The liners are cut out with a boring bar, then new ones pressed in, then rebored to fit. These are just dry liners like machine shops use in most any engine block to repair bore damage.

I've seen where people have had good luck reusing pistons. I'm personally a little leary of this. I have had a piston ring land failure before. Pistons are very highly stressed in a diesel engine.

If the pistons pass close inspection, I guess it would be acceptable though. Inspect them CLOSELY.

Good luck,