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Welcome back to another video guys. Today we're going to service a Yamaha lower unit
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We're going to change the impeller and the vertical drive shaft seals. Enjoy the video and I hope this helps you out
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When you go to do your lower unit you want to tilt it up like this
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There's one drain plug here, one drain plug there. And there's four 12 millimeter bolts to the water pump housing
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housing. You'll think this water pump housing off. Yeah, I've got two O rings in there. There's one here
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And then one that goes around here. Make sure both those are in there and they're set properly. It is easier to leave this metal cup on here to use to pry to get this metal piece off like that
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And then you can pull this housing. off. A lot of times the impeller
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will not come off with that, but this time it did. Take this metal
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plate and put this in here. Set it down. If you look, right here
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There's two tabs. Make sure those seed in there properly. And then you also have these three rings
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If you look, one of them is curved. You want to make sure the curved one is in between the two flat ones
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And then this plastic cup goes on top of there. The metal cup goes on top like that
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This woodruff key right here, a lot of times it will not come off
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So you're going to want to take a chisel with a really fine point
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and get it in there like this, then you'll hammer it. This one is loose, so we don't need to do that
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But if it is stuck, you want to make sure you use a fine chisel
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or else you will shear the pin off, and then you've got to get heat to get it out of there
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Once you get the water pump housing and the ampillar everything off, you can take a shrew driver and pop this plate up with the gasket
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You're going to want to take the gasket off and throw that away. be able to scrape this gasket off here
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And then what you going to want to do is get on a wire wheel and clean this off And here you have your drive shaft seals There a top seal cover
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So when you pull that up, you're going to inspect it. And if it's got buildup like this, or if it's split at all, if you can take your finger
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like this and roll it over, then you want to throw it away and get a new one like that
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If you can do that, you need to put a new one on. When you look in here at these drive shaft seals, if you can see the spring is rusted
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and broken, if it has any rust on it all, it's the spring that fails and you don't do your
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water pumps as often. You want to replace these seals because they will leak and once the water gets in the lower
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unit, you can blow it up. These four bolts are 12 millimeters on an OEM Yamaha on an SEI, they are half inch
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you go to take this out the best way is to get two big screwdrivers on each side of it
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Once you get your two screwdrivers on both sides, you want to pry down on both of them
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To get it to release. Moving on to get these seals out, you're going to want to take another big screwdriver, get the tip under like that
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Do not put it too far because you can screw. because you can scratch this housing with this in a vice you apply pressure and sometimes they
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are and they're good okay there's one now that we've got one out let's get the other one same thing
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I'll put it in there and just back it up just a hair so that way you're not
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scratching the housing carrier
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That's how you get both the seals out. You want to make sure you clean this real good
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You're going to want to take a razor blade like this and just scrape around it
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These are your drive shaft seal. They're very common on a lot of models
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We have this all cleaned out as best you can. You take this seal with the spring facing up
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You want some kind of a gasket sealant compound. You're going to put it around the rim
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Set it down in there, get it started. Then a one and a quarter socket works really good
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There you go. Just get the ceiling around the outside rim. Set it down on there
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Get a set, take your socket, press it down. You shouldn't have to hammer it if you clean it real good and get the ceiling on there
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You should be able to just take the butt of the socket and push it down by hand and then
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you're going to take a rag, wipe this sealing off and then we're ready to put it back on
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Putting this back on, make sure that this hole right here, you want to grease that O ring real nice
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But that hole right there, you want it to face down like this
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that way it faces that hole right there. And then you just slide this down in here like this, get it set on there
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Once you get it set on there like this, push it down
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Make sure it seats all the way. Now we're ready to grease our bolts and put it back together
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Again it is very important that you grease all these bolts when you put them back in, get them started by hand
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And then once you get them started by hand, then you can run them down to work. Before you put this seal on here
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on this cover, grease that up real heavily and it will help preserve
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that spring. And it will also help from getting that buildup in there
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that messes this seal up. Put that on there. With that, this tab facing aft
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So it goes right like this. Then on there like that. And then we've got this nice clean plate
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Then we've got all cleaned up. Slide that on down in there
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And just slide that down like that. And you're on there. For this woodruff key, you put a little grease in there
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You can grease that up like that. Once you got that greased up, you can take this woodruff key, stick it in there
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and that'll hold that key in there so you whenever you put the impeller it'll slide over
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if you look at that right there that little bump that lets you know what vein your wood drift key goes on to that little mark there We just slide it down Once you get it
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slid down, you need to be careful of the woodruff key and make sure that you get it in there
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With the end pillar on there, we could put our three rings on there. Remember that the wavy washer goes in the middle of the two flat washers
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Before you put your plastic one on there, I like to put some grease on there
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And then you just slide your plastic one down there and it'll fit in that groove like that
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Before you put the metal one on there, I like to grease this up too. It helps it slide down on there
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You can take this and push that down like that. And then once you push it down, You're going to want to take a hammer or something and just tap it down
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Okay, now we're going to push down this housing and turn clockwise with the this
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The drive shaft. Until the housing sits down nicely
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We're going to breeze our bolts and now we're done. When you're filling up the gear case, you want it to be tilted
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back. If you can see this is tilted slightly like this. That is because whenever you fill it
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from the bottom here, you want this cone shape here to be pointed like this. So if there's
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any air bubbles back here, the gear loop will push the airwoles up like this and out up to the
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vent. We fill it from the bottom until it comes out the top. Put the top screw in first
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And then once the top screws in and tight, then we'll take this out and put the bottom
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bottom went in. Get your two screws ready. New gasket's on there. Make sure that the old
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gaskets are out and any little piece of the old gasket isn't in there. We're on the
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board. Now the gearcase is full of loop. You want to make sure before putting it on, you
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grease all these pins, your shift shaft, your drive shaft, your pin, and your gaskets
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Rubber seals. Grace everything so that way you can take it off in two years or
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hundred hours, three hundred hours, wherever you do your intervals. All right, guys, that's going to conclude our lower unit service
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I hope this was helpful. If it was, please don't forget to like it and subscribe for more videos
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and we'll see it on the next one
