Porsche 2012 911 GT3 CUP Technical Manual page 73

27. Mount the oil pump
5.10.4. Changing the selector barrel
1. To remove the locking pawl neutral latch and alignment pawl, unscrew
the selector barrel and lock, raise the selector barrel
When removing the barrel, make sure that the locking pawls,
springs etc do not fall out.
When replacing the selector barrel, the position of the barrel track
must be refitted in exactly same position
2. Place the old selector barrel, with spacer washers, on the special jig.
The barrel must sit correctly on the bearing spacer ring
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