Hello, John Talley here with partzilla.com.
Today we're doing a little work on our 2003 Honda Rancher 350.
What are we going to be working on?
Well, we're going to take the head apart, take a look at those valves, get it cleaned
back up, and then reinstall it on the machine.
So if you're ready, I'll go grab a couple of tools and I'll show you how to get it done.
Alright guys, before we get started, this is actually going to be a skill level 2.
So it's not going to be really that involved although you really need to pay attention
to what you're doing, so watch this video carefully.
Now as far as the tools you're going to need, it's a pretty short list.
The most important one that you're going to need to get ahold of is a valve spring compressor.
Once you have that, all you're going to need is just a magnet, this little pick tool, a
little bit of length of rubber hose, some valve lapping compound, some Prussian blue,
and then just any type of grease.
It really is not that specific.
Now if you would, reference our exploded diagrams, that's going to give you a real clear picture
of how things are put back together.
And everything is listed out as far as the parts you're going to need to order.
So, once you have your tools and your parts together, I can show you how to get it done.
Alright guys here's what we're going to do: we're gonna go ahead and get this cleaned
up, and then we're going to lap in a new set of valves, as well as putting in a couple
of new seals.
Now before I pull these valves out, I want to go ahead and use a wire brush to clean
out this additional carbon that doesn't need to be in there.
To clean it up I'm leaving the valves in because I don't want to damage or scratch the actual
seats surface on the valve seat itself.
So, give me a couple of minutes to get this cleaned out, sprayed off, and then we'll get
those valves out of there.
Alright, let's start off by getting the intake out first.
I'm using just a little small magnet, that's usually the best way to get them out.
Go ahead and look at the surface of the stem itself.
This is actually in pretty good shape.
They're really not that expensive, so I'm going to go ahead and replace them.
Alright, next lets' go ahead and get that exhaust out.
Same thing on the exhaust.
That one's looking pretty good.
Alright next, let's go ahead and get our seals popped off.
Won't take much effort, do't push too hard because I don't want to damage the valve guide.
Alright we're going to compare it to the new ones.
The old one at the top is just a little bit stiff, almost crunch feeling.
The new one, nice and pliable.
Really kind of an elastic feel to it-- pushes back against you.
That's the best way I can think to explain it.
So...
Let's get both of them off, and while we've got the seals out I want to take a look at
the valves just one more time.
And I'm just doing this by feel.
I'm just running it in there, seeing if it will rock back and forth, which is what I
don't want.
This is more or less telling me if my valve guides are worn out.
It's got a little bit of play in it, but not much.
So I feel very confident by going with new valves that we're going to be good to go.
What I'm doing now is just cleaning up the seats.
Because we're going to put some Prussian Blue on the seats and then drop out valve in there
and check where the actual sealing surface is.
Make sure there's no gaps.
We're actually going to do that before we lap them in.
the lap, that's absolutely going to assure that there's a consistent surface area being
contacted in between the new valve and the existing seats.
Alright, let's get our new intake.
What we're going to do is just pop it in there, and then pull it back out.
Don't turn it, just pop it in and push it right back out.
Okay, here's what that is showing us: it's riding a little bit low right here, a little
here, and right there.
So we definitely need to lap this in because what that's going to do is take out those
highs and lows, and we're only talking about tens of thousandths of an inch here so it's
not a lot of area.
But this will show how important it is to lap your valves properly.
So, let me get this cleaned off as well, then we're going to lap both of them in and we're
going to go back and look at it again with the Prussian Blue and it should be a nice
solid line all the way around the valve base.
Don't get any of that on your valve stem, because we don't want to eat up the guide.
But we do want to put a little oil on the stem, because we're going to pop it in there
and we're going to use a little bit of tubing to go over then end with the valve.
And what we're going to do is pull out on it and spin it back and forth.
And what you're going to hear is it'll have a real gritty sound to it.
You want to keep doing that til that kinda goes away, push the valve back out and that
draws in more of the lapping compound, and then we do it again.
We'll do that about five or six times and that should be enough to lap it in there.
See how it kinda got quieter?
Push it out, rotate it, draw it back in.
And that should do it.
Let's go ahead and get our valve out and then carefully clean off all that compound.
All of that needs to be removed before we put it back together, because the last thing
you want to do is have a bunch of abrasive running around in your engine.
After doing that, then you'll notice on the valve, you'll see kind of a dull line.
That's where that lapping compound was and where it actually interacted with the actual
seat itself, so when we put on our Prussian Blue that same line should be pretty much
equal all the way around with that blue dye.
But, let's put that to the side, finish cleaning up our seat and then we'll do the exhaust
side.
A little bit of oil on the stem.
In she goes.
That should be it.
Let's get that one out, get it cleaned back up, and then put some Prussian Blue in there
and see what we ended up with.
Go ahead and do the intake first.
That's what I wanted to see.
There's a blue line all the way around that surface.
So that's what we were after.
Same thing there.
Alright, so let's get it cleaned back up then we can start putting it back together.
Getting seals on is pretty simple.
Make sure it's clean and dry and then you just push them on.
Be careful not to push too hard.
If you put your hand down too far on those springs down at the end, it's easy to push
those off.
When I was spraying out the head with he contact cleaner, make sure that wiped out any oil
that we had inside the guides, so get a little bit of oil on the end of a Q-tip, and just
run it back in there.
Take a little bit at the top, put it on the end of the seal.
Doesn't take much, just want to get a coating on the surface.
Now, let's go ahead and get our valves back in there.
We'll do the intake first.
So take a little bit more oil, put it on the stem, pop her back in.
When you're doing that you want to put your fingers on the end of the seal just to make
sure it doesn't try to push it off the seat.
Inner spring, outer.
Let's get her set back up in there.
Show you a little trick to putting the keepers back in.
Take a little bit of grease, put them around the inside.
That does two things.
You can then hold it on the end of a pick tool and then when you get it up there, it
has a tenancy to at least try to attach itself to the valve stem instead of bouncing all
over the place.
Alright, you're going to laugh but Honda says to do it this way.
Alright, they're in there, but to get then to seat in, and to make sure they're seated,
get a couple of hammers, a soft-blow, and just... pop it a couple of times.
That'll just guarantee that they're actually seated around the collar.
Alright, let's get the exhaust one in there.
A little bit of oil on the stem, hold the seal as you're pushing it through.
Now let's get our springs on there.
Same technique that we used on the intake.
Alright, looks like they are in there now.
Alright guys, that pretty mush wraps this one up.
What you want to do next is just reference our head installation video for this particular
unit and that one will tell you how to install it exactly.
Well listen, if you need any of the parts that we used to get it this far, come see
us at partzilla.com and we can get you taken care of.
If you have any questions or comments, leave them in the section below and I'll do my best
to answer them.
And until next time we just want to say thanks for watching.