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TO20 Piston Identification

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Author  [Modern View]

02-12-2021 17:11:29

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I am rebuilding a TO-20 for my wife. It was her pappys tractor.
When I took the head off all the pistons were evenly coated with carbon.

The exhaust valves were all not the same color.

I was really confused after cleaning off the piston tops. All I notice is the direction indicator and the letter "P" stamped into the top. I was expecting "STD" or something like a number indicating a over sized piston. What does the "P" stand for?

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02-18-2021 10:57:35

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 Re: TO20 Piston Identification in reply to pburchett, 02-12-2021 17:11:29  
I responded to this post in Tractor Talk, so can't send the same reply twice.

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02-12-2021 20:53:22

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 Re: TO20 Piston Identification in reply to pburchett, 02-12-2021 17:11:29  
The P is probably a factory sizing mark or an inspection stamp.

I've never seen overbored sleeves, typically they are purchased as a new assembly fitted with a piston, rings, and pin.

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Tom h.

02-12-2021 19:56:54

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 Re: TO20 Piston Identification in reply to pburchett, 02-12-2021 17:11:29  
P for plus? Might be over bored piston and sleeve. Looks like a good engine though, just need to be lovingly rebuilt.

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