Porsche 2012 911 GT3 CUP Technical Manual page 34

3. After extracting the metal ring the actual seal remains in the
crankcase. Under no circumstances whatsoever must this be levered out.
4. Carefully remove the drill swarf
5. Carefully drill two further 2.0 mm holes (arrows) as close as possible
to the corners (metal body) of the seal.
6. A thrust ring is fitted behind the crankshaft seal which should prevent
the possibility of the seal being fitted inclined. Aluminium swarf which may
appear during drilling should be carefully removed.
7. Remove the seal, there are two procedures for this
a.) Screw the threaded end of the slide hammer alternatively into the
bores and extract the seal evenly.
b.) Screw in two self-tapping screws and extract evenly with the claw
fitting of a slide hammer
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