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John Deere Tractors Discussion Forum
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30 and 40 series vs. 50 series engines

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JD Jim A.

12-11-2004 19:52:17




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I see a lot of 30 and 40 series tractors advertised as having the 50 series engine installed. What were the improvments, and how can a guy tell the difference?




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Walter Squires

12-14-2004 13:32:48




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 Re: 30 and 40 series vs. 50 series engines in reply to JD Jim A., 12-11-2004 19:52:17  
I have had two friends that have 50 series tractors have the engine go bad from the water pump going bad and leaking coolant into the crankcase, wiped the engine before they could catch it.



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G/MAN

12-13-2004 04:42:18




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 Re: 30 and 40 series vs. 50 series engines in reply to JD Jim A., 12-11-2004 19:52:17  
That depends on how old the 40-series engine is. Late 40-series 6466s had the crank-driven oil pump just like the 50-series engines did. The cylinder heads were pretty much the same on both styles. Of course the 6466 didn't come out in a row-crop until the introduction of the 40-series, so if you're comparing that to a 30-series, the 30-series would have the 6404 engine. As matthies mentioned, a big difference is the gear-driven water pump and the fact that the fan drive would be bolted to the front of the head instead of on the water pump. I think there also might have been a piston change, with the 50-series parts becoming the service parts for the 40-series engines. And most earlier tractors I've seen listed as having a 50-series engine have been 4wds, at which point you start dealing with the 6619 engines in the 8430, 8630, 8640, etc. The 8440 and 8450 used the 6466, which is a better engine IMHO.

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matthies

12-12-2004 19:53:20




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 Re: 30 and 40 series vs. 50 series engines in reply to JD Jim A., 12-11-2004 19:52:17  
The main thing is that the oil pump is crankshaft driven, instead of camshaft driven. Also the water pump was gear driven instead of belt driven.



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fredy

12-12-2004 11:06:49




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 Re: 30 and 40 series vs. 50 series engines in reply to JD Jim A., 12-11-2004 19:52:17  
i think the 55 series engines had a better head design and they were called 7.6 rather than 466,same thing. 30 series still had the 404ci engine. mabe the 50's had the new style too....



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