11 31 036 Removing and installing/replacing left exhaust camshaft (N63)

Special tools required:

11 4 480

(cylinder bank 5 to 8)

IMPORTANT: The exhaust 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 exhaust 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 exhaust camshaft (2) at dihedron with a fork wrench into a suitable position.

Fig 1: Rotating Exhaust 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.

Remove roller tappet from bearing cap (2 and 3) of high-pressure pump and set down on special tool 11 4 480.

Remove left exhaust camshaft and set down on special tool 11 4 480.

Fig 2: Left Exhaust 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 exhaust camshaft has been removed.

Do "not" remove rocker arms (1) on exhaust 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: Exhaust camshaft of cylinder bank 5 to 8 is marked with "A 5-8".

Fig 5: Identifying Camshaft Mark

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IMPORTANT: Rocker arms (1) slip slightly when exhaust 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.

Install exhaust camshaft (1).

Insert exhaust camshaft (1) so that cams point to side at cylinder 5 as shown in picture.

Fig 7: Identifying Exhaust 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 8: Identifying Bearing Caps Mark

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All bearing caps are marked:

L = cylinders 1-4

R= cylinders 5-8

E = intake 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, see 11 31 CAMSHAFT

Tightening torque: 11 31 7AZ.11 31 CAMSHAFT

Insert tappets for high-pressure pump.

Fig 9: Left Exhaust 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.