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John Deere Tractors Discussion Forum
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46 model B, dual fuel pistons.

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Ken Tabor

01-19-2005 19:27:53




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I am ready to start rebuilding the engine on the 46 B. All the machining has been done on cylinders, heads etc. It is a dual fuel model, gas and distillate. Ordered new pistons 45 thousand over size. The old pistons are essentially just typical flat top cylindrical pistons. The new ones have a taller "crown", meaning they are taller from the wrist pin to the top of the piston and they aren't flat on the top but have a groove on each side, top surface, like something you would see on a auto piston possibly for valve clearance. The supplier that I bought them from said they will work fine in my engine. Just got to thinking that they will likely increase the compression. Would this negate the ability to run on distillate fuel or kerosene?. I don't plan on using this tractor for anything but an expensive garage queen and lawn ornament but if I am going to restore it, would like to keep its original capabilities. Appreciate comments, Thanks, Ken

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BushogPapa

01-20-2005 20:34:18




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 Re: 46 model B, dual fuel pistons. in reply to Ken Tabor, 01-19-2005 19:27:53  
Do you really think you will ever use "distillate" in your "B"..?? It costs more than gasoline now, and your "B" will use far less gas with the higher compression pistons (have more power too). If you are a "purist" and want to run Distillate, then you Must use the lower compression pistons... Take your pick...!!

Ron.



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Clooney

01-20-2005 14:29:07




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 Re: 46 model B, dual fuel pistons. in reply to Ken Tabor, 01-19-2005 19:27:53  
Ken, it sounds like you have gasoline burning higher compression pistons..

If so you will have a hard time using kerosene or tractor type fuel as those fuels have a very low octane rating & won�t function very good in a higher compression engine without knocking.. (Will burn good but will knock like crazy)

Before installing those pistons make sure the pistons have cut-outs & will clear the spark plugs & plug holes or the spark won�t reach the combustion mixture..

Clooney

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Mike M

01-20-2005 05:37:41




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 Re: 46 model B, dual fuel pistons. in reply to Ken Tabor, 01-19-2005 19:27:53  
Deere used to offer a gas piston for those years.
I found some nos ones when I rebuilt mine. They really wake them up and I did try kerosene in mine just to see what it would do.At an idle it ran ok put it in gear and started to drive as soon as I got to a very slight grade in the drive it started to pull a little and this made it KNOCK big time.I shut it down quick and it stills seems ok I don't think it screwed it up.

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