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How do you change oil in a 1980 15hp evinrude

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The only oil is in the g/box.On the gearbox itself,there is a large screw located on the lower half of the gearbow.Below the line of the propeller.Remove the screw.Carefull not to loose the washer/seal.Now,up higher there will be another screw the same as the 1st.This will be located on the side of the gearbox.Remove this screw as well.Let all the oil drain.If the oil is a milky color,the propshaft seal is damaged.Thats a new job alltogether.Anyway,with the new oil,you have to put the oil in through the bottom hole untill it comes out the top hole.The bottle has a tapered spout on it and you squeeze the bottle to get the oil in.When the oil comes out the top hole,its full.Quickly put the bottom screw back in.Then the top screw.Its also a good time to remove the propeller,regrease the prop.shaft and check there is no fishing line etc. caught around the shaft.It damages the seal.Hope this helps.

Posted on Jul 19, 2009

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