Of Guide Rails

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

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

Fig 8: Releasing Camshaft Sprocket With Chain From Intake Camshaft

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

Fig 9: Removing Camshaft Sprocket

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

NOTE: Illustration shows M57TU.

Fig 10: Loosening Screws Of Intake Camshaft Bearing Cap

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

All bearing caps are marked.

E= intake camshaft.

A = exhaust camshaft.

Fig 11: Lifting Out Intake Camshaft

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

Fig 12: Identifying Rocker Arms

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IMPORTANT: These screws must "not" be removed.

Fig 13: Caution For Removing Screws

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NOTE: E Intake camshaft
A Exhaust camshaft

Fig 14: Identifying Intake And Exhaust Camshaft

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Insert intake camshaft.

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

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

If necessary, re-secure camshafts.

Fig 15: Identifying Positions Of Intake And Exhaust Camshaft Gears

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Mark (1) on intake camshaft must be between marks (2) on exhaust camshaft.

See graphic.

Fig 16: Identifying Marks On Intake And Exhaust Camshaft

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The intake camshaft bearing caps are legibly marked E 1... E 7 from the exhaust side.

Fit bearing caps.

Fig 17: Identifying Markings Of Intake Camshaft Bearing Caps

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

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

Fig 18: Inserting Intake Camshaft Bearing Caps Screws

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Mount camshaft sprocket and release chain tensioner.

Cams of both camshafts must point to top right.

Fit special tool 11 6 321 on intake camshaft.

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

Installation note:

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

Fig 19: Fitting Special Tool (11 6 321) On Intake Camshaft

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Secure special tool 11 6 254 on the cylinder head with screws (1).

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

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Check intake camshaft side clearance.

Set up special tool 11 6 252 with dial gauge.

Refer to TECHNICAL DATA

Procedure for exhaust camshaft is identical.

Fig 21: Checking Intake Camshaft Side Clearance

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Adjust VALVE TIMING .

Assemble engine.