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[Doctor Gollum]

You might get away with dropping the sump seeing as it's in a Vectra, but the piston has to come out of the top.

Could you do it? Probably.

Should you? No.

And what if you don't find anything? Do you strip the rest of the block? At that point why only do one. And do you then replace the crank bearings? Upgrade everything?

And if you're going to totally rebuild the engine you would be insane to try to do it in the car... On the kitchen table or living room floor would be questionable at best.

[xt600]

You might get away with dropping the sump seeing as it's in a Vectra, but the piston has to come out of the top.

Could you do it? Probably.

Should you? No.

And what if you don't find anything? Do you strip the rest of the block? At that point why only do one. And do you then replace the crank bearings? Upgrade everything?

And if you're going to totally rebuild the engine you would be insane to try to do it in the car... On the kitchen table or living room floor would be questionable at best.

Ah, but if I don't do it I'll never know if it was caused by a chunk of ring or something else! Shouldn't take longer than 30 mins, and my garage is strewn with engine parts now anyway :-) By the way, I put new big end shells in when I did the top end, curiosity got the better of me and I wanted to see how clean,or dirty, it all was inside. I didn't touch the mains, as obviously that entails a much bigger step.

[xt600]

Update: So, after I took the damaged piston to an engine specialist I was told it was fine, clean it up and stick it back in! I did this, honed all the cylinders and a new set of rings in each. Compression readings all looked good. The engine has been running fine since, and I was hoping that the continued oil burning was just the new rings bedding in. However, 8000 miles later and it's still smoking and burning oil!!!

[Doctor Gollum]

Did you replace the valve stem seals whilst the engine was on bits