oil coming out of spark plug holes!
Turbo Mini Forums

i need your help :)

oil is coming from spark plug holes, why?

i strip my engine, took my head off and there was oil in it :(

i was thinking that my rings are dead, but they looks good, crankshaft bearing are ok as well.

so i do not understand how that oil is getting there?

Nothing special!

sounds crazy (or not) but could that oil come from turbo unit?
because i notice there oil :/

Nothing special!

Any chance it is dripping when hot from the rocker cover gasket, while driving.
It would settle in the area of the spark plug! That fooled me once before.

sorry reread post, ignore me :$

Did oil enter bores from taking head off?

It could quite easily be from the turbo. Is there oil in the carb and pipework?

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1/4mile in 13.2sec @ 111 terminal on 15psi

Nothing special!

Nothing special!

Check for play in the turbo shaft. Its strange that there is no oil in the carb/inlet if the turbo knackered.

Only other places it can come from is valve stem seals or rings.

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1/4mile in 13.2sec @ 111 terminal on 15psi

On 1st Jun, 2010 matty said:
Check for play in the turbo shaft. Its strange that there is no oil in the carb/inlet if the turbo knackered.

Only other places it can come from is valve stem seals or rings.

Nothing special!

more to the point.


why are you stripping the engine in the first place ? And how much oil ? pictures might help.

Has the engine actually ever run ?

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

it was running but very badly, not enough power like it was before,
did not wanted to go faster than 55mph :(

then i notice that oil start coming from spark plug holes, more from 2nd.
also i found some oil in my clutch.

so i decide to strip all engine and i was thinking that my piston rings are gone, but found that they are ok and then i
was confused, where that oil came from :/

oh.. no pic available, there was almost same amount of oil like on turbo pic, only it was all head like that

hope it helps :)

Nothing special!

that turbo looks some years old and worse for wear!

inspect the guide seals then and if you are sure!!! the pistons are ok ?
the problem will lie in the the turbo especiall if its as old as me and you have no history of it

whats the spec of the engine and history ? milage etc .........

The picture of the turbo is just the inlet side of the compressor - if the compressor shaft seal leaks, the majority of the oil will be seen on the other side of the compressor, in the pipe up to the carb (or to the intercooler if you run one).

Schrödinger's cat - so which one am I ???

Nothing special!

4 is correct, inlets only.

Edited by theoneeyedlizard on 2nd Jun, 2010.

In the 13's at last!.. Just

Nothing special!

these ones will be ok?


are they goes only on exhaust valves as it says: A "must" for the exhaust valves"

may be it is better if i put these on all 8?? or better to change only that 4?:)

and stick with these ones :

do you have any other suggestions? 8-)

Nothing special!

if the guides are not too! worn replace all 8 seals with the viton SPI ones a little more costly but worth it

I'd never fit seals on the exhaust on a turbo engine...

Opinions do vary as you can see, but my opinion is 4 on the inlets only.

My logic;

The inlet ports are under vacuum most of the time (even a turbocharged engine doesn't spend much of its time actually on boost) so the seals stop the oil being sucked in from the rocker area.

The exhaust ports are slightly pressurised (more so on a turbo) so the only way oil goes down them is by the "pumping" action of the valve moving up and down or just runs down if the guides or valve stems are badly worn.
And a little bit of oil going down the exhaust guides helps transfer the heat from a very hot exhaust valve stem to the guide, head and coolant.
Having to fit stem seals to exhaust valves is a sign of excessive wear on the stems or guides in my opinion.

Finally, if yours is a genuine Metro Turbo head and you feel the need to use seals on the exhaust stems, the ones listed probably won't fit properly - original Metro Turbo exhaust valve stems are a larger diameter.

Schrödinger's cat - so which one am I ???

Nothing special!

Inlets are all the same diameter, it's only the original Metro turbo exhaust valve stems that were larger (because they are sodium filled).

Meausure what you have and you will soon see if it's the original exhaust valves.

Schrödinger's cat - so which one am I ???

I wouldn't fit stem seals to the exhaust, the valve needs the extra cooling & lubrication as it runs a lot hotter than the inlet.

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thank you

Nothing special!

May I suggest making sure your spark plugs are fitted correctly. I had exactly the same situation in my early years, egg on face and a lot of humble pie eating occured.

Own the day