Pinion Nut (5 per pack) replaces MerCruiser # 11-55910, Johnson/Evinrude part # 313339
For Small Gearcase 40-60 HP 2-Cyl. Loopcharged (1975-1988) 60-75 HP 3-Cyl. Loopcharged (1975-1988), Small Gearcase 40-50 HP 2-Cyl. Loopcharged (1989-2006), Large Gearcase 40-60 HP 2-Cyl. Loopcharged (1986-2006) 60-75 HP 3-Cyl. Loopcharged (1975-2001)