11 34 552 Removing and installing/replacing all valves (N74): Notes

Necessary preliminary tasks: 

• Remove LEFT CYLINDER HEAD .
• Remove RIGHT CYLINDER HEAD .
• Remove camshafts. See RIGHT INTAKE CAMSHAFT , RIGHT EXHAUST CAMSHAFT , LEFT INTAKE CAMSHAFT , and LEFT EXHAUST CAMSHAFT .

Release screws (1).

Remove cable duct.

Fig 1: Identifying Cable Duct Screws

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

Fig 2: 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 3: Identifying Special Tool 11 9 008

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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 4: Sliding Locks

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Press down valve spring with special tool 11 8 840 .

Fig 5: 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 6: Identifying Valve Cotters

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Incorrect installation 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 7: Identifying Color Marking On Valve Spring

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