11 31 032 Removing and installing/replacing left inlet camshaft (N63)

Special tools required:

11 4 480

(cylinder bank 5 to 8)

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 left cylinder head cover .
Check timing .
Remove left 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 left inlet camshaft with a fork wrench (1) into a suitable position.

Fig 1: Rotating Left 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: Left 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.

Insert inlet camshaft.

Fig 7: Identifying Inlet Camshaft Bearing Points

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Insert inlet camshaft (1) so that cams point to side at cylinder 5 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.

Fig 9: Identifying Bearing Caps Mark

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All bearing caps are marked:

L = cylinders 1-4

R= cylinders 5-8

E = inlet side

A = exhaust side

1 = designation from 1 to 5

Insert all bolts.

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

Tightening torque: 11 31 6AZ.11 31 CAMSHAFT

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

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

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Install inlet adjustment unit .

Adjust valve timing. See left side and camshaft timing on right side .

Assemble engine.