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

[Frank]

ok Duane I'll bite............
how does that compare to the D valve?

Frank
gremaux at tein.net
Central Montana
http://www.angelfire.com/mt/deeregp/index.html
----- Original Message ----- 
From: "Duane Larson" <jdlarson at comcast.net>
To: "Antique John Deere mailing list" 
<antique-johndeere at lists.antique-tractor.com>
Sent: Thursday, December 23, 2004 8:39 PM
Subject: Re: [AJD] can I use the 820 exaust valve in my D?


> Kevin,
> The 820 valves have the following properties as given in Field Service
> Bulletin 259 (11/56):
> property    intake    exhaust
> angle        44.5 deg    44.5 deg
> length        8.281"        8.250"    to top of face
> dia            2.600"        2.070"
> stem        0.496 - 0.497"   (both)
> Duane Larson
>
> ----- Original Message ----- 
> From: "Kropelin" <kropelin at netonecom.net>
> To: <antique-johndeere at lists.antique-tractor.com>
> Sent: Thursday, December 23, 2004 7:13 PM
> Subject: [AJD] can I use the 820 exaust valve in my D?
>
>
> Not long ago a few posts had talked about being able to use the 820 
> exhaust
> valves with a little bit of machine work.
>
> 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.
>
> 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.
>
> 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!
>
> 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.
>
> 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
>
>
> 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.
>
> Any advise on this will be greatly appreciated.
>
> Kevin Kropelin(krop8913)
>
> over here in the cold southwest corner of Michigan
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