Hey fellas the past week I made my own engine stand and put the flatie in there, The engine wasn't rotate, and pull out the heads, one head marked 59 ab and the other 59 a, really don't expecting nothing good, What I found: only one piston stuck with deep rust ( the cylinder wall corroded ) and I notice they had cylinder sleeves, another find were the connecting rods marked 8ba, may be had the 8ba crank, I don't know how recognize the crank?, only I saw the two holes in the bearings...
You have an 8BA crank (2 oil holes per journal) and 8BA rods (insert instead of full-floating). The 59AB full-floating rods had two rods per set of rod bearings and only one oiling hole on the crank. http://www.vanpeltsales.com
Those bearings are full-floating, but the rod pictured has a locating tang for insert bearings (photo 12), which makes it 8BA (not to mention the fact that it is marked 8BA).
The floating bearings can be used with the 8ba rods, but I'd use the correct fixed insert 8ba bearings. They're easier to fit and much cheaper. That said, you should measure the bore diameter of the crank bearing end of the rod very carefully. If they've been run a lot of miles with the floating bearings there could be some wear that would lead to problems with the fixed inserts. Bob
Not sure if that helps any, but when i took mine apart, it seemed like there were no two pieces that had the same numbers or markings on them. What I'm trying to say, you can use different stuff together and make it work. At least that's what the previous owner of my flatty did...
Another opinion from ford barn saids, I have one of those odd motors that were made for the Canadian military. It is running a later 8BA style crank and rods in the earlier 59A block. It uses a special floater style bearing in the insert type rod. I hear the bearings are next to impossible to find. Check out the crank and bearings real well, they may be usable as is, if your lucky.
Si el cigueñal tiene dos agujeros por muñon, uno para cada biela, es un cigueñal de 8ba (49-53). Si las bielas dicen 8Ba son por supuesto de un 8ba (49-53). El 59ab tiene un solo agujero de aceite por muñon ya que usa un solo cojinete cada dos bielas. No sé porque hacían esas burradas acá, supongo que faltarían repuestos y usaban lo que tenían a mano. En el 255 de mi mercury habían usado metales para bielas de 59ab (flotantes, las de tu motor) y se tomaron el trabajo de modificar las bielas para usarlas. Cualquiera. Medí la alzada del cigueñal, si tenés un poco de suerte y es de 4" pulgadas tenés un cigueñal de Mercury. Si es de 3.75 es un ford. http://www.flatheadv8.org/boomer/crank.htm
Si es que las modificaron (seguro), te conviene cambiar las bielas y usar los metales que corresponden (uno por biela). Se consiguen esas bielas nuevas acá si tenés paciencia. Ayer compré 8 nuevas fomoco sin usar paa 59ab. Hace un tiempo había unas 8BA en venta. Hablá con Gustavo de todomotorco.
Gracias por la data estuve pensando dejar las bielas esas y conseguir cojinetes flotantes!! tengo que rectificar el cigueñal y hablar con Gustavo para ver si me consigue esos cojinetes dobles flotantes en supermedida, me gustan más porque tienen un menor punto de fricción entre el conjunto muñon, cojinete y biela es decir menos posibilidad de fallo, por acá o en Ford Barn me dijeron que el cigueñal con dos agujeros de lubricación y cojinete doble era una configuración muy usada en las carreras anteriormente
Si, tenés razón. Recién les presto atención a las fotos y veo que el cigueñal es 8ba. Vi que Ol Ron en Ford barn dice que para armar motores para correr prefería usar los cojinetes flotantes. Ese tipo parece que sabe y bastante. Asi que si el lo dice.
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