11 34 715 Replacing All Valve Springs (N51)

Special tools required: 

For the following special tools, refer to ENGINE - SPECIAL TOOLS (N51) .

• 11 0 346 
• 11 4 480 
• 11 9 000 
• 11 9 017 

Necessary preliminary tasks: 

• Remove cylinder head cover  . See 11 12 000 REMOVING AND INSTALLING OR SEALING CYLINDER HEAD COVER (N51) .
• Remove cylinder head  . See 11 12 100 REMOVING AND INSTALLING/SEALING CYLINDER HEAD (N51) .
• Remove exhaust camshaft  . See 11 31 028 REMOVING AND INSTALLING/REPLACING EXHAUST CAMSHAFT (N51) .
• Remove intermediate lever  . See 11 37 010 REMOVING AND INSTALLING/REPLACING INTERMEDIATE LEVER (N51) .
• Remove inlet camshaft  . See 11 31 025 REMOVING AND INSTALLING/REPLACING INLET CAMSHAFT (N51) .
• Remove roller cam follower  . See 11 33 050 REMOVING AND INSTALLING/REPLACING ALL ROCKER ARMS (N51) .

Place cylinder head on special tool 11 9 000. See Fig 1.

Press down inlet valves with special tool 11 9 017. See Fig 1.

Exhaust valves with special tool 11 0 346.

Fig 1: Identifying Special Tools

Courtesy of BMW OF NORTH AMERICA, INC.

Remove valve tapers with a magnet.

Remove valve spring and spring retainer.

Set down on special tool 11 4 480 in a tidy and orderly fashion. See 11 4 480 PLACEMENT BOARDS (2 X) .

Fig 2: Removing Valve Spring And Spring Retainer

Courtesy of BMW OF NORTH AMERICA, INC.

Color marking (1) is normally on lower end of valve spring.

Only the diameter pointing to the spring retainer at the bottom is required for correct installation of the valve spring.

Fig 3: Dimensions Of Valve Spring

Courtesy of BMW OF NORTH AMERICA, INC.

Arrangement:

1. Valve
2. Valve stem seal with spring plate, bottom
3. Valve spring
4. Top plate spring
5. Valve tapers

Fig 4: Exploded View Of Valve Assembly

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

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