11 34 552 Removing and installing/replacing all valves (S63T 0)

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Special tools required:

Necessary preliminary tasks:

Remove LEFT CYLINDER HEAD .
Remove RIGHT CYLINDER HEAD .
Remove camshafts. See 11 31 036 REMOVING AND INSTALLING/REPLACING LEFT EXHAUST CAMSHAFT (S63T 0) and 11 31 038 REMOVING AND INSTALLING/REPLACING RIGHT EXHAUST CAMSHAFT (S63T 0) .
Remove the intermediate shaft. See 11 37 008 REMOVING AND INSTALLING/REPLACING RIGHT ECCENTRIC SHAFT (S63T 0) and 11 37 006 REMOVING AND INSTALLING/REPLACING LEFT ECCENTRIC SHAFT (S63T 0) .

Mount cylinder head (1) on special tool 11 9 001 .

NOTE: Illustrations shows N63 engine.

Fig 1: Mounting Cylinder Head On Special Tool 11 9 001

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Prepare special tool 11 9 008 .

Fig 2: Identifying Special Tool 11 9 008

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Position special tool 11 9 006 with silicone cushion on cylinder head.

Slide lock 11 9 005 in direction of arrow and pretension with eccentric shaft.

Fig 3: Sliding Lock

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Press down valve spring with special tool 11 8 840 .

Fig 4: Pressing Down Valve Spring Using Special Tool 11 8 840

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Remove valve cotters (1) with a magnet.

Place valve springs and valve keys on special tool 11 4 480 in an orderly manner.

Fig 5: Removing Valve Cotters

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IMPORTANT: Incorrect assembly possible.
Incorrect assembly will result in valve spring breakage.
Color coding (1) is normally on lower end of valve spring.
Only the diameter is decisive for the correct installation of the valve springs.
Install valve spring so that larger diameter points to spring cup at bottom.

Fig 6: Identifying Valve Spring Color Coding

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Arrangement:

Valve
Valve stem seal with spring cup, bottom
Valve spring
Top spring cup
Valve keys

Fig 7: Identifying Valve Stem Seal, Valve Spring, Top Spring Cup, Valve Keys
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Release special tool 11 9 006 from cylinder head.

Remove all valves and place on special tool 11 4 480 in an orderly manner.

Fig 8: Releasing Special Tool 11 9 006 From Cylinder Head

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Assemble engine.