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[JamesV6CDX]

Just doing final clean before refitting head hopefully tomorrow. Span the engine by hand to wipe the bores clean.

Found this.

Gutted doesn't come close to covering it.

[JasonH]

Nightmare.

Afraid I can't offer advice on how terminal that really is. Perhaps it'll just lose a tiny bit of oil and compression will be a bit down on that cylinder??

[JamesV6CDX]

I'm more interested in how it's happened? I don't recall seeing it before but then I didn't inspect the bores, and this one was close to the top before I gently spun the engine by using a hand on the pulley

Is it something that I could have done having turned one rotation by hand? Or must it have been like it before!

You can't feel it with a fingernail or finger. The car never used any oil before 

[flyer 0712]

Would a glaze buster help to tone the marks down   

[JamesV6CDX]

Has something caught in the ring? Poss ring damage? 

[flyer 0712]

Could be...has it ever over heated in a bad way

[JamesV6CDX]

Could be...has it ever over heated in a bad way

Never in my last 20k of ownership

[106pete]

Looks like something has been trapped between piston on top ring whilst running, unless it's majorly scored (depth), I'd just use some 2k grit wet and dry to smooth it off.

But I'd say take the piston out to inspect and clean before doin any of that, if the foreign body is still there it'll get way worse.

Hope you've caught it before to much damage is done.

[JamesV6CDX]

Taking the piston out isn't really an option 

[Andy H]

I'm more interested in how it's happened? I don't recall seeing it before but then I didn't inspect the bores, and this one was close to the top before I gently spun the engine by using a hand on the pulley

Is it something that I could have done having turned one rotation by hand? Or must it have been like it before!

You can't feel it with a fingernail or finger. The car never used any oil before 

Probably nothing then. Maybe a bit of carbon fell into the gap between piston and bore when the head came off and wiped the oil off when you span the engine by hand?

It is more or less in line with the gudgeon pin so isn't on a face subject to sideways forces (and hence wear). If I squint I think I can still see the factory honing on the bore surface.

Unless you drop the sump so you can't undo the big end bolts to lift the piston out for a look-see so get the head back on and forget about it........

[Andy H]

I'm more interested in how it's happened? I don't recall seeing it before but then I didn't inspect the bores, and this one was close to the top before I gently spun the engine by using a hand on the pulley

Is it something that I could have done having turned one rotation by hand? Or must it have been like it before!

You can't feel it with a fingernail or finger. The car never used any oil before 

No - That happened with the engine running.

Maybe it was an artifact released by the death of the turbo?

I still think it was something soft (not a piston ring) and not something to lose too much sleep over

[JamesV6CDX]

I'm more interested in how it's happened? I don't recall seeing it before but then I didn't inspect the bores, and this one was close to the top before I gently spun the engine by using a hand on the pulley

Is it something that I could have done having turned one rotation by hand? Or must it have been like it before!

You can't feel it with a fingernail or finger. The car never used any oil before 

No - That happened with the engine running.

Maybe it was an artifact released by the death of the turbo?

I still think it was something soft (not a piston ring) and not something to lose too much sleep over

Sure? That makes me feel a little better as it ran sweet before

[X30XE]

Missing circlip on the end of the pin? 

[JamesV6CDX]

Missing circlip on the end of the pin? 

Eg the pin holding the piston to the rod? How would that have happened? 

If we're certain this scoring happened when the car was running, before it was dismantled, that makes me feel a bit better. I was worrying it's something I did during the repair process 

[106pete]

Taking the piston out isn't really an option 

I don't know how big of a deal it is to remove on your car but usually just drop the sump and undo the 2 big end Conrod bolts and out it comes?