[AJD] can I use the 820 exaust valve in my D?

[John D. Swecker]

Kevin, the stem is about 1/2 in. in diameter, and the overall length is 
8 3/8 in. The head is 2-1/2 in diameter. (intake valve)    John D.

Kropelin wrote:

>Not long ago a few posts had talked about being able to use the 820 exhaust
>valves with a little bit of machine work.
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>As I am rebuilding a 1931 unstyled D and have just removed the head to clean
>out the years accumulation of grass,mouse nests,grain storage and wasp nests
>I have gotten the valves out and of course they need to be replaced.
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>As you already know they are a little salty, and like most I really do not
>want to make John Deere Co. rich but I want to do a proper job.
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>My question is does anyone have the physical dimensions of the valve for the
>820 as far as diameter of the stem and the head diameter? I will assume that
>the length is longer which will allow for the relocating of the keeper slot!
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>I went over to my local Deere Dealer and all they could tell me was that I
>can still buy them but they had no tech info.
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>I thought that this was a little funny as they do repair tractors in house.
>What I need is the tech specs of both of the valves to make a determination
>of which way to go outside of having them order a valve in for me to look at
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>If the head diameter is the same and the stem diameter is the same and the
>overall length will allow me to machine a new keeper slot in the proper
>place, then the 820 valve which is half the cost of the original style valve
>would be the way to go.
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>Any advise on this will be greatly appreciated.
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>Kevin Kropelin(krop8913)
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>over here in the cold southwest corner of Michigan
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