Mystery Piston ?

[Joe Reeves]

This is one of those "Oh, I'll just set it aside and clean it up later. I won't forget what it came out of projects. I do recall it came out of a V6 Evinrude. The measurements below are an approximate as I'm not a machinist. It's obviously a small bore 3.5" piston so I would assume it's a 150hp model. The top half of the sleeve from the center of the wrist pin to the top edge of the piston has the well known very small ridges (for lack of a better word) circling it. Anyone know what year/model this piston is from?

Under the piston, it case the cast number 322969 and directly under the 322 is the trademark OMC.

 

[Joe Reeves]

Re: Mystery Piston ?

Just taking a 2nd chance at this in case someone might have missed it.

 

[HighTrim]

Re: Mystery Piston ?

I google searched the number and came up with this post, dont know if that helps. His came from a 1979 140hp Evinrude.

http://forums.iboats.com/showthread.php?t=168094

 

[Haffiman]

Re: Mystery Piston ?

Looking at a reference from Wiseco: http://www.wiseco.com/Catalogs/Marine/JohnsonEvinrude.pdf
that seems to use a part number 3173PS for the most of cross engines from 85 Hp and up , you may probably do the same providing the weight is the same as the one you are replacing. Used to have a lot of old pistons standing on a shelf and mainly used weight as reference for replacement providing Dia was the same.

 

[Joe Reeves]

Re: Mystery Piston ?

High Trim, Haffiman..... Thanks for those hyperlinks, led me right into the solution. I do appreciate your efforts, thank you.