What causes a turbo to blow....

Discussion in 'Freightliner Forum' started by nikmirbre, Nov 10, 2018.

  1. nikmirbre

    nikmirbre Road Train Member

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    Recently blew my turbo.....I think it was just a fluke maybe. I started up a hill and it was pulling fine, went to pass another truck and heard a slight boom, It wasn't as big as I thought it'd be. From the time it blew to this time I turned it off(thankfully there was an exit ramp right there) was probably 30 seconds. There was 1 blume of smoke and no oil coming out of exhaust. There was a lot of smoke in my truck coming from the passenger side though.

    I use the term "blew" loosely as it didn't come apart and shatter into pieces. There was just oil near the rear clamp on the exhaust pipe coming out the back of the turbo.

    So what makes a turbo blow? This turbo was installed with 594k miles on it. I now have 1,037,000 miles.

    Weird thing is on Monday afternoon while driving, I got a code for the turbo boost sensor. And it did seem to boost/decrease boost/boost just at random times. I carry extra sensors in the truck so I changed it the next day. I didn't drive again until Thursday afternoon. It rode fine. Then Friday morning 2 hours after started driving it went haywire.

    I NEVER idle, I am heavy a lot of times. Heavy to me is grossing 70k+. Ive been over 105k a few times this year.... I know that low oil pressure can cause one to blow...what other things can cause this? Can a hole in the air to air cause it? Just normal turbo failure?... Ill post pictures in a few...
     
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  3. nikmirbre

    nikmirbre Road Train Member

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  4. Brandt

    Brandt Road Train Member

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    Not letting the turbo spool down I heard is always bad. Drivers pulling into fuel island and just shut truck off. That cut the engine oil off to the bearing, that puts a little extra wear on it everytime.
     
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  5. nikmirbre

    nikmirbre Road Train Member

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    Yea I’ve heard the same..... so if I’m coming off highway speeds, from the time I come off exit to the time I turn truck off I do a minimum of5 minutes....
     
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  6. Roberts450

    Roberts450 Road Train Member

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    VGT turbo's are just ticking time bombs waiting to go off. They have lots of moving parts in them in an environment that is not good to have moving parts in. Over time the parts wear out and don't function properly. Most likely what happened to yours was the VGT was getting slow/stuck and thats what caused the codes. When it blew the veins where probably closed some what and when you gave it more fuel to pass the other rig the veins didnt open fast enough which caused high drive pressure and over sped the turbo result in the failure. And with the higher speeds of these new turbo's spin the bearings also wear faster. Have you ever looked at the size difference in the turbo's from the older engines to the ones we have now days? They are like 1/2 the size they used to be. Smaller turbo means faster response so less smoke it also translates into higher shaft speeds to supply the air needed at higher engine RPM, so once again cleaner emissions standards is the main cause here.
     
  7. Rideandrepair

    Rideandrepair Road Train Member

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    Dirty air filters contribute, low idling and hot shut down is all I’ve ever heard of. Dirty oil of course. Sounds like your second one lasted the same as first. I had one blow @ around 350k once on a 12.7. Current 12.7 blew around 900 k then again around 1.6 mil now has around 2.1 mil. I’d like to change this one before it blows! Lol You just never know as they turn such high RPM s . Aside from checking if blades are rubbing it’s hard to predict
     
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  8. sbaumann14

    sbaumann14 Road Train Member

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    leaks causing over boost, bearing failure (they spin at 100k for how many years), oil feed, name your poison....what motor? got a BW 702 off ebay from authorized dealer for my DDEC 4 for under $600 sent to my door
     
  9. tommymonza

    tommymonza Road Train Member

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    I used to go through them like beers at a barbecue on my marine diesels

    My belief is the engine is being lugged and the turbo is being super heated.

    If you are winding out the motor the turbo and motor are exchanging a lot more air which is keeping the turbo cool .

    Shorts Lugs are fine. Long drawn out stretches are hard on motors and turbos.
     
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  10. Cam Roberts

    Cam Roberts Road Train Member

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    I agree. Long pulls I keep the rpm up. Keep air moving
     
  11. Okie dokey

    Okie dokey Bobtail Member

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    Only time Ive lost a turbo is when the boot got loose and sucked through it. Scared the #### out of me but I just called the plant they replaced my load of concrete. I idled back to the plant about 3 miles away dumped the load and went home. Truck was down the rest of the week I got a 4 day weekend I wasn't complaining lol.
     
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