LEMON Manuals: Even more car manuals for everyone
Home >> Porsche >> 2023 >> Cayenne Base, 4D Utility Coupe >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (15 Engine - Cylinder Head, Valve Drive 4.0L -- 9YA - Cayenne (9YA)) >> WM, 156356 Replacing Valve-Stem Seals (V8 BITURBO) >> Replacing Valve-Stem Seals (Cylinder Head Installed)

Replacing Valve-Stem Seals (Cylinder Head Installed)

WARNING: This page is about a different variant/trim than selected.
  1. Turn the crankshaft clockwise using > T40263 - wrench a/f 21-1-  and > T40314 - adapter-2-  on the belt pulley until the piston of the relevant cylinder is at the bottom dead center (BDC)  position.
    G15211584Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Turning the engine

  2. > VAS 5161A/38 - Guide plate-1-  must now be secured on the cylinder head.
    1. 2.1  > VAS 5161A/38 - Guide plate-1-  on the cylinder head must be aligned above the relevant combustion chamber.

      Observe markings A-Outlet side/E - Intake side  while doing this.

    2. 2.2  Tighten screws -Arrows-  with > Tightening torque 9 Nm (6.6 ftlb.)  .
    3. 2.3  Fit punch VAS 5161/3A -2-  from tool set > VAS 5161A - Removal and installation device for valve keys  on the valve spring seat and loosen any tight valve keys by tapping them with a plastic hammer.
    G15211585Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Guide plate on cylinder head

    NOTIFICATION 

    Engine damage 

    • Risk of damage to valves due to incorrect handling 
      • → To prevent the valve from falling into the cylinder, the guide plate and sealing pins must not be unscrewed.
      • → Overpressure in the cylinder must be kept at least 6 bar.
      • → Cover passages and openings from the cylinder head into the crankcase.
  3. Build up overpressure in the relevant combustion chamber.
    1. 3.1  Screw sealing pin VAS 5161/10 -2-  from tool set > VAS 5161A - Removal and installation device for valve keys  into the > VAS 5161A/38 - guide plate  .
    2. 3.2  Screw the hose adapter > T40012 - adapter-1-  hand-tight into the respective spark plug thread.
    3. 3.3  Connect compressed air to the hose adapter > T40012 - adapter-1-  .
      1. 3.3.1 Minimum pressure: 6 bar 
    G15211586Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Hose adapter and guide plate on cylinder head

  4. Remove valve springs using > VAS 5161A - removal and installation device for valve keys  .
    1. 4.1  Screw retainer VAS 5161/6 -2-  with guide lock and M8 threaded bolt VAS 5161/5 -3-  into the guide plate.
    2. 4.2  Insert assembly cartridge VAS 5161/8A -4-  into the bore over the valve spring to be removed.
    3. 4.3  Engage pressure fork VAS 5161/2 -1-  in the retainer VAS 5161/6 -2-  and press assembly cartridge down.
    4. 4.4  At the same time, turn the knurled screw -Arrow-  on the assembly cartridge clockwise until the tips engage in the valve collets.
    5. 4.5  Turn the knurled screw -Arrow-  back and forth to press the valve collets apart and capture them in the assembly cartridge. The knurled screw slips as far as it will go into the assembly cartridge.
    6. 4.6  Relieve pressure on pressure fork VAS 5161/2 -1-  and remove assembly cartridge VAS 5161/8A -4-  .
      1. 4.6.1  Remove valve keys from the assembly cartridge.
        G15211587Courtesy of PORSCHE CARS NORTH AMERICA, INC.

        Removing valve keys

  5. Remove valve spring with valve-spring plate and mark installation position.
  6. Pull off the valve-stem seal using the > 3364 - puller-1 -  .
    G15211588Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Removing valve-stem seal

  7. Installing new valve-stem seal: 
    1. 7.1  To avoid damaging the new valve-stem seal -2-  during installation, fit the assembly sleeve -1-  on the valve stem.
    2. 7.2  Lightly oil the sealing lip on the valve-stem seal.
    3. 7.3  Insert valve-stem seal -2-  into the valve stem seal > 3365 - fitting tool-3-  and press it carefully over the assembly sleeve -1-  as far as it will go onto the valve guide.
    4. 7.4  Remove assembly sleeve -1-  .
      G15211589Courtesy of PORSCHE CARS NORTH AMERICA, INC.

      Installing valve-stem seal

  8. Insert valve springs and valve-spring plates in their original position. Observe installation positions.
  9. Install valve keys.
    1. 9.1  Insert assembly cartridge VAS 5161/8A -4-  into the > VAS 5161A/38 - guide plate  .
    2. 9.2  Press down the pressure fork VAS 5161/2 -1-  , pull the knurled screw -Arrow-  on the assembly cartridge VAS 5161/8A -4-  upwards by turning it to the left and to the right, this will insert the valve cone pieces.
    3. 9.3  Relieve pressure on pressure fork VAS 5161/2 -1-  whilst pulling on the knurled screw.
    4. 9.4  Repeat the procedure on each valve.
      G15211590Courtesy of PORSCHE CARS NORTH AMERICA, INC.

      Installation of the valve keys

  10. When all valves are secured again, disconnect the compressed air connection and unscrew > T40012 - adapter  .
  11. Do the same on the other cylinders. When all valve-stem seals have been replaced, remove the special tools from the cylinder head.
scientia non olet · About LEMON Manuals