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Home >> Porsche >> 2018 >> Panamera Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (15 Engine - Cylinder Head, Valve Drive 2.9L Turbo Gas -- 971 - PANAMERA (971)) >> WM, 156355 Replacing Valve-Stem Seals (V6 Turbo) >> Replacing Valve-Stem Seals >> 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.
NOTE: 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 at least 6 bar.

    → Cover passages and openings from the cylinder head into the crankcase.

  1. Prepare guide plate -1-  .
    1. 1.1 Tighten M8 hexagon socket head bolts with a large bolt head diameter -arrow-  (from > VAS 5161A - Removal and Installation Device for Valve Keys  ) on the underside of the > VAS 5161A/38 - Guide plate  (-1-  ).
    G15822296Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Guide plate on cylinder head

  2. Turn the crankshaft clockwise using > T40263 - wrench, a/f 21  and special tool > T40314 - adapter  at the pulley until the piston in the relevant cylinder is at the BDC  position.
  3. > VAS 5161A/38 - Guide plate  (-1-  ) must now be secured to the cylinder head.
    1. 3.1 > 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. 3.2 Tighten screws -Arrows-  to > Tightening torque 9 Nm (6.5 ftlb.)  .
    3. 3.3 Position punch VAS 5161/3A  (-2-  ) from tool set > VAS 5161A - Removal and Installation Device for Valve Keys  on the valve-spring plate and loosen any tight valve keys by tapping them with a plastic hammer.
    G15822297Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Screws on guide plate

  4. Build up overpressure in the relevant combustion chamber.
    1. 4.1 Screw compression stud VAS 5161/10  from tool set > VAS 5161A - Removal and Installation Device for Valve Keys  hand-tight into the > VAS 5161A/38 - Guide plate  .
    2. 4.2 Fit special tool > T40012 - adapter  with sealing ring hand-tight in the guide plate.
    3. 4.3 Connect compressed air to the > T40012 - adapter  .
      1. 4.3.1 Minimum pressure: 6 bar 
  5. Remove valve springs using > VAS 5161A - Removal and Installation Device for Valve Keys  .
    1. 5.1 Screw retainer VAS 5161/6  with guide fork -1-  and M8 threaded bolt VAS 5161/5  into the guide plate > Removing valve keys 
    2. 5.2 Insert assembly cartridge -2- VAS 5161/8A  into the guide plate.
    3. 5.3 Engage pressure fork -3- VAS 5161/2  on the retainer VAS 5161/6. 
    4. 5.4 Press assembly cartridge -2- VAS 5161/8A  down and turn the knurled screw -arrow-  on the assembly cartridge -2- VAS 5161/8A  to the right at the same time until the tips engage in the valve keys.
    5. 5.5 Turn the knurled screw -arrow-  back and forth to press the valve keys apart and engage them in the assembly cartridge -2- VAS 5161/8A  . The knurled screw slips as far as it will go into the assembly cartridge -2-  .
    G15822298Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Removing valve keys

  6. Relieve pressure fork VAS 5161/2  and remove assembly cartridge VAS 5161/8A. 
    1. 6.1 Remove valve keys from the assembly cartridge.
  7. Mark the installation position of the valve springs for the outlet valves for re-installation.
  8. Remove valve springs with valve-spring plates and sort according to installation position for re-installation.
  9. Pull off valve-stem seal to be replaced using the puller > 3364 - Puller  (-1-  ) > Puller 3364 on cylinder head 
    G15822299Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Puller 3364 on cylinder head

  10. Installing new valve-stem seal on intake side: 
    1. 10.1 To avoid damaging the new valve-stem seal -4-  during installation, fit the assembly sleeve -3-  on the valve stem -2-  .
    2. 10.2 Lightly oil the sealing lip on the valve-stem seal -4-  .
    3. 10.3 Insert valve-stem seal -4-  into the > 3365 - press-on tool  (-5-  ) and carefully press it over the assembly sleeve -3-  as far as it will go onto the valve guide -1-  .
    4. 10.4 Remove assembly sleeve -3-  .
    G15822300Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Installing valve-stem seal on intake side

  11. Installing new valve-stem seal on outlet side: 
    1. 11.1 To avoid damaging the new valve-stem seal -4-  during installation, fit the assembly sleeve -3-  on the valve stem -2-  .
    2. 11.2 Coat sealing lip of the valve-stem seal -4-  with oil.
    3. 11.3 Insert valve-stem seal -4-  into the > T40376/2 - press-on tool  (-5-  ) and carefully press it over the assembly sleeve -3-  as far as it will go onto the valve guide -1-  .
    4. 11.4 Remove assembly sleeve -3-  .
    G15822301Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Installing valve-stem seal on outlet side

  12. Pick up valve keys with assembly cartridge VAS 5161/8A. 
    1. 12.1 Insert valve keys into the insertion device VAS 5161/18. 
      1. 12.1.1 The large diameter of the valve keys must be facing upwards.
    2. 12.2 Press assembly cartridge VAS 5161/8A  onto the valve keys from above and pick up the valve keys.
  13. Insert valve springs and valve-spring plates in their original position. Observe installation positions.
    1. 13.1 Installation position of valve springs - intake valve:  The closely spaced spring coils are facing down towards the cylinder head.
    2. 13.2 Installation position of valve springs - outlet valve:  The coloured markings must be facing upwards.
  14. Insert assembly cartridge VAS 5161/8A  into the > VAS 5161A/38 - Guide plate  .
  15. Install valve keys.
    1. 15.1 Press pressure fork VAS 5161/2  down, pull knurled screw on the assembly cartridge VAS 5161/8A  upwards by turning it back and forth, thereby inserting the valve collets.
    2. 15.2 Reduce pressure on the pressure fork whilst pulling on the knurled screw.
  16. When all valves are secured again, disconnect the compressed air connection from > T40012 - adapter  and unscrew > T40012 - adapter  .
  17. Do the same on the other cylinders. When all valve-stem seals have been replaced, remove the special tool from the cylinder head.
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