okay i have a 1987 3.0 merc the was recently rebuilt, ran fine first 4 or 5 time out butt now under payload it makes a slight unconsitant ticking sound , doesn;t realy affect power or anything, so i cheked the exhaust for leaks put a new shutter in and sealed the manifold back up, the engines oil was around a quart low topped it off. Now if that doesn;t work i was told it is most likely my valves need tightning my question is there a specific tourqe for the valves or should i just snug them up? or does anyone have other sugestion to what that ticking may be.(if i take the airfilter off the carb it kinda sounds like it is coming from that area.
