Lower Unit Oil Drain Plug Screw Kit – Fits Mercury/MerCruiser Outboard & Sterndrive (Replaces 79953Q04, 816610A1) family-yamaha-f15seha Replace Thermostats: Locate the thermostat

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

so replacement is often the most reliable diagnostic step

Brand Part Number Mercury 47-89980T1 Mercury 89980Q1 Mercury/Mariner 47-89980Q1 Sierra 18-3446 Compatible Engine Models

clean if necessary with a lint-free cloth

Lower Unit Oil Drain Plug Screw Kit – Fits Mercury/MerCruiser Outboard & Sterndrive (Replaces 79953Q04, 816610A1) family-yamaha-f15seha Replace Thermostats: Locate the thermostatLower 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