*davies144*
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| posted on 11/3/09 at 09:47 PM |
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vectra sri
hi my m8's vectra is a S reg and was running badly the oil and water was mixing badly and it was using them both so we thought it would be the
head gaset, we took the head off but the head seems ok and the head gasket was ok, but the inlet manifold was really oily and it sounded like it was
running on 3 cylinders . ANY IDEAS?
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Ben_Copeland
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| posted on 11/3/09 at 09:51 PM |
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Vauxhalls had a nasty problem with the head going porous... sounds like that to me
Ben
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*davies144*
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| posted on 11/3/09 at 09:55 PM |
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but ther was no water in no.4 cylinder, so if it is porus would it make it missfire?
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Ben_Copeland
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| posted on 11/3/09 at 10:02 PM |
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but there is a lot of oil... so either its coming from the head, seals/porous, etc or the rings have gone and its burning oil.
Still think it coud be a porous head if the water and oil is mixing and the head gasket is ok. Oil could be getting into the cylinder through a crack
in the head??? did you check the inlet / outlet ports for anything nasty
Ben
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mediabloke
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| posted on 11/3/09 at 10:05 PM |
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Edit: Darn! Beat me to it! 
If the gasket had no obvious marks where the oil / water had tracked, there aren't many other ways that would start the mayo machine.
You say the head seemed okay. Did you get it pressure tested?
There was an issue with the Vauxhall (non-coscast) heads going porous. This might explain it better:
Linky
The link suggests a sealant treatment, but I seem to recall someone elsewhere suggesting an alternative to join the 2 oil galleries - or maybe I
dreamt it! I'll have a scout round.
Is this any use, too:
Camshaft cover breathers linky
Francis.
[Edited on 11/3/09 by mediabloke]
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*davies144*
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| posted on 11/3/09 at 10:27 PM |
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veccy
so reading the cashaft cover link would all the inlet manifold be shitty or would it jut be a ertain port, would a porus head cause the engine to
missfire?
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mediabloke
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| posted on 11/3/09 at 10:51 PM |
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quote:
Originally posted by *davies144*
so reading the cashaft cover link would all the inlet manifold be shitty or would it jut be a ertain port, would a porus head cause the engine to
missfire?
I'd have thought it'd be all ports, but the ones nearest the breather would bear the brunt. The effect would sound like a regular
misfire.
If the head was porous and had mixed as much oil & water as you said, it's more likely to blow mayo out of the breather too, but you'd
have noticed it in the manifold...
The only way I can think a porous head would cause a misfire was if there was a track between the water jacket / oil gallery and the cylinder (the
gases would escape to either the water expansion bottle or rocker cover) or if the cylinder had overheated & was seizing (now that wouldn't
make a nice sound).
If you have a mate with a compression tester nearby, a compression test would tell you if you had a leak from the cylinder bore or if the rings were
shot. My friendly mechanic also did a leakdown test on mine to confirm if there was any leakage from the water expansion, rocker cover or sump,
before I took the head off.
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UncleFista
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| posted on 11/3/09 at 11:03 PM |
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Vauxhall Astras of about that age have an oil to water cooler that's well known for corroding through and allowing oil and coolant to mix. Dunno
whether Vectras had the same, but maybe that's where the oil and water are mixing ?
Dunno about the rough running though, did both problems start at the same time ?
[Edited on 11/3/09 by UncleFista]
Tony Bond / UncleFista
Love is like a snowmobile, speeding across the frozen tundra.
Which suddenly flips, pinning you underneath.
At night the ice-weasels come...
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x_flow57
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| posted on 11/3/09 at 11:19 PM |
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If you have a V6 SRi they have an oil cooler in the water system between the "V" these leak and you get all the signs of a head gasket
gone, particularly oil in the cooling system. Don't ask how I know. Vauxhalls price for a replacement cooler was as good as I could find any
where.
Nick.
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blakep82
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| posted on 11/3/09 at 11:38 PM |
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if its an S reg, it shouldn't have problems with a porous head? that was only really a problem with th C20XE engine, which they stopped doing
before 98 didn't they? it would be an ecotec, but don't know what would cause your problems
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DorsetStrider
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| posted on 12/3/09 at 12:27 AM |
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I'm currently stripping a vectra sri with the ecotec engine. Will take a look tomorrow (if I get the chance) and see what I can see.
The one I'm stripping has leaked oil externally as well so could be the same thing maybe?
Who the f**K tightened this up!
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stevebubs
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| posted on 12/3/09 at 01:03 PM |
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If it were a V6 I would say look at the oil cooler nestled in the middle of the V....
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