Have been recommended to this site by a friend of mine who also owns a RIB so hoping someone maybe able to help me and in the future I'll be able to do the same for someone else.
I have a 5.4M Avon Searider RIB with a 1995 Mercury 75HP 2-Stoke Outboard. The last time I took it out it suddenly stopped going into reverse and instead made a horrible shuddering noise (louder the more you put the throttle down). Having taken the boat out and flushed it through with fresh water using mufflers it went into both forward and reverse without an issue. Today I took it out again, started by flushing it through, it went into reverse perfectly
, I took the lid off the engine and checked that it when all the way in (a guy showed me where to look the previous week!) BUT once in the water no sign of reverse and the horrible shuddering again, with the lid off in the water I could see that it wasn't going into gear properly but I have no idea why it works when out of the water??
Any help would be greatly appreciate prior to me taking it to a garage and getting the "mmmmm, it's not going to be cheap discussion!"