OK CL450 pistons to keep?

[DHolbrook]

These are the look of my CL450 pistons as they came out of the motor. Machinist recommends a hone only, so I could keep the pistons if the look good. How do they seem? There is scoring, but it looks minor.

 

[Sonreir]

How they look is not nearly important as how they measure out. I don't have a 450 manual handy, but there will be "maintenance standards" section toward the back that indicates the acceptable service limit for the pistons.

 

[DHolbrook]

I see the measurements for roundness in my manual, but the manual doesn't mention wear marks, so I thought I'd ask.

 

[teazer]

Pistons are not round. They are oval shaped - longer front to back than side to side. they also taper - largest at the bottom, smallest just below the bottom ring. That scratching is OK. Check bore to piston clearance at the front or rear face. If it's less than the service limit, a quick glaze busting hone will be fine.