Mercury Mariner Counter Rotation Gearcase Sliding Clutch 52-854735T 52-859340T Water Pumps This is the old style

This is the old style that uses the 2-piece rear oil seal

12-27807 Washer

Item Details This is off a 1978 25hp Evinrude

They made all sorts of revisions to these outboards over quite a number of years

12-24548 Washer

Mercury Mariner Counter Rotation Gearcase Sliding Clutch 52-854735T 52-859340T Water Pumps This is the old styleItem Details Overall Good condition, normal wear on this, removed from a fully functional drive. Freshwater used part Part Numbers Included Sliding Clutch 52 859340T 52 854735T 52 828288 Shift Spool Assembly 19755T7 19755A7 Spring 24 30893 Cross Pin 17 30632 17 8M0020941 Compatibility Mercury & Mariner Outboards with counter rotation drives generally 135hp Thru 225hp models 1996 & newer, but please check your parts manual as they did eventually