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What's with these pistons (pics)?

N

notjustair

Well-known Member
I remember a couple of days ago there was a discussion about pistons. Seems like someone talked about these. I tore apart the M and lo and behold I had these pistons in there. When I ordered the rebuild kit I ordered stepped pistons. When I described these the guy (on here) that I ordered from wasn't sure exactly what I was talking about.

They are stamped with the IH logo on the skirt. They are "hilled" on the spark plug side only but have a dip in them where the plug matches up. It appears that the bottom end has never been apart but I don't know about the top end. The guides were so worn I'll bet the head hadn't been done. All of the numbers point to a 1950.

Were these gas only pistons? High altitude pistons? I think it was always a midwest tractor.

6648.jpg
6649.jpg
 
Fire craters. The ones you ordered probably give less compression, at least the ones that came with the kit for my Super M do. They are not in bad shape. My machinest says he can clean the fire craters up, and I will use new rings and sleeves.
 
Those are not the original pistons, as fire craters did not come out until M and I think SM production was over.
 
They are fire crater all right, and they almost look
like high alt ones. It has been quite a while since
I had one of those apart but I have put in the high
alt ones when the M had the low compression head.
They came out after 58 some time, not factory
installed. The 706 was first engine that came with a
fire crater from factory as the 560's etc had the
straight dome style pistons.
 
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