Diesel white smoke what's up?

RayP(MI) · Nov 19, 2020

Neighbor has a JD 4000, that emits white,
(blue or gray depending on the light.)
Doesnt seem to matter if under load or
not. Wondering what most likely problem.

My diesels dont smoke like that. A little
black maybe under some circumstances.

kencombs · Nov 19, 2020

Probably unburned fuel. Could be an injector bad/dirty, low compression etc.

guido · Nov 19, 2020

Hello RayP(MI),

Is is incomplete combustion. Most likely, a bad, dribling injector. Valve timing could be another reason too. Isolating the cylinder-s not fully firing is one way.

May be a valve adjustment is in order, as late valve timing will affect combustion, amongst other factors, from fuel pressure to restricted air cleaner, to mention a few,

Guido.

J. Schwiebert · Nov 19, 2020

How does it start? Will the engine warm up (bad thermostat?

grizz02 · Nov 19, 2020

is coolant low?

buickanddeere · Nov 19, 2020

Unburned vapour from fuel , oil or coolant .

Farmer Rock · Nov 19, 2020

I am assuming this is a diesel,so if it is white smoke it is a fuel issue,and if it is blue smoke it is blow by.Does it have any noticeable loss of power?if so,it probably the fuel filter(s) or air intrusion.

Rock

Dieseltech · Nov 19, 2020

Diesels that have white smoke is usually caused by low compression, or late injection timing. Start with checking timing, adjust if not to spec. Next is removing all injectors for a compression test, should be 350-400 PSI for a clean exhaust. Engines will run at 300-325 when warm, but don't start well cold and could have white smoke cold until engine warms up. Also make sure the thermostat is working right too, running too cold will aggravate white smoke.

Diesel white smoke what's up?

RayP(MI)

Well-known Member

kencombs

Well-known Member

guido

Well-known Member

J. Schwiebert

Well-known Member

grizz02

Well-known Member

buickanddeere

Well-known Member

Farmer Rock

Member

Dieseltech

Well-known Member

Similar threads