Nissan CD17 crni dim

[gorans]

Primetio sam da je moj nisan poceo da dimi crno u zadnjih 4-5 hkm.Radi se o klasicnom atmosferskom dizelu stare generacije sa BOSCH KIKI pumpom.Nov je filter vazduha i nafte a dizne su radjene pre jedno 15000km.Bosch pumpa koliko je meni poznato nije dirana bar 150 000km.Da dodam da auto odlicno vuce,pali na prvi okret anlasera i ne trosi ulje.Sta bi mogao biti uzrok?

[zoranbg]

Re: Nissan CD17 crni dim

DIESEL TROUBLESHOOTING BLACK SMOKE

Black smoke is usually a signal that there's too much fuel, not enough air or injector pump timing is off. One of the most common causes of this condition is an air inlet restriction. The cause may be a dirty air filter, a collapsed intake hose or even an exhaust restriction. Diesels are unthrottled so there is no intake vacuum to measure.

previse goriva , nedovoljno vazduha ili se tajming pume pomerio. jedan od najcescih uzroka restrikcija ulaza vazduha.pa cak i zapusen auspuh.

evo ovde : http://www.aa1car.com/library/diesel.htm

pa cak i pomocu obicnog unimera moze preko merenja otpora grejaca dok motor radi (naravno mora da se raskace sa zajedniskog kabla) , moze da se utvrdi razlika u temperaturi sagorevanja za svaki cilindar.

The resistance of the plug goes up with temperature, so if one or two cylinders read low, you've found the problem. For example, if a glow plug normally reads 1.8 to 3.4 ohms on a hot, running engine, a reading of 1.2 to 1.3 ohms on a glow plug would tell you that cylinder isn't producing any heat.

Otpor raste kako raste temperatura grejaca,tak oda ako je na jednom ili dva cilindra ocitavanje nisko,nasao si problem.
Na primer ako je normalno ocitavanje otpora od 1.8 do 3.4 oma na vrucem motoru koji radi . ocitavanje od 1.2 do 1.3 oma na grejacima ukazace na to da taj cilindar ne proizvodi sam nikakvu toplotu.



ili ovde :

Black smoke is the most common smoke emitted from diesel engines. It indicates poor and incomplete combustion of the diesel fuel. There are many causes, including…

Incorrect timing

Dirty or worn injectors

Over-fuelling

Faulty turbocharger (ie not enough air to match the fuel)

Incorrect valve clearance

Incorrect air/fuel ratio

Low cylinder compression (eg sticking piston rings or worn components)

Dirty air cleaner

Restricted induction system (eg system too small or kinked inlet piping)

Other engine tune factors

Poor quality fuel

Excessive carbon build up in combustion and exhaust spaces

Cool operating temperatures

http://www.dieselsmoke.com.au/