The Oil level in the bottle and a general inspection of the engine compartment should ideally be checked at the start of each trip or at least once a week to see if you are consuming Drive Oil. Rather that drain the whole system, I'd like to just top off for now. If the Monitor Bottle was empty or upside down you should have had an Alarm sounding in the dash, warning that the bottle was empty. When the lube is done draining, take some time and inspect the drain and vent holes for the old gaskets. If possible, run the engine on the hose until the drive warms up a little. Mine is in a bracket that requires that you remove bolts to free the bottle.
I was thinking it somehow makes its way down to the stern drive but I'm not sure how? Use a sharp pointy pick and make sure to remove the old drain plug gaskets from the drain and vent holes. Check the wiring to the float switch in the bottle for problems. You can never be too careful. If you find water in the drive. My understanding is the there should be no oil in the bevels, not sure if there is some other place it makes it's way down. You will notice that oil will drain very slowly.
Once the Vent Screw is removed the oil will drain much faster. If you have found water in the lube, or if you suspect the drives seals are leaking, you should pressure test the drive while it is empty. We currently specialize in sales and installation of lower units and bow thrusters. Moving parts can rip off your fingers. This is made easy with the use of a Gear Lube Pump. It is specially formulated to work well with the Bravo style cone clutch system. This could very well be the reason you have a Fried Stern Drive.
Change the lube every year or sooner if you suspect a problem. Water will rust the bearings, races, gears and shafts and it will ruin the drive in just a short time. If there was no oil in the bilge or in the bellows then you missed a leak by not checking under the hood. This article has also been viewed 169,721 times. It normally has 4-6 ounces in it. Usually drives are resealed every 5 years, less if you have overheated your engine.
Look in the bottom of the bottle. The metal bits add to the process and soon the gears, bearings and shafts fail. And that the seal between the first prop and second prop is getting worn. Thread the end of the pumps tube into the lower gear housing drain hole and pump the lube into the drive. Let the lube drain out for a good 15 to 20 minutes. I have the same problem with my one of my Bravo 3's outdrive. It will drop down from the full line to the add line after about 8 hours of running.
All just another reason to inspect the equipment regularly. Waiting will make the damage worse. The hose comes out the bottom so pushing it out top is not an option. Old gaskets get brittle and hard as rock. Remove the pumps fill hose and install the lower plug making sure the new gasket is in place. My question is where does this oil flow to? He doesn't recommend changing it yet unless its really getting sucked out or if it starts leaking while it's just sitting there.
These units are new, not remanufactured, which means it has no wear and tear yet. Wipe up the mess and discard the pan of old lube properly. When water gets in the drive it tends to condensate on the top bearing. Mercruiser Sterndrive Information White Streaks in your Gear Lube White streaks are an indication that you have water in your gear lube. Just top off the bottle with clean lube and keep an eye on it.
Rarely does one just replace one seal. Schoonveld earned a Master Captain License from the Coast Guard. The Mercruiser Premium Gear Lube looks translucent caramel in color. Properly maintain your Mercruiser sterndrive. Just changing the lube will not fix a drive! You might turn an expensive repair into a much more expensive repair.