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Practical Engine Building: Installing and Removing Valve Guide Seals

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Installing and Removing Valve Guide Seals

05.45

00:00 - One of the important tasks that you'll need to perform when you're stripping and rebuilding a cylinder head, is removing and installing the valve guide seals.
00:08 These valve guide seals are a critical component to prevent excess oil consumption.
00:13 In this module we're going to have a look at the process and we'll have a look at a couple of different techniques for installing the valve guide seals.
00:21 First of all I've got one of my valve guide seals here and this is a Supertech component that's going to be going into the 2JZ cylinder head.
00:30 So we'll start by installing this onto the valve guide.
00:34 It's important to note that quite often the valve guide seals will differ from the inlet to the exhaust, so you want to make sure that you're installing the correct valve guide seal.
00:44 The other aspect to take note of is that in some cylinder head designs the spring seat needs to be installed prior to the valve guide seal being fitted.
00:54 Now if we don't notice this and we go and install our valve guide seals they'll all be ruined because they'll need to be removed in order to get the spring seats fitted.
01:04 Now what we're going to do is start by applying a thin coat of lubricating oil to the underside of our valve guide seal.
01:12 Now we want to do this just to prevent any chance of the valve guide seal from picking up on the guide as it's installed.
01:20 For our first demonstration I'm going to be using a valve guide seal installation tool.
01:26 Now these are available relatively cheaply.
01:28 They have a stem which locates the guide seal and also then locates into the valve guide itself.
01:35 Now this is convenient because it prevents any chance of installing the valve guide seal on an angle.
01:43 So we're going to be making sure, using one of these tools that we are installing the valve guide seal square onto the guide.
01:50 So what we'll do now is we'll locate the installation tool in our valve guide.
01:55 We can see that slides down quite nicely.
01:58 We're just going to use a hammer and a couple of light taps will push that guide seal into place.
02:06 It doesn't require excessive force, and what we note is that as we tap that guide seal into place we can physically hear or audibly hear the note change when the guide seal is in place and it won't move down any further.
02:21 Following this we can remove the installation tool, move on and install our next valve guide seal.
02:27 Now what we're going to do is have a look at a different technique if you don't have a valve guide seal installation tool.
02:34 We can still install the valve guide seals relatively easily.
02:38 What I'm going to use for this task is just a common quarter inch drive socket.
02:43 Now this does require a little bit more care because we obviously aren't locating in the valve guide, so it is a little bit trickier to make sure that we install the valve guide seals squarely.
02:55 Now when we are choosing the right sized socket, what we want to do is take note of how the socket locates on the valve guide seal.
03:04 What we want to do is actually push down on the shoulder of the valve guide seal rather than the rubber inside edge.
03:11 So this particular socket that I'm using here, which is a 3/8th inch socket, actually works really nicely because the inside seal where it actually locates on the valve, makes it a snug fit inside the socket so it won't drop out.
03:29 Following this I'm just going to insert an extension into the socket.
03:33 Again I'll lubricate the valve guide seal with some clean engine oil, and we're going to slide the seal down onto the top of the guide.
03:43 When I'm doing this, because we're not located in the guide, it's really important to make sure before we tap the seal into place that we do have our extension located square to the guide.
03:54 Once we've done this, again we can just tap on the end of the extension, doesn't require a lot of force, and this'll push the guide seal into place.
04:04 Again we hear the note change when the guide seal is in place.
04:09 So we've seen two techniques now for installing our valve guide seals.
04:12 We're also going to have a look at how we can remove the valve guide seals.
04:17 Now I have a special tool for doing so.
04:20 This is a valve guide seal removing tool.
04:22 There are a few different varieties of these.
04:25 And all we need to do is slip this down over the valve guide seal, apply a gentle amount of pressure so that it's not going to slip off, and then we can just pull the valve guide seal off the guide.
04:36 It is important to mention that the valve guide seals aren't reusable and once we've removed them, this will inevitably damage the inside of the valve guide seal where it locates on the valve guide, so we can't refit a used set of valve guide seals.
04:52 While for this example we have used a specific tool to remove the valve guide seals, often we can achieve the same result using basic pliers that just about any enthusiast mechanic should already have in their toolbox.
05:07 Do need to mention here that whether we can use pliers is going to come down to the design of the cylinder head.
05:14 In particular the 2JZ that we used for our example makes access to the valve guide seal very difficult by virtue of the bore that the bucket runs in.
05:25 This makes it difficult to get a set of pliers down around the valve guide seal without potentially damaging the surface of that bore.