11 34 552 Removing and installing/replacing all valves (N20)

Special tools required: 

• 11 4 481
• 11 4 482

Necessary preliminary tasks: 

• Remove CYLINDER HEAD .
• Remove INTERMEDIATE LEVER .
• Remove ECCENTRIC SHAFT .
• Remove INTAKE CAMSHAFT .
• Remove EXHAUST CAMSHAFT .
• Remove ROCKER ARM .
• Remove VALVE SPRINGS .
• Remove VALVE STEM SEALS .

Arrangement:

1. Intake valve 5 mm dia.
2. Valve stem seal with lower spring cup
3. Valve spring
4. Upper spring cup
5. Valve keys

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

Fig 1: Identifying Intake Valve, Spring And Valve Keys

Arrangement:

1. Discharge valve 6 mm dia.
2. Valve stem seal with lower spring cup
3. Valve spring
4. Upper spring cup
5. Valve keys

If the valves are to be reused, they must be placed in neat order in special tool 11 4 482 .

Fig 2: Identifying Intake Valve, Spring And Valve Keys

Assemble engine.

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