Term: Lower Unit Gearcase Gear Housing Image: [{"name":"images\/public\/dictionary\/Lower Unit Gearcase Grease_tiwxkaj6.jpeg","usrName":"Lower Unit Gearcase Grease.jpeg","size":121013,"type":"image\/jpeg","thumbnail":"images\/public\/dictionary\/thLower Unit Gearcase Grease_9wb3qcdq.jpeg","thumbnail_type":"image\/jpeg","thumbnail_size":36045,"searchStr":"Lower Unit Gearcase Grease.jpeg,!:sStrEnd"}] Definition: It provides mechanical support for the moving components, a mechanical protection from the outside world for those internal components, and a fluid-tight container to hold the lubricant that bathes those components.