When I found our new to us 2000 FV270 the dealer had already noted that there was a leak in the drive oil reservoir line somewhere in the engine compartment. They suggested that the Bravo III system is notorious for it, but usually just a fitting or line issue. As part of pre-delivery they supposedly "fixed" what they thought was a loose fitting at the tank. After the first initial sea trial we noticed the tank had dropped about a half an inch from the full line which we attributed to air in the system working its' way out and topped it up. A second run of about 30 minutes a few days later, and no visible drop in the oil level. Went for a real good run of about an hour the other day, mostly at 3400 RPM and up, so working the drive pretty good. As part of my pre-operational check I noted that the reservoir was still at the full line, but another check after the run and it was all the way down to the add line. Not sure how much oil that represents, but at least a few ounces I'm sure. I did note some oil in the bilge and could also smell that maybe some oil was hitting the manifolds and burning off. I don't see any oil slick at the transom, although I guess it's possible that if a prop seal was leaking while under drive pressure, it might not leak much while stationary?
Weather has been nasty, but as soon as I can I'll wipe everything down, check what I can for leaks, top up the tank again, try another run, and see what happens. I'm hoping that the fitting has just come loose again, or something minor that I can easily fix. BUT......
If it is leaking somewhere on the "wet" side, is there anything else I can look for, short of hauling the boat and checking the drive oil at the foot? Would I see any signs of water siphoning back into the tank? (oil in the tank is good, no froth, no discolouration.) Is it possible that it's still just air working it's way out of the system?
A search here and elsewhere shows that it's a consistent issue, but ranging all the way from a leaky o-ring or fitting at the tank, to "oh my god, my drive bearings are shot"... so it's got me concerned.
"Knot Quite Shore"