Re: Changing Lower Unit Lube?? How To (1986 - 90HP EV)
Welcome ShadO!<br /><br />Basically, with the engine straight up and down, you pull the drain plug and vent plug and drain it out. Fill through the drain plug until the lube comes out the vent.<br /><br />Now....(always a "now")...couple things to look at.....let the engine set straight for a few minutes before pulling the drain plug. Get a clean container to catch the oil in so you can take a look at it. When you losen the drain plug, pull it out a little and see what comes out first....meaning water or oil. A couple drops of water is common....but if the water flows a lot before the oil comes out, you could have a leaky seal.<br /><br />With the drain plug out, take out the vent plug and let the oil drain into the pan. Once drained, take a look at the oil. Look at the color, is it black and stinky or look fairly clear? Is it milky in color? Mikly oil indicates possible water intrusion into the lower unit. Is it clean oil with do metal flakes?<br /><br />Put new washers or orings, what ever your drain/vent plugs are equipped with on the plugs before filling. This ensures the plugs won't leak.<br /><br />If you like what you see, fill the lower unit from the bottom fairly SLOW. This will let the air escape out the vent. When you see lube coming out the vent, replace the vent plug first. Then with the drain plug ready, remove the fill bottle and screw in the drain plug.<br /><br />Shouldn't take but a few minutes to do the job. A large screw driver helps the process.