11 34 715 Replacing all valve springs (N52K)

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

Necessary preliminary tasks:

Place cylinder head on special tool 11 9 000.

Press down inlet valves with special tool 11 9 017.

Press down exhaust valves with special tool 11 0 346.

Fig 1: Pressing Down Inlet Valves Using Special Tool (11 9 017)

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Remove valve cotters with a magnet.

Remove valve spring with spring plates.

If the individual components are to be reused, they must be placed in neat order in special tool 11 4 480.

Fig 2: Removing Valve Spring And Plate Spring

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IMPORTANT: Incorrect installation possible.
Incorrect installation will result in valve spring breakage.
Risk of mixing up the valve springs for the inlet and exhaust valves.

The valve spring is colour-coded (1) at the lower end.

Install the valve spring so that the larger diameter points to the lower spring plate.

Fig 3: Identifying Valve Spring Dimensions

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Arrangement:

Valve
Valve stem seal with lower spring plate
Valve spring
Upper spring plate
Valve tapers

Fig 4: Identifying Upper/Lower Spring Plate, Valve Spring And Valve Stem Seal

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Assemble engine.

Check function of DME; if necessary, readjust uniform mixture distribution.