Removing Sealing Ring

Information

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

Fit a 3-mm drill bit in a battery-powered screwdriver or power drill. Grease drill bit lightly so that any chips produced will stick.
1. 1.1. Drill two bores at the front of the crankshaft sealing ring -arrows- .
  
  Fig 1: Locating Bore Hole Positions On Sealing Ring
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Screw the threaded tip of the tool impact puller mod. G for sealing rings Nr.168-1 alternately into the two bores on the sealing ring and drive out in direction of arrow → Using impact puller using the guide weight .

Fig 2: Removing Sealing Ring Using Impact Puller
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
1. 2.1. Alternatively, screw a tapping screw approx. 5 mm into the bores and remove the sealing ring using the slide hammer kit Nr.168 .
  
  Fig 3: Pulling Out Sealing Ring Using Tapping Screws
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
2. 2.2. Soak up any escaping engine oil with a cloth.
CAUTION:
Crankshaft flange not cleaned correctly
- Risk of leaks (loss of engine oil)
- Risk of corrosion
→ Never use an abrasive or polishing cloth or brushes with metal bristles on the crankshaft flange.

→ Follow cleaning instructions.

→ Remove corroded spots using a metal-polishing pad only (for example Never Dull , available in car and motor bike accessory stores). Then, carefully clean the flange and crankcase bore using a clean, lint-free cloth soaked in solvent naphtha or acetone.
Clean crankshaft flange and crankcase bore carefully.
Information

Visually inspect the crankshaft flange and crankcase bore for damage.
Check crankshaft flange and crankcase bore for damage.
The sealing faces must not be damaged.
1. 4.1. Small burrs can be removed using an oilstone (not on the sealing faces). Then clean thoroughly with acetone or solvent naphtha.