Removing Crankshaft Sealing Ring - Flywheel Side

Information 

• Work on delicate engine parts must be carried out conscientiously and precisely. 
• Use a suitable tray. 
• Absolute cleanliness is essential. 

Crankshaft flange sealing ring: 

Fig 1: Identifying Crankshaft Flange Sealing Ring On Flywheel Side

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

→ Avoid contact with caustic fluid.

→ Wear personal protective gear.

→ Ensure that there is good ventilation.

→ If you do come into contact, wash off immediately with plenty of warm water and contact a doctor if necessary.

1. Carefully remove small edges or burrs on the chamfer of the crankshaft flange with an oilstone.
   1. 1.1. Then, carefully remove metal chips and residual dirt from the crankshaft journal and the crankcase bore using a clean, lint-free cloth soaked in solvent naphtha or acetone.
      CAUTION: The crankshaft flange can be damaged if not cleaned correctly.

      • Leaks

      → Never use an abrasive or polishing cloth or brushes with metal bristles.

      → Follow cleaning instructions.

2. Remove any corroded spots on the crankshaft flange using a metal-polishing pad only (for example Nevr Dull, available in car and motor bike accessory stores).
   1. 2.1. Then, carefully clean the flange using a clean, lint-free cloth that has been soaked in solvent naphtha or acetone.
      NOTE: Drilling work on crankshaft sealing ring

      • Risk of engine damage caused by drilling chips
      • Risk of damage to the crankcase
      • Do not apply pressure while drilling

      → Carefully remove drill chips

      → Drill carefully

3. Drill holes in the crankshaft sealing ring at two directly opposite positions -arrows-  using a greased drill bit (ø 2 mm) and carefully remove drill chips.
   Fig 2: Locating Sealing Ring Drill Holes

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
4. Screw the extractor tip of the tool model G impact puller for sealing rings Nr.168-1 -1-  alternately into the bore holes -arrows-  and pull the sealing ring out evenly.
   Fig 3: Pulling Out Sealing Ring

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
   1. 4.1. Alternatively, screw two tapping screws into the bore holes.
   2. 4.2. Pull sealing ring out alternately using slide hammer kit Nr.168 -1-  at the tapping screw.
      Fig 4: Tapping Screw Using Slide Hammer No. 168

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.

      Information 

      Visually inspect the crankshaft flange and crankcase bore for damage.

5. Check crankshaft flange and crankcase bore for damage.
6. Clean the camshaft flange again using the metal-polishing pad, if necessary.
   1. 6.1. Then, carefully remove grease from the flange and crankcase bore using a clean, lint-free cloth soaked in solvent naphtha or acetone.
   2. 6.2. Leave to dry off for at least three minutes to ensure that the vapors of the cleaning agent do not attack the new sealing ring (sealing lip).