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M20 Head Valve Seals Damage???
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Thats a vale stem guide, rather than a seat. and my understanding is that the valve stem seal with the spring that does the actual sealing fits around that, or close to it.
Perhaps you might have gotten away with it if the valve stem seal (rubber doovy) still makes a nice seal on your damaged valve stem guide.
However if that copper/brass piece is available and is replaceably, id be buying a new one, cause otherwise if it leaks your engine will suck in oil and burn it:)
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That is a valve guide, and noted above. They are replaceable, but must be done by a machine shop because they are press fit. A stem seal repair kit isn't want you need to repair it. I'm sure bimmerheads can help you out. Otherwise search m20 valve guide (you'll probably need oversized ones).
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got it...thought the yellow bits here
https://www.ecstuning.com/b-genuine-...t/11349059172/
in this kit were the valve guides...obviously not...thanks
any suggestions on the seal brands?
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I'm no expert in rebuilding heads, but why not just take the head to a trusted machine shop and get their opinion?
Personally, I would take the matching valve for that cylinder, oil the stem up and slowly insert it. If any burr is present in the guide you'll feel the interference immediately and stop pushing the valve in and replace the guide. If the burr makes a microscrstch, at least it'll be in the area of the retainers. Who knows, maybe the machine shop can polish the inner surface of the guide to remove the burr.
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Do the valves still fit?
I've found that the guides on anything with 100k miles are getting pretty worn-
likewise, the valves and seats themselves.
But that damage is cosmetic- if the stem goes in and the stem seal will go on, it'll function ok.
Me, if it was anything beyond daily beater, I'd take it to a machine shop for a freshening...
tnow, sometimes I just mess with people. It's more entertaining that way. george graves
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looks salvageable atleast from the pics without pulling it89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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is is EX or IN side? If EX and original, I would replace them since there are out of spec most likely anyway. Honestly, I would replace them due to that damage anyway, who knows how mangled they are on the inside, can't see from that pic.
How did you manage to do that? Were you grabbing the seal with one side of pliers from the inside or something?
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Back from the machine shop....machinist doesn't see it to an issue as long as the valve seats in there nicely and laps well, shouldn't be an issue.
The damage is only on the inside, just at the top. This was the first seal I removed on my first head tear down...used need nose pliers and obviously went too far down/did it incorrectly. removed the seals differently on the remaining ones and they are fine.
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