11 34 715 

(cylinder head removed)

Preliminary tasks are described in disassembly and assembly of cylinder head, refer to 11 12 503.

Replacing all valve springs on engine BMW M73

Caution!

The valve supports on the special tool 11 0 180 have different angles.

Align spark plug apertures in valve supports to position of spark plugs in cylinder head.

Insert special tool 11 0 180 from below in special tool 11 1 065 and secure with special tool 11 1 045.

Replacing all valve springs on engine BMW M73

Note:

From 9/97 new valve spring (individual spring).

With the new valve spring, use special tool 11 0 345 instead of special tool 11 0 341.

Align special tool 11 0 341 in direction of valve shaft and select appropriate groove in special tool 11 0 342.

Replacing all valve springs on engine BMW M73

Press down valve spring on spring cap, top, and remove valve tapers.

Remove valve spring and plate spring.

Installation:

If one spring in the spring set (inner or outer spring) is damaged or broken, both springs must be replaced. Use only inner and outer springs made by the same manufacturer with the same color coding.

Replacing all valve springs on engine BMW M73

Up to 9/97

Arrangement with outer and inner valve springs:

  1. Valve
  2. Valve-stem seal
  3. Lower plate spring for outer spring
  4. Lower plate spring for inner spring
  5. Outer valve spring
  6. Inner valve spring
  7. Upper plate spring
  8. Valve tapers

Replacing all valve springs on engine BMW M73

From 9/97 to 4/99

Arrangement with one valve spring (individual spring):

  1. Valve
  2. Valve-stem seal
  3. Lower plate spring
  4. Valve spring
  5. Upper plate spring
  6. Valve tapers

Replacing all valve springs on engine BMW M73

From 4/99

Arrangement with one valve spring (individual spring) and an additional washer (X):

    1. Valve
    2. Valve-stem seal

X Washer

    1. Lower plate spring
    2. Valve spring
    3. Upper plate spring
    4. Valve tapers

Note:

From 4/99, a washer (X) will be installed to increase the valve spring force.

If the cylinder head has been disassembled to the extent that the valve springs can be removed without exerting extra effort, the washer (X) must be retrofitted.

It is ”not” absolutely necessary to retrofit the washer (X) on both cylinder heads.

Additional installation of washer (X) is only permitted on the ”individual spring”.