Porsche 996 TT Repair Manual page 493

einordnung
of the second ring groove must be between the gap of the stepped taper faced ring. Insert the taper
faced ring into the ring groove in such a way that the designation TOP is pointing toward the piston
crown.
6. Check that the piston ring is correctly seated and positioned. Make sure that the oil scraper spring is inside
the oil scraper ring. In terms of the piston ring in the ring groove 2, the twist lock must be on the inside of
the gap and the designation TOP must be pointing towards the piston crown. The highest piston ring must
be installed in such a way that the designation TOP is pointing towards the piston crown. The gaps of the
individual piston rings must always be offset by 120°.
996420, 996421, 996450, 996451, 996620, 996621, 996650, 996651, 996840, 996841
Installation 430