I got them measured. Not results I wanted. This V6 will cost me some serious money!
All fucked up, because people rebuilding engines without knowledge.
All cylinders honed to C class. Cylinder 2 had some serious problems, because it is very worn.
Pistons. I don't know why, maybe already because to much big clearance or because they have left old piston rings. Pistons are ever bellow A class. You can't see any worn marks on them, but they are fucked up. Measured 2 times, to be sure.
Clearance between cylinder and piston should be 0.050 in 0.069 mm according to manuals specs. And mine have clearance bewteen 0.112 to 0.244 mm
Piston specs. Mine bellow any class.
Cylinder specs. Mine are let's say so, C class.
And clearance between both as it should be.
Would you say by look, that this is fucked piston? I wouldn't...
So now I am looking for other used set of pistons and cylinder, that will be within manual specs. I already found 7-8 sets (new and used). So something will probably be ok. Last option is new set pistons and cylinder, which is about 700-1000€