1995 Mariner Mercury Outboards Service Manual 50HP 4-Stroke, Page 222Get this manual
Gear Housing Removal To prevent accidental engine starting, remove (and isolate) spark plug leads from spark plugs before removing gear housing12Remove (and isolate) spark plug leads from spark plugsShift into NEUTRALMake scribe line showing alignment of trim tab to gear case and remove trim tab bolt and washer