OMC Parts Drawing *Cobra *Mercruiser *Alpha SEI Outdrives
Updated April 29 2026
P/N 22660
Lower unit Johnson gears with 3 jaw clutch dog. Sierra 18-2210.
Fits 2 cylinder 40 – 50 hp newer style small housing. Loop charged motors ( 1989 – 2005 ) see below for specific models. 12/29 ratio.
P/N 22663
Clutch Dog
3 Jaw
Replaces OEM 332491, Sierra 18-2308
P/N 22661
Evinrude Johnson gears Pinion / forward set
See above for compatible models. 12/29 teeth, 2.42:1 ratio.
Replaces OEM 397627, Sierra 18-2310, Mallory 9-73511.
Click here for all 2 and 3 cylinder lower unit seal kits
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