Mystery

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.

July 7th, 2002, 04:09 PM

#1​

MIKE_OMC
[OP]
CadetJoin DateJul 2002Posts6

That is a casting number and not a part number. Just measure the cylinder dia, and you will know if re-bored or not.

Looks more like a scrap piston as skirt looks worn in picture.

Looks like a good used piston , could come from any V-4 or V-6 ( small bore ) cross flow motor from 74 to 96 or so.----They all used the same size / dimension pistons.

Mystery solved and part number obtained, thanks fellows. Now, a couple dozen pistons to bead blast and inspect.