Re: advice on 4020

Posted by jdemaris on January 26, 2004 at 05:40:29 from (209.23.28.35):

In Reply to: advice on 4020 posted by scott on January 25, 2004 at 19:15:27:

What you describe is not necessarily something to worry about; I've seen new and rebuilt tractors (of that vintage) do the same thing. On the other hand, if you know for sure that at one point in time, your 4020 burned clean, and now it doesn't, then that's a different story. There are many things that can cause such a problem, e.g. ring-gaps that are lined up with each other, excessive ring side clearance, fuel injection timing not advancing enough, etc.
You ought to try to ascertain if the problem is isolated to one or two cylinders, or the whole engine in general. Start it cold with the exhaust manifold off and see how many ports are making the smoke. You also may notice, in the removed exhaust manifold, that certain ports will have excessive carbon buildup. This might help you narrow things.
I think at this point, though, it would behoove you to check the timing advance, and/or try advancing the static timing a few degrees and see if it makes any positive difference.

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