Diesel smoke issue

[Supernoodle]

I've never seen a dripping common rail injector before.
They can drift (deliver a different quantity to that demanded), but nearly always drift to deliver less. The main factor in this is coking of the nozzle.
The nozzle can erode and adversely affect spray pattern.
The control valve can wear or get contaminated, which the means leak off increases.

Dripping injectors must cause rail pressure control problems?

 

[Jobsworth]

I've never seen a dripping common rail injector before.
They can drift (deliver a different quantity to that demanded), but nearly always drift to deliver less. The main factor in this is coking of the nozzle.
The nozzle can erode and adversely affect spray pattern.
The control valve can wear or get contaminated, which the means leak off increases.

Dripping injectors must cause rail pressure control problems?

https://m.facebook.com/Fredholmesfuelinjection/videos/2574408119501891/

 

[Supernoodle]

https://m.facebook.com/Fredholmesfuelinjection/videos/2574408119501891/

Is that a returb injector?

 

[Jobsworth]

Is that a returb injector?

This is what we see with original aged injectors occasionally. I wouldn’t say it’s hugely common, but see a few. Symptoms are smoke after long period idling. The smoke is white/grey and smells horrible. Testing is not expensive and will spot a dripping one immediately. In my experience if you have one dripper they’ll all be doing it. Had one last month, 5 out of 6 were dripping. No brainer to replace them all.

 

[Supernoodle]

I worked for 10 years at Bosch on other OEM programs. Never saw this so would love to know what the failure mechanism is here. Vehicles remapped?

 

[Jobsworth]

I worked for 10 years at Bosch on other OEM programs. Never saw this so would love to know what the failure mechanism is here. Vehicles remapped?

No, most I’ve seen are stock. Never seen this myself with the later blue efficiency om642 injectors. The early om642 seem worst for it.
I’ve run an independent mercedes specialist for the last twenty two years just to give you some idea

 

[mersum1es]

I've never seen a dripping common rail injector before.
They can drift (deliver a different quantity to that demanded), but nearly always drift to deliver less. The main factor in this is coking of the nozzle.
The nozzle can erode and adversely affect spray pattern.
The control valve can wear or get contaminated, which the means leak off increases.

Dripping injectors must cause rail pressure control problems?

Eventually peeing injector drills a hole to piston. Not my own experience but read a few cases. But then there has also been heavy knocking sound as a advance hint.

 

[BlackC55]

I worked for 10 years at Bosch on other OEM programs. Never saw this so would love to know what the failure mechanism is here. Vehicles remapped?

The drippy injectors usually fill the sump with fuel too. OR the DPF is trying to regenerate unsuccessfully and the injectors are fuelling to what they are told to do but the combustion process is not able to cope with the quantity of liquid. The first thing the driver notices is a high oil warning.