11 34 552 Removing and installing/replacing all valves (N63)

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Special tools required:

Necessary preliminary work:

Remove left cylinder head.
Remove right cylinder head.
Remove camshafts . See 11 31 036 REMOVING AND INSTALLING/REPLACING LEFT EXHAUST CAMSHAFT (N63) , 11 31 032 REMOVING AND INSTALLING/REPLACING LEFT INLET CAMSHAFT (N63) , 11 31 034 REMOVING AND INSTALLING/REPLACING RIGHT INLET CAMSHAFT (N63) or 11 31 038 REMOVING AND INSTALLING/REPLACING RIGHT EXHAUST CAMSHAFT (N63) .

Mount cylinder head (1) on special tool 11 9 000.

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

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Prepare special tool 11 9 008 on special tool 11 9 006 .

Fig 2: Attaching Special Tool (11 9 008) On Special Tool (11 9 006)

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

Slide locks (1) in direction of arrow and pretension with eccentric shaft.

Fig 3: Sliding Locks

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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: Identifying Valve Cotters

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IMPORTANT: Incorrect assembly possible.
Incorrect assembly will result in valve spring breakage.
Color marking (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 plate at bottom.

Fig 6: Identifying Valve Spring Dimensions

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Arrangement:

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

Fig 7: Identifying Valve, Valve Spring, Stem Seal, Keys And Top Spring Cup
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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: Attaching Special Tool (11 9 008) On Special Tool (11 9 006)

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Assemble engine.