Stickboy
28.04.2021 2:34:23
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you should also think about getting a pump(screws into the bottom hole in the lower unit)..they only cost about $15 but are really handy and make it alot easier and not as messy..Hang on to the pump so you will have it for the next oil change..
Jeff, if you have so little experience you really need a Service Manual. Helpers here can help you use the Manual, but are not a substitute for one.
Re: 90 hp lower unit oil change question
pretty simple really, but a manual will certainly help, a basic rundown is: get a suitable contaner to drain oil into, remove both plugs, the lower one and the top one, drain all oil, look for any suspicious metal bits in the oil and on the magnet, buy two bottles of the correct oil, fit pointy end of bottle into lower screw hole and sqeeze bottle untill you have squirted as much as you can in, get the second bottle and repeat untill oil flows out of top hole, replace top screw, the seal created will preven too much leaking out the bottom, refit lower screw and your done, it also pays to replace both washers under the screws.
Re: 90 hp lower unit oil change question [links]
Re: 90 hp lower unit oil change question
My hypothesis is that someone needed to "borrow" some of our lower unit oil and unscrewed the plugs. Since the motor is stored tilted up and cranked over to port (to keep the steering push-pull rod from being exposed, per the manual), if someone pulled the top plug in that position, oil would pour out the top hole and down the side of the lower unit right over the pitot tube hole. At least, I'm hoping that's the case. :?
I need some reassurance from the forum here. First, a little background, then my question. A few weeks ago I stopped by the boat and noticed there was lower unit oil leaking from the bottom plug and an oil stain on the ground. My first thought was crap, that's been loose since the last time the motor was serviced a year ago, so we've sucked up a bunch of water. So I tightened up the screw (got a good 1/4 turn on it), and left it to go get some new oil.
It was a couple weeks before we were able to get back to it. So we lower the motor to get it as vertical as possible before hitting the ground and still allowing us to get an oil pan underneath. As the motor tilted down, oil started pouring out of the pitot tube hole, and I started to panic wondering why that is. It stopped after a few seconds, but there was a significant amount of oil that came out. Enough to drip down the side and into the pan. Maybe a couple ounces?
We then proceed to pull the plugs. I was expecting coffee with cream to come out, but the oil looked perfectly clean and new. It was the exact same color as the new oil we put in. We also discovered the top plug was loose as well, and only about 25 ounces of oil came out. We're supposed to take 33.1 ounces. We went ahead and changed the oil and put without any issues.
So my question is, how could oil get into the pitot tube hole? The lower unit was obviously sealed up tight all last year, since no water got in over [links]
Does anyone else have any ideas how oil could get in the pitot tube hole?
Fill from the drain hole til it comes out the vent hole, put the vent plug in and then the drain plug in. [links]
Re: Simple Question: Y-90 lower unit oil change more
Loosen the vent plug to relieve any pressure, remove the drain plug and then remove the vent plug and let the gearlube drain. here
I know this question is too simple, but I can't seem to find instructions for changing the lower unit oil on my '85 YAM 90HP. Would someone please point me to a link or provide the step-by-step.
Re: Simple Question: Y-90 lower unit oil change here