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How do a seperate the lower unit on a 2000 40 hp yamaha

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On the lower unit you have a side plate to undo the gear connection.It may be near the upper housing.Then you have the g/box nuts.Undo all of these.Now all of these are off,the lower unit will drop.If not,a rubber mallet softly around the sides of the lower casing.The g/box nuts are below or near the flat cavitation plate.Not the ones near the propeller.Lower it gently and watch where the water pump tube goes.Whilst the g/box is off,I would do the water pump.Its 4 bolts and takes about 20 minutes.The parts are cheap and worth doing while the box is off.Make sure a high temp grease goes on the top of the driveshaft before it geos back in.Hope this helps

Posted on Sep 27, 2009

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