Remember the knocking sound on my Hunter 33.5? Well, it looks like the motor mounts are the culprits. The Yanmar tech pointed out the different heights on apposing corners, as well as the rubber starting to disintegrate. The boat is 17 years old, and he suggested changing all four, even though all four are not quite finished with their life. It's kind of like pay me now or pay me later. The hard part is the mounts are about $100 each. Yikes! With the engine running and in gear at the dock, he pulled up on the stuffing box and the knocking went away. An engine alignment after changing the mounts should do the trick. On the matter of loosing oil, he found a few small leaks on the engine, such as the gasket on the fuel pump, O-rings on the head cover screws, and maybe even the gasket on the head cover. He also pointed out hoses that should be changed out if I felt I could do it myself. The water heater hoses are chaffing as well as the exhaust hose between engine and muffler. I'll report back after items are changed with the end results. Keeping my fingers crossed.
