11 31 038 Removing and installing/renewing right exhaust camshaft (N63)

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Special tools required:

11 4 480

Cylinders 1-4:

IMPORTANT: Risk of damage!
The exhaust camshaft must first be rotated in such a way that the camshaft is free from tension when the bearing caps are released.

Necessary preliminary tasks:

Remove right HIGH-PRESSURE PUMP
Remove right CYLINDER HEAD COVER
Remove right EXHAUST CAMSHAFT ADJUSTER

IMPORTANT: No cam on the exhaust camshaft is permitted to press directly onto a roller cam follower.
With cylinder no. 1 at 150° before TDC firing position there is no piston in the TDC position.

Rotate exhaust camshaft (2) at dihedron with a fork wrench into a suitable position.

Fig 1: Checking Locking Camshaft Adjusters

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NOTE: The intake camshaft of cylinder bank 5-8 is marked "E 5-8".

Fig 2: Identifying Camshafts

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Release bolts of camshaft bearings in sequence (10 to 1) in 1/2 turns.

Set all bearing caps down in special tool 11 4 480 in a neat and orderly fashion.

Remove roller tappet from bearing caps (2 and 3) of high pressure pump and lay down in special tool 11 4 480 .

Remove left exhaust camshaft and lay down in special tool 11 4 480 .

Fig 3: Right Exhaust Camshaft Bearing Cap Bolts Tightening/Loosening Sequence (N63)

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IMPORTANT: Rocker arms (1) of can slip slightly when inlet camshaft is fitted.
Make sure rocker arms (1) are secured as illustrated on hydraulic valve clearance compensating elements and on valves.

Align all rocker arms (1) straight.

Fig 4: Identifying Rocker Arm

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IMPORTANT: Plain rectangular compression rings (1) can easily break.

If necessary, replace plain compression rings (1).

Press plain rectangular compression ring (1) on one side into groove, pull up on other side and unhook latch mechanism.

Carefully pull plain rectangular compression ring (1) apart and remove towards front.

Ends of plain rectangular compression rings (1) point upwards.

Make sure plain rectangular compression rings (1) are engaged at ends.

Fig 5: Identifying Plain Rectangular Compression Rings

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Coat all bearing positions with engine oil.

Fig 6: Locating Bearings

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Install exhaust camshaft (1).

Turn exhaust camshaft (1) until cams point to side at cylinder no. 1 as shown in graphic.

Fig 7: Identifying Exhaust Camshaft With Cams Pointing To Side At Cylinder 1

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IMPORTANT: Bearing caps of cylinders 1-4 and cylinders 5-8 must not be interchanged.
All bearing caps are coded and can only be installed in one position.

All bearing caps are marked with letters and numbers:

L = Cylinder bank 1-4.

R= Cylinder bank 5-8.

E = Intake side

A = Exhaust side

1 = Marking, bearing point, from 1 to 5

Fig 8: Identifying Bearing Cap Markings

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Insert all bolts.

Tighten down bolts in sequence (1 to 10) in 1/2 turns.

Tightening torque 11 31 6AZ .

Tightening torque 11 31 7AZ .

Fig 9: Right Exhaust Camshaft Bearing Cap Bolts Tightening/Loosening Sequence (N63)

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Install right INLET AND EXHAUST CAMSHAFT ADJUSTERS .

Adjust VALVE TIMING .

Assemble engine.