11 31 001 Replacing camshafts (M57T2- SCR)

Necessary preliminary work:

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 And Camshaft Sprocket

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Undo screw plug in 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.

NOTE: The hydraulic chain tensioner is forced back by rotating the exhaust and intake 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 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).

Release bearing journals (2) of guide rails.

Installation note:

Replace bearing journals (2).

Fig 7: Identifying Camshaft Sprocket Bolts And Bearing Journals

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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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Release screws (1) of camshaft bearing cap in 1/2 revolution 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 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 Camshafts

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

NOTE: See graphic.

Fig 15: Locating Inlet And Exhaust Cams

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Install camshaft.

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

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

Fig 16: Identifying Markings Of Intake And Exhaust Camshaft

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

See graphic.

Fig 17: Identifying Marks On Intake And Exhaust Camshafts

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

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

Fit bearing caps.

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

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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 revolution 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 graphic.

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

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Check intake camshaft side clearance.

Set up special tool 11 6 250 with dial gauge.

Refer to TECHNICAL DATA

Fig 21: Checking Intake Camshaft Side Clearance

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Adjust VALVE TIMING .

Assemble engine.