11 34 715 Replacing all valve springs (N62)

WARNING: This page is about a different variant/trim than selected.

Special tools required:

11 0 346
11 9 470

(cylinder head removed)

Preliminary tasks are described in Disassembling and assembling cylinder head .

Remove bearing bracket (1) with inlet camshaft and stow in special tool 11 9 470. The procedure is described in the section Removing and installing inlet camshaft.

Fig 1: Removing Bearing Bracket With Inlet Camshaft

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Remove exhaust camshaft.

Align special tool 11 0 346 in direction of valve shaft.

Fig 2: Aligning Special Tool 11 0 346 In Direction Of Valve Shaft

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Press down valve spring on spring cap, top, and remove valve keys.

Fig 3: Removing Valve Keys

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CAUTION: Incorrect installation possible.
Valve springs of exhaust and inlet camshafts are different. Incorrect installation will result in engine damage.

NOTE: Valve springs for exhaust valves are approx. 4 mm longer.

Valve springs of inlet valves
Valve springs of exhaust valves

Fig 4: Identifying Inlet Valves And Exhaust Valves Spring Height
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CAUTION: Incorrect installation possible.
Incorrect installation will result in valve spring breakage.
The color coding (1) is normally located on the lower end of the 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 5: Identifying Color Coding On Lower End Of Valve Spring

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Arrangement:

Valve
Valve stem seal with spring plate, bottom
Valve spring
Top spring plate
Valve tapers

Fig 6: Identifying Valve Parts

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