Removing Valve Lifters (Hydraulic Tappets)

Information 

• The hydraulic tappets are fitted as bucket tappets on the outlet side and as switching tappets for valve lift switchover on the intake side. 
• Switching tappets and bucket tappets cannot be interchanged. 
• The hydraulic tappets have a twist lock for the cylinder head. 

Information 

• If the hydraulic tappets are to be re-used, they must be marked according to installation position using a water-resistant felt-tip pen and set aside in such a way that they cannot be mixed up! 
• If the hydraulic tappets are to be re-used, they must be installed at the same position! 
  Fig 1: Exploded View Of Camshafts, Cylinder Bank 1 To 4

  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
  1. Camshaft (outlet)
  2. Camshaft (intake)
  3. Hydraulic valve for variable valve lift control
  4. Screw, M5 x 12
  5. Switching tappet (oil with engine oil)
  6. Bucket tappet (oil with engine oil)
  7. Plug
  8. Mounting saddle 1 to 4
  9. Plug
  10. Bearing locations (oil with engine oil)
  1. Direction of travel
  Fig 2: Exploded View Of Camshafts, Cylinders 5 To 8

  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
  1. Switching tappet (oil with engine oil)
  2. Bucket tappet (oil with engine oil)
  3. Camshaft (intake)
  4. Hydraulic valve for variable valve lift control
  5. Screw, M5 x 12
  6. Camshaft (outlet)
  7. Plug
  8. Mounting saddle, cylinders 5 to 8
  9. Plug
  10. Bearing surfaces (oil with engine oil)
  1. Direction of travel

1. Pull the hydraulic tappets out of the cylinder head one after the other → Hydraulic tappet  and set them aside in such a way that they cannot be mixed up → Putting components down without mixing them up (cylinder bank 5-8 shown here as an example)  .
   Fig 3: Pulling Hydraulic Tappets Out Of Cylinder Head

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
   1. E  - Intake side
   2. A  - Exhaust side

   5 to 8  - Cylinders

   Fig 4: Identifying Intake And Exhaust Side Cylinder Bank 5-8

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.