B7100 Piston Installation

[Schmotown]

I am rebuilding the engine in my B7100. I know that the connecting rod is directional when installing but I do not see any markings on the new (or old) Kubota pistons. Attached is a picture of the bottom of the new piston which does have a number cast in one side and the opposite side is blank. Are they directional? Thank you in advance.

 

[85Hokie]

SEE If this helps

 

[Schmotown]

SEE If this helps

Thanks, I did read that before I posted my question. I'm not sure what Mr. Wolfman is referring to as marks on the piston.

 

[North Idaho Wolfman]

Thanks, I did read that before I posted my question. I'm not sure what Mr. Wolfman is referring to as marks on the piston.

Stock, old pistons will have a name / numbers cast into the inside those numbers go towards the injection pump side, same as the rods.

Aftermarket pistons very typically will have a stamp on face of the piston, I've seen dimples, letters, arrows they will either go forward facing or injection pump facing.
It could even be on a skirt, but that's rare.

If the new piston is in first pic, this mark goes towards the injection pump.

 

[Schmotown]

Stock, old pistons will have a name / numbers cast into the inside those numbers go towards the injection pump side, same as the rods.

Aftermarket pistons very typically will have a stamp on face of the piston, I've seen dimples, letters, arrows they will either go forward facing or injection pump facing.
It could even be on a skirt, but that's rare.

If the new piston is in first pic, this mark goes towards the injection pump.

View attachment 154292

North Idaho Wolfman, thanks for clarifying. The picture shows the mark on a new Kubota piston.