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Tractor Talk Discussion Forum

Difference between Crankshafts for Ford 6610 and 5

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AlexL

05-23-2005 08:20:33




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I"ve got a crankshaft model#C5NE6303K, which is supposed to be for the 5000. I"ve got a 6610 which needs the crankshaft replaced and after checking online, saw that the crankshaft for 6610 looks the same (D9NN6303AA) as the one for 5000. Does anyone know what the difference between the two is? Are they interchangeable? Thanks.




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Rod F.

05-24-2005 08:43:36




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 Re: Difference between Crankshafts for Ford 6610 a in reply to AlexL , 05-23-2005 08:20:33  
I believe the later 5000's, and definitely the 6600,and the 5610 used the 256 cid engine. The 6610 used the 268 cid engine. The blocks are all basically the same, for a given year. The stroke is the difference. The 256 engine has a 4.2" stroke, while the 268 used a 4.4" stroke. Both have the same bore, at 4.4". Early 5000's and the 5600 used a 233 cid engine, with a 4.2" bore and a 4.2" stroke. There may be other differences as well regarding the balancers, so the short answer is that the cranks are not interchangable. I suppose it could be done, if you wanted less displacement, and got the different rods and pistons to match the crank you have, if you could ensure that the balancers were the same. It would be cheaper to either have the crank turned, or buy a new crank for the 6610. HTH.

Rod

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AlexL

05-24-2005 09:30:36




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 Re: Difference between Crankshafts for Ford 6610 a in reply to Rod F., 05-24-2005 08:43:36  
Thanks for the information. Physically, is there a difference between the two crankshafts? I mean if you look at both of them, can you tell the difference? How would I be able to measure the stroke?



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Rod F.

05-24-2005 19:58:37




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 Re: Difference between Crankshafts for Ford 6610 a in reply to AlexL, 05-24-2005 09:30:36  
Ahhhh, one of those little problems..... There isn't much way to tell them apart that I am aware, unless you can get a very accurate measure of the crank throw. VERY VERY accurate. The 4.2" crank will have .1" less throw than the 4.4" crank. I don't know if I'd even attempt that stunt myself, and I've got as much evil engineer in me as anyone. A tenth of an inch is not much, especially when you can't get an accurate position to measure from. One suggestion I could make would be to project a straight edge down the centerline of the main journals, and try to take a measure from that to the outside of the rod journals with a large caliper, then subtract the radius of the rod journal. That should give you the crank throw, which doubled will equal the stroke. I'm into some very "free thinking" right now. Take it for what it's worth. Perhaps a better alternatitive, if you don't mind the work, is to drop each crank in a block, and assemble a rod and piston to it, then measure the stroke it produces. That will give an accurate measure with depth gauges, but it's a bit of work. I'm sure there are casting numbers as well, but I have no idea how to decipher what they mean. I hope you don't have two used cranks sitting side by side on the floor..... Good luck.

Rod

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