Mercury Mariner 4, 5 102CC Sail 1990 Outboard Service Shop Manual, Page 19Get this manual
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5 With eng ine inForwa rd" gearfu lly adva nce throttl to .O .T position Use timing li ght and chec hat 30 .T .D .Ct imi ng mark (a) of fl ywheelis alig ned with crankcase cover cyli nder block split