11 31 034 Removing and installing/replacing right inlet camshaft (N63)

Special tools required:

11 4 480

(cylinder bank 1 to 4)

IMPORTANT: The inlet camshaft must first be rotated in such a way that the camshaft is free from tension when the bearing caps are released (risk of damage) .

Necessary preliminary tasks:

Remove right cylinder head cover .
Check timing .
Remove right inlet adjustment unit .

IMPORTANT: No cam on the inlet camshaft is permitted to press directly onto a roller cam follower.

With cylinder no. 1 at 150° before firing TDC there is no piston in the TDC position.

Rotate right inlet camshaft (2) at dihedron with a fork wrench (1) into a suitable position.

NOTE: Illustration shows cyl. 5 to 8.

Fig 1: Rotating Right Inlet Camshaft

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

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

Inlet camshaft

Fig 2: Right Intake Camshaft Bearing Cap Bolts Tightening/Loosening Sequence

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IMPORTANT: Used rocker arms (1) may only be reused in the same position.

NOTE: Rocker arms (1) are freely accessible after inlet camshaft has been removed.

Do "not" remove rocker arm (1) on inlet side.

Fig 3: Identifying Rocker Arms

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

If necessary, replace plain compression rings (1).

Press compression ring (1) on one side into groove, pull up on other side and remove catch.

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

Ends of compression rings (1) point upwards.

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

Fig 4: Pressing Compression Ring On Side Into Groove

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NOTE: Inlet camshaft of cylinder bank 5 to 8 is marked with "E 5-8".

Fig 5: Identifying Camshaft Mark

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IMPORTANT: Rocker arms (1) 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 6: Identifying Rocker Arms

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Coat all bearing points with engine oil.

Fig 7: Identifying Bearing Points

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Insert inlet camshaft.

Insert inlet camshaft (1) so that cams point to side at cylinder 1 as shown in picture.

Fig 8: Identifying Inlet Camshaft

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IMPORTANT: Do not mix up the bearing caps of cylinders 1 to 4 and 5 to 8.

All bearing caps are coded and can only be installed in one position.

All bearing caps are marked with letters and numbers:

Fig 9: Identifying Bearing Caps Mark

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L = cylinder bank 1-4

R= cylinder bank 5-8

E = inlet side

A = exhaust side

1 = designation, bearing point, from 1 to 5

Insert all bolts.

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

Tightening torque: 11 31 6AZ, see 11 31 CAMSHAFT

Tightening torque: 11 31 7AZ, see 11 31 CAMSHAFT

Fig 10: Right Intake Camshaft Bearing Cap Bolts Tightening/Loosening Sequence

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Install inlet adjustment unit .

Adjust valve timing . See left side and right side

Assemble engine.