Reply To: Smokey F.15 – well, thats odd

[wristpin]

Have you actually removed the rings and measured the gap in the bore

If you have a look at “spec page” of the F15 manual scan that I posted there is quite a lot of info on ring sizes and end gaps – 6 – 11 thou, I think.
Take each ring off the piston – keeping them in order and correct orientation and poke each one in turn into the running section of the bore using the piston upside down to keep them square and then check the end gaps . Then push them down to the unworn area at the bottom of the bore ( remember that the oil control ring is at the very bottom of the piston) and check / compare again. That will give you an idea of what and where the wear is but, of course it is more meaningful if you have some new rings as a “control” .