I have a 1987 Bayliner with the 2.3L OMC + Cobra sterndrive. Generally its been a terrifically reliable engine but I've learned to pay attention when it starts making noises. Like last weekend when we noticed something new.
Every once in awhile (say 5-10 minutes of operation but growing in frequency) the boat will make an audible thunk noise while we're cruising. At the same time the boat will lurch slightly as though you've hit something like a log in the water. Over the course of the weekend we've noticed this went from once on friday to once every 5-10 minutes of operation on sunday. We stopped using the boat the moment we realized this was happening but I'm at a loss to guess what it could be (or more importantly how much it could be!). I'm guessing its transmission related as the mounting seems secure and the transom appears intact.
Anyone have any suggestions?
Every once in awhile (say 5-10 minutes of operation but growing in frequency) the boat will make an audible thunk noise while we're cruising. At the same time the boat will lurch slightly as though you've hit something like a log in the water. Over the course of the weekend we've noticed this went from once on friday to once every 5-10 minutes of operation on sunday. We stopped using the boat the moment we realized this was happening but I'm at a loss to guess what it could be (or more importantly how much it could be!). I'm guessing its transmission related as the mounting seems secure and the transom appears intact.
Anyone have any suggestions?