How a VNT turbo works with diassembly and DIY repair of sticking vanes

[ingsoc]

This has to be one of the most straightforward explanations of a VVT on the internet. Really good description of how it works. DIY mechanics shouldn't be fearful of tackiing this job. Thanks for sharing

[abhishekpradhan]

Can't thank you enough. I hv been suffering with frequent CEL n limp mode for the last 3 months. No service centre nor "expert" mechanics could diagnose the cause (even with official scanning). Their conclusion was the ECU is kaput n i ought to buy a new one.

After sumbling on to ur video today i opened and cleaned the turbo myself and the issue is fixed.

THANK YOU.

[michaelbruce]

By far, the best video explanation I've seen of how these turbos work and why they have issues. I was hoping the notchiness I felt in the actuator moving was from the actuator rod, unfortunately it's coming from the actuator lever on the turbo/vanes. After watching this, I'm way more confident cleaning the turbo. Thanks!

[vasiavisilievic]

Important to keep in mind: the turbo spins at over 120 thousand rpm, which is 2000 revs per second. A tiniest scratch, nick or bend on the turbine or compressor wheel will throw it out of balance, meaning reduced rpm of the turbo, and damaged turbo bearing.

[NRHN]

Watched the theory at 'Engineering explained' and came here to watch the practical. Bravo to both you guys! Excellent work...

[rigatrn]

"LIMP MODE" I subscribed instantly after you explained that, I've been having the issue you describe on my Open/Vauxhall Signum 3.0 V6 CDTI 03, I'm a newbie to turbos and all the mechanics around here say don't touch it and buy a new one but I want to learn more about the unit and how to fix it myself, brilliant video, thank you

[chesneyhawkes]

Best turbo cleaning description so far thanks.

[gabitrandafir]

I used Winns turbo cleaner spray. Sprayed a whole can in the turbo while the engine was on idling. Gave it 10 min took it for a spin and i can't believe it did the job. Easy cheap fix. And no service gave me this cheap option it was a last resort thing to see if it worked. They wanted me to recondition the turbo...car works fine now.

[Shaker]

Extremely nice seeing this live with no animation. Even if you already know how VNT / VTG turbos / VGT work, it's great to really see this once. Thank you!

[mrhillclimber]

Perfect explanation and has given me the total insight as to why mine overboosts as with vacuum connected the turbo arm moves less than if I move it manually, and I can feel it dragging inside...now I understand why....brilliant explanation thanks!

[adrianrabone]

Brilliant video. Answered my question where all other forums failed, and that is "there is no wastegate in these type of turbos". I have been searching for info on the Vito 111 cdi wastegate all week after reading on the Mercedes forum that this is the the reason my Vito keeps going into limp mode. The sticky actuator is for the variable vanes not the waste gate. I wish ill informed people would keep their mouths firmly shut !!

[TheQuickBrownFoxTV]

Brilliant video. Thanks. I'm a self taught newbie to all this, and this was really helpful.

[chrissalter]

Thankyou, ive been suffering major overboost/limp mode issues, im not getting full travel on the vnt lever but i didn't understand whether up was open or closed, after watching this video i fully understand whats causing my problems.

[calkoho]

The best video on explaining and cleaning your VNT Turbo

[navashuskies]

makes me want to go outside and take my turbo apart!! Nice video, well explained!

[ciobanuvalentinmail]

Super told.
For the first time i had understand how it's work.
Thank you.

I have a issue with a overboost.
I had mounted a gauge vacuum on the line to vaccum acuator.
When i press the clutch i have a little to 90% vacuum and after small pitch the vacuum drop to 20 or 10.
After 100km/h, i had limp mode with error overboost.

It's seems that the vane are not clossing.

The actuator moves ok, but as i understand from you, i can have that gap, that keeps the vanes open a little...

Hmmm, i have to dismantle...
In the summer i think...

Thanks again...

[doraexplora]

The Transit is the first Turbo I've owned with a VNT. I bought a new one and had it replaced, never knowing really what it did. The magic words here were 'a VNT system doesn't have a BOV" or something to that effect.

[camgreer]

Great camera work, clear explanation, excellent job.

[nosnoj]

If you are doing this yourself at home mark the oil inlet position on both housings before you take it apart, saves problems on reassembly.

[stuartchallenor]

Superb explanation ... I'm a reasonably good home mechanic.. owning a mitsubishi L200...and didn't know exactly how these vanes work .... probably never take a turbo apart ...but it's nice to know how they operate... thanks