Hello John Talley here with Boats.net. Today I'm going to show you how to
reinstall the lower unit to our 40 horsepower four-stroke Mercury engine.
And we've already done several procedures to this lower unit, and if you
need help with yours, I want you to check out that playlist. I pretty much bet
we've already done it. So let me go grab a couple of just basic hand tools and
I'll show you how to get this thing remounted and hooked back up. So let's go.
Before we unbolt it, let's go ahead and get some grease on the input spline and
then just a little bit on this water tube where it installs a little bit easier.
And when you bring this over, make sure you've already got access to one of
these bolts so it'll hold it in place.
And away we go. There we go. But when you're doing this, make sure you can push
it all the way up just by hand. You don't want to use the bolts to pull it into
position, because if you're having to do that, you're doing it wrong and you're
gonna end up either bending or breaking something. We're just going to bottom
these out, then we're gonna come back and torque them. Now let's go ahead and
torque down those four, and we need to take it to 40 foot pounds. Now the front
two are easy because the torque wrench can get in there without a problem. But
now what do we do about this? Let me show you a special tool that'll help
straighten that out. This little guy right here will attach to a regular box
end wrench and then allow you to go to the torque
wrench. Now the real trick with this one is, as long as you're at a 90 degree
position from the wrench itself? You can just use
the regular torque values. Now if you go off of that 90 degrees, there's a formula
that you have to use to calculate what the foot-pounds should be. And it doesn't
matter which distance you are here. That has no bearing on it. Make sure we're at
90 degrees. And now... pretty cool, huh?
There we go. Which is a 15 millimeter. This one is 40
foot-pounds as well. A little grate right here, and you get it back in. Now we can
get our new trim tab on there because the other one was broken, if you remember. And
we're just going to set it at a zero because we don't have a point of
reference on this one-- or the one that came off because it was broken. And this
one is gonna be 16 foot-pounds. Next let's go ahead and lower it back down,
we'll get the shift shaft reconnected, and then will pretty much be done with
this one. Alright, what we're doing is we're gonna take that pin right here and
put it into the top of the shift shaft. It looks like it's fairly close but
not quite. Oh there it goes. All we did was just
slide the pin in and now we just take, take it and rotate it down. Locks it
in position. Well alright guys, that wraps this one up.
Well listen, if you need any parts for your boat, why don't you come see us at Boats.net
and we can get you taken care of. Have any questions or comments? Leave them in
the section below and I'll do my best to answer them. If you like what you see, 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. Y'all have a great day.