11 34 552 Removing and installing/replacing all valves (N63O1)

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Special tools required:

Necessary preliminary tasks:

Remove LEFT CYLINDER HEAD .
Remove RIGHT CYLINDER HEAD .
Remove camshafts. See LEFT INLET CAMSHAFT , LEFT EXHAUST CAMSHAFT , RIGHT INLET CAMSHAFT , and RIGHT EXHAUST CAMSHAFT .
Remove the intermediate shaft. See REMOVING LEFT ECCENTRIC SHAFT and REMOVING RIGHT ECCENTRIC SHAFT .

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

Graphic N63.

Fig 1: Mounting Cylinder Head On Special Tool (11 9 000)

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Prepare special tool 11 9 008 .

Fig 2: Preparing Special Tools

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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 Correct Installation Position Of Valve Spring

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Arrangement:

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

Fig 7: Exploded View Of Valve
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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: Preparing Special Tools

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Assemble engine.