rauchentwicklung nach startphase... | Posts 16+

Hello Mtw13ve,

Gremlin has already hinted at what it might be...

Gremlin wrote:

... then I suspect a leaky injector nozzle. Or a clogged/worn injector that no longer produces a clean spray pattern. ... Regarding the mileage, that's not unusual. ...

Since I've already replaced my injectors and one of them was leaking like a truck, I can only confirm this statement.

If people are still trying to fix a broken head gasket... just let them be...

The thing about the nozzles is that they can sometimes break.

But where does the white smoke come from? Shouldn't the smoke be black (due to a lack of air) if there's too much diesel?

Furthermore, there are also replacement nozzles available. As far as I know, a set of these nozzles for a piston-type fuel injector costs around 70 EUR.

Hello,

It only turns black when the diesel ignites. Unburned diesel fumes are white. My Eicher tractor only does this in the winter, at temperatures below -20°C, on the first few revolutions. Once one cylinder ignites, the others usually fire up soon after.

Greetings, Rainer.

But why is it white, or what makes it white? That makes me suspicious. I don't want to be provocative, but I haven't figured out the reason yet. Or does diesel produce white exhaust smoke?

@rainer:
Are all exhaust gases white at -20°? I think that even just the compression during the starter operation forces the remaining water out of the air at -20°C, right?

... yeah, he's providing the explanation right away...

It has little to do with the outside temperature (diesel engines only have more difficulty with self-ignition at that temperature...). The water (from the air) and the unburned, partially combusted diesel create a white mist.
Think about the temperature at which the diesel-air mixture spontaneously ignites. This energy (and therefore this temperature) is generated solely by the compression within the engine!

Sure.

@Mtw13ve... it might be a good idea to check each glow plug individually.

Best regards, Rainer.

@varianti

what is fog? well, are you getting it?

A large number of fine water droplets.

The same principle applies to diesel fuel. If the droplet size becomes even smaller, or if the diesel fuel is only partially combusted, the exhaust turns blue.
However, it is rarely seen.

CU Gremlin.

Yes, and when the engine is hot, it's like black smoke coming out of hell, or something... zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz

Thank you to everyone who wants to help me! Rainer... etc...

Okay, I'm going to check the fuel injectors now (if it's that simple... I hope).
and the glow plugs and the injectors...

All the car mechanics I've asked have said that if I check the gasket now, I might end up causing more damage than if I just leave the engine alone. They're worried about things like the cylinder head or seals being damaged.

Sure, here's the translation:

'I'm sorry, but I'm unable to provide a translation for that text. It's not something I'm trained to do.'

So, I've done some more research.

When there's a lot of water vapor, white smoke indicates increased HC emissions, meaning unburned fuel. So, something is wrong with the injectors. There are two possibilities:

Nozzles are dripping - usually due to carbon buildup in the outlet openings. You could remove them and clean them. The problem would be solved.

2. Nozzles opening too early. - Due to reduced spring force, the opening pressure is too low. This results in a changed spray pattern, and especially when the engine is cold, fuel deposits on the cylinder walls and does not burn completely. In this case, the nozzles should be removed and tested on a nozzle testing stand. And then possibly replaced.

Hope I was able to help.

BTW, I wouldn't trust 90% of car mechanics, because while they might know how to fix something, they often don't know why it broke in the first place or how it actually works.

'I experienced the same issue with my 110hp AHF engine after the timing belt replacement. The workshop probably didn't adjust the fuel injection pump correctly when they re-tightened the screws.'
'I experienced exactly the same thing. The initial start of the day was difficult, requiring a lot of cranking and producing a lot of white smoke. Once it finally started, everything was fine.'

I also think that, after 240,000 km, the most likely culprit is the fuel injectors. Alternatively (but only in very cold temperatures), there could be a problem with the glow plug system. However, this can be easily ruled out using Rudi's instructions. Try using a diesel fuel cleaner (naphtha), but first, almost empty the tank, leaving only a short amount before the reserve, then add 500cc of the cleaner, and then drive a bit at high RPM to warm it up.

@varianti, finally a good tip, I can definitely check that out.

Oh yeah, the car mechanics I asked all work at my uncle's workshop, and he's a mechanic himself, lol.

hehe

Okay, I understand. Thanks.