problems with boring a cylinder

[leroy]

Hi, let me introduce myself, I'm John and I'm building an PB15 Loco in 5'' gauge located Gold Coast Australia, I'm an amateur  self taught machinest, on my first loco,
I'm just starting to work on boring the cylinders and discover that the centre line of the bore is about 6mm off centre from where it should be, the finished diameter
of the bore is 1 7/8, so I decided to set the cylinder up in the 4 jaw chuck and attempt to re bore the cylinder offset to bring the center line to the correct position,
I hope I'm making sense so far, in order to bring the oval bore out to a concentric circle I found the bore is now 1mm over size,
so I'm asking for any suggestions on what my options are, one, ask the supplier to replace cylinders, two, bore the cylinder out to the next standard size which is 2 inch and what are the  consequences of doing that? any other options?
any help is much appreciated.
Regards John. 

[Cro]

Hi John,

Welcome to the forum, what I would suggest is to take your post and re-post it in the "Main" general chat area as this is mostly for questions regarding to Modelworks locos and rarely gets spotted by most people.

Once post there I am sure many people will be able to contribute to help you.

I personally would be inclined to see if the supplier would send you another set as that's quite badly out but it depends if you are willing to machine another set up. If you are making everything from scratch, piston, rings (or packing) then I'd say live with the 1mm oversize. If you are buying piston rings at set dimensions then that makes life a bit more tricky.

Like I say, post in the main area and no doubt a solution will present itself.

Adam

[leroy]

thanks Adam