piston direction

Ed Womer · Apr 25, 2020

Hi Guys, I am finally getting around to re-assembling my TO 20 engine and have a question. The original pistons had an arrow and front stamped into the piston but the kit that I purchased from Yesterday's Tractor doesn't have that on the pistons. It does have some numbers and a notch machined into the edge of the top and I am wondering if that notch goes to the front? It is the pistons that come with the complete engine overhaul kit that I bought a few years ago. Thanks for your help, Ed

sunbeam · Apr 25, 2020

I think you pistons will have a pin offset. If they do the side that is closer to the side of the piston will go on the left as you are sitting on the tractor.

Steve@Advance · Apr 25, 2020

A notch in the top indicates the front.

Ed Womer · Apr 26, 2020

I did try to mic the old pistons to see if there might be an offset but my standard calipers wouldn't work and my Harbor Freight long reach ones needs a new battery.

I was hoping the notch machined into the top of the piston meant it was to go to the front. There were no instructions with the kit.

Thanks Guys, Ed

sunbeam · Apr 26, 2020

If they are offset you should visably see it looking at the side of the piston

piston direction

Ed Womer

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sunbeam

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Steve@Advance

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Ed Womer

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sunbeam

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