11 34 715 Replacing All Valve Springs (N12)

Special tools required: 

• 11 4 480 
• 11 9 000 
• 11 9 006 
• 11 9 007 
• 11 9 017 

Necessary preliminary tasks: 

• Remove cylinder head.
• Remove exhaust camshaft.
• Remove intermediate lever.
• Remove inlet camshaft.
• Remove roller cam follower.

Place cylinder head (1) on special tool 11 9 000  .

Fig 1: Identifying Cylinder Head On Special Tool (11 9 000)

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Prepare special tool 11 9 007  on special tool 11 9 006  .

Fig 2: Identifying Special Tool (11 9 006 And 11 9 007)

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Align special tool 11 9 006.

Lock eccentrics (1) on special tool 11 9 000 in direction of arrow.

Fig 3: Identifying Special Tool (11 9 006)

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Press down valve spring and spring retainer (1) with special tool 11 9 017  .

Fig 4: Identifying Special Tool (11 9 017) On Spring Retainer

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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.

Fig 5: Removing Valve Spring And Spring Retainer

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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 6: Identifying Valve Spring Diameter

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Arrangement: 

1. Valve
2. Valve stem seal with spring plate, bottom
3. Valve spring
4. Top plate spring
5. Valve tapers
   Fig 7: Identifying Valves Components Arrangement Sequence

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Assemble engine.

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