11 34 552 

(cylinder head removed)

Preliminary tasks are described in disassembly and assembly of cylinder head, refer to 11 12 503.
Remove valves from cylinder head. If necessary, check valve guide for wear, refer to 11 12 595.
If necessary, ream out valve guide, refer to 11 12 600.
If necessary, remachine valve seat, refer to 11 12 527.
Remove valve stem seals, refer to 11 34 560.

Removing and installing, replacing all valves 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

Removing and installing, replacing all valves 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

Removing and installing, replacing all valves 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”.