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LFY MP7.3
LFY MP7.3
22:14
user image
Is this the groove you were talking about in your tips?
@Pᴀᴜʟsᴛᴇʀ2
Pᴀᴜʟsᴛᴇʀ2
Pᴀᴜʟsᴛᴇʀ2
22:28
@LFYMP7.3 - Yes.
I really don't know what you call it, so called it a "groove", lol
Also, if you look in the image, down at the bottom of the groove is a small hole. This is a drain hole for oil. If you push the seal too far into the groove, you'll block this hole, which will cause you issues with oiling and drainage.
LFY MP7.3
LFY MP7.3
How should I make sure these things won't happen?
I can make some measurements for the correct position of the seal
The only thing I'm afraid about is how deep should the seal be. How far should it go in
This is probably the problem most people have faced with
I'm considering buying a rusty cylinder head from a scrapyard and practice on it first before doing anything in the real world.
Pᴀᴜʟsᴛᴇʀ2
Pᴀᴜʟsᴛᴇʀ2
@LFYMP7.3 - Flush with the outer edge or just beyond that. When you put the seal in with the camshaft, you'll see how much space is between the bottom of the seal groove and the seal.
@LFYMP7.3 - Just realize if you actually do this, you can't reuse any seal you've done this with.
LFY MP7.3
LFY MP7.3
Yes, I can use them once. I know it.
Pᴀᴜʟsᴛᴇʀ2
Pᴀᴜʟsᴛᴇʀ2
@LFYMP7.3 - You're making a mountain out of a molehill. Here's what you need to remember ... ensure it is square in the groove (ie: perpendicular to the camshaft) and make sure it isn't bottomed out.
The cam won't go all the way down because the buckets will be pushing up on some of the cam lobes. You'll be able to adjust the seal before you place the caps and tighten them down.
LFY MP7.3
LFY MP7.3
To be honest, you freaked me out when you talked about leakage!
Pᴀᴜʟsᴛᴇʀ2
Pᴀᴜʟsᴛᴇʀ2
22:42
Oh, it is a definitely possibility.
But if you're careful, it'll be just fine.
LFY MP7.3
LFY MP7.3
My car still has its original seals after 20 years with zero leakage but since I have to replace my lifters I have to replace the seals as well. I have no choice!
Pᴀᴜʟsᴛᴇʀ2
Pᴀᴜʟsᴛᴇʀ2
Yup, that's how it works.
Squareness in the groove is the most important. And be careful with them not to nick the rubber.
LFY MP7.3
LFY MP7.3
What do you exactly mean by Squareness?
Squareness in the groove
Pᴀᴜʟsᴛᴇʀ2
Pᴀᴜʟsᴛᴇʀ2
@LFYMP7.3 - Yes. That is why having it flush to the outside works well because it is exactly square there. Just beyond is fine, too. Just line it up square (or perpendicular to the cam) and you're golden. It isn't hard.
LFY MP7.3
LFY MP7.3
perpendicular to the cam
Is it possible to be non-perpendicular to the cam as well?
How could it be?
Do you mean for example the lower part of the seal (below camshaft) is further in than the upper part (above the camshaft)?
If this is what you mean by NON-perpendicular, then I got your point.
And by being perpendicular to the cam, you mean both the lower and upper parts of the seal should form a straight line and go in equally.
Pᴀᴜʟsᴛᴇʀ2
Pᴀᴜʟsᴛᴇʀ2
23:03
Quit over thinking it.
LFY MP7.3
LFY MP7.3
I just wanted to make sure, I have understood your tips well. That's all.
I have done many services on cars based on your tips and nothing has ever gone wrong.
Pᴀᴜʟsᴛᴇʀ2
Pᴀᴜʟsᴛᴇʀ2
@LFYMP7.3 - It's all good. Really, there's no real gotchas ... just be careful not to damage the seal(s) during installation. You'd have to force it to not be perpendicular.
LFY MP7.3
LFY MP7.3
That's why I always ask you first when in doubt about something.
Pᴀᴜʟsᴛᴇʀ2
Pᴀᴜʟsᴛᴇʀ2
When you put the seal on the cam itself, it should be pretty much perpendicular because the seal will force it to be so.
Before you start tightening down the cam caps, just make sure the seal isn't screwy in the groove and it will be just fine.
LFY MP7.3
LFY MP7.3
Some say when you start to tighten the caps, the seals may want to go out.
Pᴀᴜʟsᴛᴇʀ2
Pᴀᴜʟsᴛᴇʀ2
23:10
@LFYMP7.3 - Yah, just watch them as you do. If they start to push out, then straighten them before you tighten the cap all the way.
LFY MP7.3
LFY MP7.3
@Pᴀᴜʟsᴛᴇʀ2 I used to think it is as easy as putting them flush with the head and tighten the caps!
Pᴀᴜʟsᴛᴇʀ2
Pᴀᴜʟsᴛᴇʀ2
That's pretty much all there is to it. You just don't want them protruding at all.
LFY MP7.3
LFY MP7.3
There is something strange about my cam caps.
Look here:
user image
This is the tightening sequence recommended by manufacturer for my car
Isn't it strange?
I have never seen such a sequence
It is usually something like the following in most cars:
user image
It is so strange that I thought it could be a typo!
It is so easy! Just tightening the bolts from left to right then from right to left!
It says:
1) tighten all bolts fingertight
2) tighten them to 5 Nm
3) tighten them to 10 Nm
That's all
I asked this here because it could be ranked as an opinion-based question.

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