Re: 3hp OMC crankcase question Home › Forum › Ask A Member › 3hp OMC crankcase question › Re: 3hp OMC crankcase question outbdnut2US Member - 1 Year (includes $3 online payment fee)Replies: 1705Topics: 91 June 30, 2018 at 9:02 pm #78754 I didn’t know about those dots either! I’ve done several by trial and error. Dave