exhaust leak

I’m getting a strong exhaust odor in both the cockpit and cabin while underway. And when motoring for > 2-3 hrs, a fine, black residue can be found on certain white surfaces in the cabin (e.g., on white plastic cups in an aft cupboard). I had a mechanic do an inspection of the exhaust system…he...

i recently had an engine exhaust leak near the transom of my Catalina 30 and now most areas in the lower cavity of the boat, from the transom to the engine compartment, are covered in diesel soot. What is the best way to clean this stuff off of wood, fiberglass, and the engine? Thanks!

"My 2010 6 HP Mercury developed an exhaust leak near the backing plate of the swivel mount. I took it to a local shop, which informed me that I will need two new bushings and the backing plate itself (because one of the bushings vulcanized and adhere to the plate so that they cannot clean it...