Lower Unit Oil Drain Plug Screw Kit – Fits Mercury/MerCruiser Outboard & Sterndrive (Replaces 79953Q04, 816610A1) family-yamaha-f15seha Clean all surfaces with a

Clean all surfaces with a wire brush and marine-safe solvent

so replacement is often the most reliable diagnostic step

Disassembly: On a clean workbench

Install the new gasket or O-ring on the cover plate

Replace Thermostats: Locate the thermostat housings and remove the old thermostats

Lower Unit Oil Drain Plug Screw Kit – Fits Mercury/MerCruiser Outboard & Sterndrive (Replaces 79953Q04, 816610A1) family-yamaha-f15seha Clean all surfaces with aLower Unit Oil Drain Plug Screw Kit Fits Mercury MerCruiser Outboard & Sterndrive This lower unit oil drain and fill plug screw kit is designed for a wide range of Mercury MerCruiser applications, including Alpha One (Gen II, I, R, MR) and TR TRS sterndrives. It also fits all Mercury outboard models that use a 3 8" 16 non magnetic drain fill screw. This kit serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury