Removing Crankshaft Sealing Ring

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 -1-  :

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Crankshaft sealing ring on flywheel side

1. Spray sealing face of sealing ring with anti-rust agent (e.g. WD40).
   WARNING: Caustic fluids 

   • Danger of chemical burns 

     → Wear personal protective gear.

     → Ensure that there is good ventilation.

     → Avoid contact with caustic fluid.

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

2. Carefully remove smaller edges or burrs on the chamfer of the crankshaft flange with an oilstone if necessary.

   Then, carefully remove metal chips and residual dirt from the crankshaft journal and 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.

3. If there are corroded areas on the crankshaft flange, only use a metal-polishing pad to remove these.

   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

4. Drill holes in the crankshaft sealing ring -1-  in two opposite positions -Arrows-  using a greased drill bit (ø 2 mm) -2-  and carefully remove drill chips.

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Boring the sealing ring

5. Pull out sealing ring.

   Screw two tapping screws (Ø approx. 3 mm, length approx. 30 mm) into the bores.

   Pull sealing ring off alternately using > VAS 6965 - Puller set  at the tapping screws.

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Tapping screw with slide hammer kit no. 168

   Information 

   Visually inspect the crankshaft flange and crankcase bore for damage.

6. Check crankshaft flange and crankcase bore for damage.
7. Clean the crankshaft flange again using the metal-polishing pad if necessary.

   Then, carefully remove grease from the flange and crankcase bore using a clean, lint-free cloth soaked in solvent naphtha or acetone.

   Allow them to air for at least 3 minutes.