Hello, John Talley here with Boats.net. Today we're going to be replacing the
water pump on our 40 horsepower four-stroke Mercury outboard. As you can
see, we've already got the lower unit separated. Now if you need help doing
that, why don't you check this units playlist and I can walk you through the
process, it's not that tough. So let me go grab a couple of tools, show you the
parts we're going to use, and then we'll dive into this. Now what I've decided to
do instead of just replacing the impeller itself is I went with a water
pump repair kit. And with the kit you get all the gaskets, the different wear items,
water tubes, etc. That way you can be sure you'll have all the pieces that you're
going to need to pull it back down and then get it back together correctly. Well,
now that we've got our parts set aside, let's go grab a couple of hand tools and
we'll get this thing pulled apart.
Pretty simple guys. We can go ahead and get this pickup tube out of the way. Then
you just have four bolts holding it in place. I know that this engine that's
been sitting for a while, so I'll be very curious to see what kind of shape this
impeller is in. I'm betting that's gonna look pretty crunchy in there. Should just
be able to lift off. Yeah, there she is. The wear housing looks okay.
Impeller's not in horrible shape either. It's one of our nylon washers and then
other ones down at the bottom. Now we go and lift out our wear plate. Alright
guys, this wasn't part of the original plan, but this front boot is looking
really rough, so I'm gonna go ahead and replace it because this just a matter of
time before it starts to let water in there. So let's go ahead and cut the zip
ties, get a new one popped on there, and then we'll finish out the water pump.
Alright so there's just a zip tie down here. She should just lift off. Yep. Make
this a little bit easier, we're just gonna spray it now with some silicone
spray.
She's gonna slide right down.
All the way down into that groove. There she goes
Alright, that knocked out, let's go ahead and get our water pump put back
together. Let's get our base gasket in first.
Get on our wear plate. And this gasket you want this a neoprene side
facing up-- that little gray area there is only on one side. So we've got the first
nylon washer that goes down here and then we got a little bit of grease on
the backside of the key. Get our key in place. Now we can bring down the impeller.
Line it up with the key. Your second nylon washer goes here. Now we're going to take
a little bit of grease, put it inside this housing. It doesn't have to be super
thick. We just don't want it to run dry on startup. And we're going to put a
couple of dabs in here on the wear plate. Don't have to get
carried away, this is just for startup because it's got a draw water up into it.
And we're going to lower the housing down and when we get down to the impeller,
we're going to turn this clockwise so that the veins are pointing in the right
direction.
There we go. Now we're gonna get our bolts, a little red loctite on each one,
and get them tightened down. And the book it says to take these two 60 inch pounds,
so I guess that's what, about five? I'm gonna use my internal torque wrench to
do that. Last piece, we just need to get this water pickup tube on it.
Well alright guys, that's gonna wrap this one up. The only thing I have left to do
now is just get it remounted to the power head. And listen, if you need help
doing that, why don't you reference this unit's playlist. That way I can walk you
through it step-by-step, it's not that tough to do. Listen, if you need these or
any other parts for your boat, why don't you come see us at Boats.net and we can get
you taken care of. If you like what you see in this video and you want to see
more, go and hit that subscribe button that way you'll be notified and you can
keep up with whatever I'm working on next. We just want to say thank you for
shopping here with us at Boats.net and we will see you in the next video.
Y'all have a great day.