Hello, John Talley here with Boats.net.
Today I'm going to walk you through the
process to change the oil and the filter
on our 40 horsepower Mercury four-stroke.
Not that tough to do. Just need one
special tool to pull it off, and that's
going to be an oil filter wrench. As you
can see, I've already got my oil filter
and the oil ready, so let me go grab a
couple of basic hand tools and we'll get
this knocked out.
Let's start by removing the cowling. Now
there are two techniques for getting the
oil out of this particular unit. One, we
can tilt it up and just pull this drain
bolt. Now if the unit happens to be still
attached to the boat and it's in the
water, well, there's an option to actually
pull the dipstick and then put a pump
into that tube and then extract it in that
direction.
Well since the machine is already off
the boat and on the stand, we're just
going to go with the tilt and drain bolt
method. An odd sized bolt, it's an 18
millimeter. We'll go ahead and break it loose.
Now to get this to tilt up, we need to
release the manual control valve over
here. It's right inside there, we want to
open it up maybe two to three turns. I'd
say that was it. Not looking too bad.
Let's go ahead and get our drain bolt
back in there. Make sure that gasket
washer hasn't been lost.
Do a little bit of cleanup work here.
We're gonna lower this back down and
then we'll get the filter changed out
and then get it refilled. Now let's go
ahead and pull our filter off. Before we
release it, let's go ahead and put a rag down
here just in case it decides it wants to
dribble a little bit down into the
cowling. This one hasn't been running in
a while, I don't think that's gonna be an
issue.
And it wasn't, but if yours has run
recently then something you want to
think about. Now I just want to put a
little bit of oil around this rubber
seal to make sure it doesn't tear when
we go to tighten it down. There is no
torque spec, so basically just spin it
down 'till she stops and then we're gonna
do in between three quarters and a turn
more and then that's done. There's a half,
and there's a whole. That's it. Now to
refill, we're gonna need three quarts. And
at that point, what you would want to do
is go ahead and start it up, let it idle
for a few minutes and then check it
again. And then add more if necessary.
Get our fill plug back in, get our
dipstick back in. Now at this point this
is where you're going to need to run it
for a couple of minutes, let it settle,
and then check it again. But we're not
going to be able to do that because this
one's not in running condition... yet. 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.
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you in the next video. Y'all have a great
day.
