Posted by georgeky on January 01, 2008 at 19:12:21 from (64.12.116.73):
In Reply to: Re: IH 656 Questions posted by Joe Godoy on January 01, 2008 at 14:19:09:
The biggest difference is in the engines. The 656 used the old glow plug type engine. If glow plugs don't work it won't start unless you pull it or use ether. The 666 and early 686 had the American built D-312 which starts well in most temps. without glow plugs, but does have an ether injection system. The newer 686 used the German built D-310 engine. It is my opinion as well as many others that the D-312 is one of the finest engines ever built by anyone. Standard hydraulic pump for late 656 all 666/686 was the 17 GPM for everything except the 3 point hitch They and 656 have a seperate pump for the 3 point hitch. Early 656 used a 7 gpm lift pump and late 656 and all 666/686 used a 9gpm lift pump. Any of the 3 are very good tractors. The biggest difference is that the 666/686 start a lot easier on cold mornings.
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