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Tractor Talk Discussion Forum

advice on 4020

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scott

01-25-2004 19:15:27




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I have a 1968 that leaks black crud (ie.oily carbon or fuel) out the exhaust manafold only during winter months and when tractor is warmed up
smokes a little white/blue when cold but soon clears up so far I have put in new injectors, rebuilt inj.pump had machine shop check cylender head and sleves/pistons looked good honing cross marks still visable has 30psi@1900 of oil pressure this has realy got me stumped any ideas what to try next thanks.. ps is a broken oil ring possable

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Bob

01-26-2004 08:37:10




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 Re: advice on 4020 in reply to scott, 01-25-2004 19:15:27  
When it is cold, any unburned fuel, and water vapor that is a by-product of combustion condenses in the exhaust system, and mixes with the soot deposits already there, and you have "wet stacking".

Make sure you have a good thermostat, and cover a good portion of the radiator with a sheet of cardboard to hasten warmup to 180 - 195 degrees.

Watch your thermostat, and remove some of the cardboard, if necessary, to prevent overheating.

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Mike w j

01-26-2004 07:28:43




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 Re: advice on 4020 in reply to scott, 01-25-2004 19:15:27  
how high does the temp gauge go when you work it in 1968 1 qt. of oil a day wasn't excessive. when you work it does the crud quit leaking I would almost bet if timed right then it must need a thermostat



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jdemaris

01-26-2004 05:40:29




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 Re: advice on 4020 in reply to scott, 01-25-2004 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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ChrisL

01-26-2004 03:10:15




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 Re: advice on 4020 in reply to scott, 01-25-2004 19:15:27  
there was a post somewhere in a forum here about a new NH doing that - the guys decided it was only in the winter - it is unburnt diesel because the tractor when idling isn't hot enough - check the thermostat was whar was said - it was around the turbocharger on that one - within a month ago or so



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Don

01-25-2004 19:25:21




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 Re: advice on 4020 in reply to scott, 01-25-2004 19:15:27  
I think you should run a compresson check broken rings are possible
How much blow by do you have Don



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Billy ar

01-27-2004 12:51:56




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 Re: Re: advice on 4020 in reply to Don, 01-25-2004 19:25:21  
You did not mention what oil you were using, we had an 856 IH that would do this on 30 wt. Started using 15-40 wt it stoped.



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scott

01-25-2004 19:48:23




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 Re: Re: advice on 4020 in reply to Don, 01-25-2004 19:25:21  
Don comparing to my other 4020s about the same amount of blow by however when I work it hard like on 6-row stalk chopper 4th gear for 4-5 hours I feel I need to stop and check oil level and will notice a drop in the level after oil drains back down in pan 30 min. or so half to add half a quart to it but under light duty loader work I'll check at time to fuel up and oil level is ok thaks.



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