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Home >> Porsche >> 2023 >> Taycan Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 102 (15 Engine - Cylinder Head, Valve Drive 4.0L Turbo Hybrid -- 971 - PANAMERA (971)) >> WM, 156356 Replacing Valve-Stem Seals (V8 BITURBO) >> Replacing Valve-Stem Seals (Cylinder Head Removed)

Replacing Valve-Stem Seals (Cylinder Head Removed)

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  1. > VAS 6419 - Insert cylinder head tensioning device-4-  into the > VAS 6095A - engine and gearbox bracket-3-  and secure with the holders VAS6419/1 -1-  and VAS6419/2 -2- 
    1. 1.1 Cylinder head tensioning device must now be connected to compressed air.
    2. 1.2 Using the lever -Arrow-  , push the air cushion under the combustion chamber on which you want to remove the valve stem seal.
    3. 1.3 Allow as much compressed air as required to flow into the air cushion until it is touching the valve discs.
    G15823815Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Cylinder head tensioning device in the engine and gearbox bracket

  2. > VAS 5161A/43 - Guide plate-1-  must now be secured on the cylinder head.
    1. 2.1 > VAS 5161A/43 - 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-  to > 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 plate and loosen any tight valve keys by tapping them with a plastic hammer.
    G15823816Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Guide plate on cylinder head

  3. Remove valve springs using > VAS 5161A - removal and installation device for valve cotters  .
    1. 3.1 Screw retainer VAS 5161/6 -2-  with guided fork and M8 threaded bolt VAS 5161/5 -3-  into the guide plate.
    2. 3.2 Insert assembly cartridge VAS 5161/8A -4-  into the bore over the valve spring to be removed.
    3. 3.3 Engage pressure fork VAS 5161/2 -1-  in the retainer VAS 5161/6 -2-  and press assembly cartridge down.
    4. 3.4 At the same time, turn the knurled screw -Arrow-  on the assembly cartridge clockwise until the tips engage in the valve collets.
    5. 3.5 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. 3.6 Relieve tension on pressure fork VAS 5161/2 -1-  and remove assembly cartridge VAS 5161/8A -4-  .
      1. 3.6.1 Remove valve keys from the assembly cartridge.
    G15823817Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Removing valve keys

  4. Pull off valve-stem seal to be replaced using the puller > 3364 - Valve stem seal puller-1-  .
    G15823818Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Removal of valve-stem seal

  5. Installation of new valve-stem seal: 
    1. 5.1 To avoid damaging the new valve-stem seal -2-  during installation, fit the assembly sleeve -1-  on the valve stem.
    2. 5.2 Lightly oil the sealing lip on the valve-stem seal.
    3. 5.3 Insert valve-stem seal -2-  into the > 3365 - press-on tool-3-  and carefully press it over the assembly sleeve -1-  as far as it will go onto the valve guide.
    4. 5.4 Remove assembly sleeve -1-  .
    G15823819Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Installing valve-stem seal

  6. Insert valve springs and valve-spring plates in their original position. Observe installation positions.
  7. Install valve keys.
    1. 7.1 Insert assembly cartridge VAS 5161/8A -4-  into the > VAS 5161A/43 - guide plate  .
    2. 7.2 Press pressure fork VAS 5161/2 -1-  down, pull knurled screw -Arrow-  on the assembly cartridge VAS 5161/8A -4-  upwards by turning it back and forth, thereby inserting the valve collets.
    3. 7.3 Relieve pressure on the pressure fork VAS 5161/2 -1-  whilst pulling on the knurled screw.
    G15823820Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Installation of the valve keys

  8. Do the same on the other cylinders. When all valve-stem seals have been replaced, remove the special tools from the cylinder head.
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