11 34 715 Replacing all valve springs (N20)

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

Special tools required:

Necessary preliminary tasks:

Remove CYLINDER HEAD .
Remove EXHAUST CAMSHAFT .
Remove INTERMEDIATE LEVER .
Remove INTAKE CAMSHAFT .
Remove ROCKER ARM .

Place cylinder head on special tool 11 9 000 .

Align special tool 11 9 007 on particular combustion chamber.

Fig 1: Aligning Special Tool (11 9 007) On Particular Combustion Chamber

Position special tool 11 9 007 on cylinder head.

Push locks (1 and 2) toward inside and preload via eccentric shaft.

Fig 2: Identifying Special Tool (11 9 007) On Cylinder Head

Press down valve springs with special tool 11 8 840 .

Fig 3: Locating Valve Springs With Special Tool (11 8 840)

Remove valve key (1) with a magnet.

Remove valve spring with spring cups.

If individual components are to be reused, they must be placed in neat order in special tool 11 4 481 .

Fig 4: Identifying Valve Key

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

Valve springs are marked in colour (1).

Colours for intake valves:

Fig 5: Identifying Valve Spring Dimensions

Green/blue
Yellow/Blue

Colours for discharge valves:

Green/white
Yellow/white

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

Arrangement:

Valve
Valve stem seal with lower spring cup
Valve spring
Upper spring cup
Valve keys

Fig 6: Identifying Intake Valve, Spring And Valve Keys

Assemble engine.

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