Hello, John Talley here with Boats.net. If you’ve been keeping up with this video series, you know that we’ve already
taken off the heads on our 2004 Yamaha F225. Now it’s time to turn our
attention to the bottom end. There are no special tools or parts that are going to
be required or that we use in this video, so if you’re ready, let’s go ahead and
jump straight into it. We’re gonna start on the side by getting this cooling
cover. I’m gonna spin it around and then we’ll start taking off the crankcase
cover as well as the crankcase lower half of the crankcase assembly. At that
point, we start pulling the pistons out. Once again, these are numbered in a
sequence. If you were actually installing it, we’re doing the opposite. So we want
to find the highest number and work our way down and looks like 13 is the highest.
A couple of different pry points. We can get our filter housing out of the way. Next let’s go ahead and get our oil fill
and our linkages removed. So we have 17 total, so we’re gonna we’re gonna start
right there work our way back. Let’s go. Now let’s go ahead and bring off this
windage tray. Alright guys, what we’re going to be doing here is just breaking
the bolts loose on the connecting rod caps. Go ahead and remove the cap. Make sure
you grab the bearing because it’s gonna have a color on it. At that point we’re
just going to take a long extension and reach all the way up to the base of the
piston and go ahead and pop it out of the bore. Just make sure you’ve got your
hand on the other side actually catch it so it doesn’t dump out onto the floor.
We’re gonna do this guys, just take this long extension go all the way to the
bottom of the piston, and pop it. Now you can tell when the motor stopped
and sat for obviously a long time. You can see where each piston was because
you can feel in there and actually feel where it’s rusting. That’s actually a
hump at each location. All the way down, this one’s about mid almost two-thirds
of the way up. This one was about right here. Same thing on this side. Here, here,
and then down at the bottom. So this engine sat for a long time. And what has
actually happened to it, we can’t see it without cutting it apart, on the exhaust
down at the bottom it is eaten so far it has actually gone into one of the oil
passages and that’s why when you tried to fill it up with oil and we were cranking
it over doing the compression and the leakdown test, oil was actually dumping
straight into the exhaust. So this block is trashed.
I think we’re going to be able to reuse the crank, we’re gonna pull that in a
minute to make sure it’s okay. Connecting rods look okay. I’m not going
to reuse the pistons, so we’ll be replacing those as well as the rings. And
it ended up– then we’ll end up just building it all from scratch. On every
other section of the engine they give you the sequence to either install or
remove all the bolts. It’s set for this one, but I’m going to mark how to do it.
But basically, it starts with these outside bolts and you’re just running
back and forth, working your way in. And then you do basically the same thing to
get your mains loosened up. So I’m gonna grab a pen and go ahead mark these just
for fun so you can keep up with it. Number one, two, three down, four,
five, six, and seven down here. 8, 9, 10, 11, 12, 13. That should be all of
them around the outside perimeter. I’m gonna buzz them out using the impact now that they’re broken loose. So we’ve got our 13 millimeter, let’s keep going. 15, 16, 18, 19, 20, 21, where’s 22? 23, 24, 25, 26, 27, 28. Ok guys, so
basically we’re gonna leave it in the stand, we’re going to go ahead and
separate the lower half of the crank case from the upper half, and we’re gonna
leave the oil pump in place and that’ll keep the crankshaft from
actually falling out. And once we’ve finished separating the lower and upper
half of the crank case itself, then we can lay it over on a table, I can take
off the engine stand, and then remove the oil pump. Alright guys let’s go ahead
and get the oil pump off, then we should be able just lift out the crank
and we’re pretty much done breaking this one down. There we go. Making a mess now. Alright
guys, she’s broken down all the way and what I did is I removed this cap that
exposes one of the old galley ways and I want to show you now what killed this
block. Corrosion is eating it up to the point in the exhaust that it ate up into
that galley way. And what I’m gonna do is just shine a flashlight from up above
and then with the other camera you can see light coming through. So that level
of corrosion has destroyed this block and there’s no way to fix it. So where
does that leave us? Now what’s gonna happen next, I’m gonna go order a bunch
of parts and then we’re gonna start methodically putting this entire engine
back together. I will try to use as many of the old parts as possible and only
replace what is absolutely necessary. At this point, I believe that we can get
away with just doing the block itself as well as pistons and rings and of course new
bearings. Well alright guys, I’m about to head back
to my office and order a bunch of parts for this project. Listen, speaking of
parts, if you need any through 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 and you want to
see me finish this out, why don’t you go and hit that subscribe button. That way
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. Have a great day.

Yamaha F225 Outboard Rebuild Part 3: Bottom End Teardown | Boats.net

4 thoughts on “Yamaha F225 Outboard Rebuild Part 3: Bottom End Teardown | Boats.net

  • July 30, 2019 at 2:31 pm

    This comes at the right time, currently doing the same thing for my 2005 f225. The corrosion exhaust issues are horrible. Thanks!

  • August 19, 2019 at 2:36 pm

    Hi John, I need to replace the exhaust on my 04 F225 Yamaha due to corrosion. I ordered the parts kit from Sim including a new oil pump. Do you have a video out doing this repair yet. Thanks

  • October 24, 2019 at 1:53 pm

    John, you are the man!!!!
    Sweet video(s)

  • October 25, 2019 at 2:27 pm

    Your videos are great!
    I know Yamaha is #1 and there are more Yamahas out there than any other manufacturer but could you do the same on Honda BF225?


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