JD engine black smoke when under load

[chamberlainguy]

i have a chamberlain 3380 which has 5800 hours and it smokes very bad when working but clear as day when at idle and at high rpm with out load.
has a cav lucas pump
new injectors
i am thinking that it may be the fuel adjustment
than one got any ideas

 

[rustyshakelford]

Starting the with basics, air filter clean and no restrictions. Does it have a turbo? Check for charged air hose leaks. Black smoke isn't necessarily bad depending on how much it is. If it's cugging dark black smoke than I would suspect the egts were pretty hot.

Did it just start doing this? Pumps don't usually just start feeding more fuel for no reason. Maybe the injectors aren't the right size and it's getting more fuel? We need for info

Brett

 

[chamberlainguy]

No turbo and the smoke is not black but a dark gray, I will check air filters

 

[chamberlainguy]

And has been doing it for a while

 

[thepumpguysc]

Pull the air cleaner completely out & see what that does..
You can advance the timing on the pump by loosening the 3 mounting screws/nuts and turning about a dimes width OPPOSITE the arrow on the name plate.
OR if so equipped, check the "thermo start" in the intake manifold, for constant fuel, dripping into the intake.. seen that 100 x..
but that usually smokes ALL the time.. good luck & post back w/ findings..

 

[Fallon]

Black smoke is unburnt fuel coming out of the exhaust stack. So as others have noted either not enough air or to much fuel.

 

[DEWFPO]

On a properly working, non-electronically controlled, diesel engine you also can get black smoke when you apply too much load for the rpm setting. The injection pump is putting in x amount of fuel and the load applied to the engine is not allowing the rpms to come up or is dragging it down. A similar net result to not enough air or too much fuel.

DEWFPO

 

[Gary Fowler]

I have seen old iron tractors from the 1970s era that when heavily loaded would leave a trail of black smoke for 1/4 mile behind you. Nothing wrong with the engine, just loaded up heavy. I had a 1984 Yanmar with turbo that would put out some grey/black smoke when it got overloaded also. As long as your air filters are clean and you have no air leaks do not worry about it.

 

[Texasmark]

i agree with the above. My first knee jerk was when you said you replaced the injectors; that disqualified my first reaction....dirty/malfunctioning injectors. Only other thing I could add to the above comments would be to work some "snake oil" through the crankcase and fuel and clean out any carbon build up you may have. I'd do that as a matter of course anyway. Power Services is readily available, does a great job and is moderately priced.

 

[LD48750]

Black smoke is a sign of POWER.
Next you'll be looking to get a foot of FLAME standing out of your stacks...