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John Deere Tractors Discussion Forum
Show Parts for Model:

Re: JD 70 Exhaust Manifold Valve

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F-I-T

11-29-2012 18:08:54
184.6.247.3



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Bruce, it's been years since I had two side by side to compare, but if I remember correctly, the all-fuel valve is close to the same port size on both flow through and by-pass as compared to the gas. The gas one has quite a difference in flow-through compared to by-pass. I think because they wanted the all-fuel to be hot versus hotter all the time, where as the gas needed to be REALLY cooler on hot weather.

I believe you could modify a gas valve to be an all-fuel valve if you wanted to grind and mill, if you had a broken all-fuel valve to go by.
This post was edited by F-I-T at 18:09:49 11/29/12.

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Blksmok

11-29-2012 20:25:29
67.209.80.17



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 Re: JD 70 Exhaust Manifold Valve in reply to F-I-T, 11-29-2012 18:08:54  
Frank..I can't remember exactly what the heat exchanger valve looks like on a 70 gas. The all fuel valve is the same shape and dimensions (I think) but in addition to the large rectangular opening that routes the exhaust gas from the flywheel side cylinder to the front of the manifold where the carb bolts to...there's a circular 3/4 inch opening that routes some exhaust gas at the same time to the back side of the manifold. Can't recall if the gas manifold valve has that small hole (???) This 70AF is a "project" that has an interesting history...otherwise I wouldn't be trying to resurrect it. It started it's life in Montgomery, Alabama and somehow found it's way to Wisconsin. Surprisingly, I have a 70 diesel with the same lineage. Wonder if these were "dealer swaps" due to them not selling in Alabama (???)

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F-I-T

11-29-2012 20:36:03
184.6.247.3



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 Re: JD 70 Exhaust Manifold Valve in reply to Blksmok, 11-29-2012 20:25:29  
Quoting Removed, click Modern View to see

Wow. Could be.



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