How to bleed Mercruiser Power Trim
Andy's DIY: Mercruiser Alpha 1 Trim/Ram drain/replace and refill fluid
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I'm working with the 1981 Mercruiser set
up my I noticed my power trim tilt pump
I started I was a little bit of leaking
out of one of my Rams when the lines go
to my Rams and started noticing the
chocolate milk of a talked about so I
didn't see any videos out there on how
to actually drain the set up and flush
it all out and of course replaced that
line where I was getting the water
intrusion so I'm just gonna show you
real quick how you need to take this
pump apart and which pop I have so
here's my setup here this is a 70 series
pump I'll get you a serial number later
on the video here but basically to take
it out you got I'm sitting with the
motors I got my motor out so you'll have
to do this kind of leaning to one side
of the motor so I've got a little bit
better access to it but you got four
screws on the side this is all mounted
to this dis trans I'm here
you got basically your red wire or your
positive hooks to that and your ground
hooks to this or your neutral and that's
it as far as going to the bow the rest
this is all contained you've got your
drain your a drain or fill screw here
that's not a drain screw it's a fill and
then you've got a bent screw right
behind it but that's the unit then you
got this plug in
you got a plug in this thing here this
will plug right into there so to fill
this fill this pump you could fill it
with it with the with the plate or the
actual this is the actual motor up here
and the pump is actually in this lid
down here while it's upside down you
could actually fill it all the way up I
guess and put this on but I want to make
sure I got the right fluid level high
thana so you could do it I guess either
way you want to do it you're gonna have
to basically run fluid through the lines
and bleed the air out anyway so you're
gonna have to fill it with it in place
anyway so my setup is going to be using
one of these things and I'm gonna come
over here it's count a little bit I'm
gonna loosen some things but you can
come out from the top just plug it into
that hole like that and then just start
pushing it in
and then you'll just do just repeat that
step I use you know bottle this size
here mr. quart bottle
I used almost all that maybe about to
the bottom of the label there so almost
a full quart
maybe let's say 850 ml of this to fill
that thing and then you'll have to bleed
it out so other people in line are
saying to use get about three of these
and then as you bleed your lines out and
fill up your Rams and keep running it up
and down eventually you get all your air
out and you get everything recirculated
through but my pump states on it either
use 10w30 or 1040 so that's what I'm
using with this so this is the pump that
I'm working on there's number two I've
got it upside down here I've already
covered it back up so I took all this
stuff off and I went clean off my
contacts and everything you can't see it
cause it's covered up now but
everybody's been asked by the different
kinds of fluids that go in it and this
sticker says 10w30 or 10 W 40 so back in
this late seventies or whatever that's
not what they use I guess an even
further back they used oil
so there's I'm just gonna go back in it
with what it came with so 10w30 tuned
every 40 once you get the pump out this
is the bottom of it
you'll take out all these screws along
here I'm gonna try to reuse my gasket
here both in gasket that goes in still
here one thing I could advise you I'm
being real careful about losing is this
guy here this is the connection point
and it goes on there like that then it
connects to flip it over connects to
this part on the actual pump when I open
this up and had it upside down this
thing was completely full obviously it
was full I was a leaking down that bad
but it was full of the chocolate milk
looking stuff the tan and I didn't see
it in there so when I dumped it all out
this went into the garbage with it and
as I got it all cleaned up and uh and I
went out of inside here I hope it wasn't
a bad idea but I went out it with some
carb cleaner got it upside down and just
got everything out cleaned
completely out I went when I got my pump
out together I realized it wasn't
working right they didn't have this
thing in here that's when I that's why
it's all oily in there now anyway just
people care if you don't lose this
that's the connection point again it
goes here
Matt connects to when you when you get
this position upside down it'll connect
onto here that's what gives you the
joining it's got like a coupler I guess
anyway once you get it cleaned out you
put your gasket into here I'm gonna go
ahead and go on with some of this this
silicone just a little just so I can
stick it back down to make sure it's
gonna get a good contact point I'm
something but just a little fingering
down there and just tighten it back down
just to get a good tight seal on it um
let's see I guess that's basically it so
that's how you'll have to you'll have to
basically break it apart there's no
drain on this I was hoping it would be
but there's not plus I really really
want to get here and clean all that out
anyway so there's no drain the filling
point is okay so I've got some help here
with somebody activating the the buttons
up front in order to raise and lower you
want to bleed these lines all the way
out here so I believe these are the up
lines so go ahead and do the hang on do
the up lines she's kind of pumping it
out that's looking pretty clear if I
stop stop Telly's pretty good I've
already done this is the second round
I've done you can see what I've gotten
out it's kind of milky it must you look
in there so the up lines are good now
I'm gonna go ahead and do these long
tubes are going to be the down line so
I'll go ahead and do the down lines all
over down yeah keep going yeah just keep
going tight a to stop
milk of
[Applause]
keep on going keep going stop like it
was like I ran a little dries off to run
that through again anyway but you just
keep doing that repeating it
you can repeat that process you get all
the white out should be nice and clear
like those upper ones worth until you
get it clear that's why it takes three
or four cores to get it all the way plus
down okay so basically I've got these
all bled out all these down so next
thing you want to do is even if you're
replacing your Rams you have to do this
I want to end up mine and you can pull
on it just this this is your line this
one goes in here's your other line here
and they look like they're the same so
they're changeable but your RAM should
want to suck itself back in that's the
way I'll determine this that's the Rams
good not leaking what you also when
you're doing this be real careful it
will be mindful I run that got allowed
this muddy stuff out make sure if you do
whichever one you're doing first I left
one line on their backs I had them both
off put your finger up just make sure
when you pull it back have these things
covered up because he'll still spray all
of you as I found the other day that God
got me in the face but I just letting it
come back in its come on a force
everything out of here by doing this
back and forth there's like a towel over
it you're gonna wring out almost all the
fluid that's in it and then basically
you'll hook up one end and you'll start
you run the fluid in and then your the
other end and then eventually you get
all the lines on there and you run them
up and down until you've got the fluids
filled back up in there so that's how
you'll need to do your Rams and I'm sure
there's some videos out there that show
Ram fluid filling you like one final
note as you bleed the air out of your
system make sure you leave I like to
feel screw out of mind there's a feel
screw and I think this crew behind is a
vent screw but I let the fill screw out
of mind as I was bleeding there just to
make sure the air would burp all now the
system but when you after you feel like
you've gotten all the air out of your
system make sure your Rams are
completely compressed and then top it
off the last time if you fill it with
the Rams extend it or slightly extended
you don't have them all the way down
you're gonna overfill the system for the
ones that don't know like myself when
the reservoir is full the Rams are down
as you extend them all that fluidly
a reservoir or most of it and then it
pushes the Rams out so if you fill it
with the Rams are out you're gonna have
more than enough fluid coming back and
if you've got everything tightened down
and somehow mistakenly had your van
tightened down too tight you could blow
out one of your lines to your Rams and
you're starting all over again so just
make sure your Rams are completely
compressed and then top the system off
and then you should be good to go
good luck
