Mercury - 100 Hour Maintenance Kit MerCruiser V6 & V8 Sterndrive/Inboard Complete Service Components 8M0147051. Overview. Most boaters will tell you there is nothing quite like the comfort of an engine that fires up instantly, settles into a smooth idle, and pulls strong the moment you ease the throttle forward. That kind of confidence is earned through consistent care - the kind that prevents problems long before they appear. The Mercury 8M0147051 100 Hour Maintenance Kit brings that peace of m