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Thread: 4.2 turbo leak

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    Expert dpetersen's Avatar
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    4.2 turbo leak

    Hey fellas,
    Just noticed a bit of an oil leak today when having a look under the bonnet.
    Looks like it must be coming from the turbo somewhere, any ideas?
    Cheers, gu iv 4.2tdi



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    Legendary Rossco's Avatar
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    Hey mate, she's a bit messy i reckon give it all a good clean then should be able to pin point where it's coming from when it rears it's head again. Bit hard to tell when it turns into a sludge fest. . .



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    dpetersen (8th May 2019)

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    As above give it a good clean, looks like it’s breathing heavy and leaking out of the join to the crossover pipe.

    Check for any cracks on that black hose, check the clamps are tight on that spot.

    I’m assuming your breather is recirculating back into the air intake?


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    dpetersen (8th May 2019)

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    Quote Originally Posted by AB View Post
    As above give it a good clean, looks like it’s breathing heavy and leaking out of the join to the crossover pipe.

    Check for any cracks on that black hose, check the clamps are tight on that spot.

    I’m assuming your breather is recirculating back into the air intake?


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    If your breather is still connected to the intake I would clean that area up, check for leaks, cracks, tighten as above and see if more oil comes out.

    If so I would be letting the breather breathe to the atmosphere for a couple of days to see if any more oil comes out of that spot just so you can eliminate a leaking turbo seal.

    Check for how heavy it’s breathing from that little hose too when you disconnect it.


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    dpetersen (8th May 2019)

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    Thanks for the feedback so far guys. Iv pulled the crank case breather hose out and there’s absolutely bugger all blow by.
    Iv gotta do a service on the weekend so I’ll give it a good degrease then and keep an eye on it.
    If I temporarily vent the crank case to the atmosphere what’s the best way to block the hole on the air intake?
    Also are there any seals inside the turbo that are common to leaking?
    Cheers


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    Plenty more to come!

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    Quote Originally Posted by dpetersen View Post
    Thanks for the feedback so far guys. Iv pulled the crank case breather hose out and there’s absolutely bugger all blow by.
    Iv gotta do a service on the weekend so I’ll give it a good degrease then and keep an eye on it.
    If I temporarily vent the crank case to the atmosphere what’s the best way to block the hole on the air intake?
    Also are there any seals inside the turbo that are common to leaking?
    Cheers


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    If you’re just doing the test then I wouldn’t stress too much about the way you block the intake just for a couple of days no off-roading, literally tape it off or something.

    As for turbo seal leak, absolutely!!!

    My work Ute Gq safari turbo seal is knackered and just today the seal is leaking worse and oil is everywhere!!!!


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    Probably not what you want to hear but also good news!

    If there’s no blow by then engine and other things good : tick!

    But possible turbo leak.

    Clean it all up, disconnect breather, etc and drive.

    You’ll still have oil in the compressor of turbo and that pipe so it will still leak a little bit for a few days, I would maybe drive it with no breather recycling for a week and keep cleaning to see if oil is building or getting less, if that makes sense.


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    dpetersen (8th May 2019)

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    Quote Originally Posted by AB View Post
    Probably not what you want to hear but also good news!

    If there’s no blow by then engine and other things good : tick!

    But possible turbo leak.

    Clean it all up, disconnect breather, etc and drive.

    You’ll still have oil in the compressor of turbo and that pipe so it will still leak a little bit for a few days, I would maybe drive it with no breather recycling for a week and keep cleaning to see if oil is building or getting less, if that makes sense.


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    Yeah that makes sense, I’ll give it a go over the weekend.
    Let’s say worst case, it’s a seal in the turbo, does that mean it’s a turbo out job to repair? And if so it going to be much more expensive to bang a new turbo in there? As much as I don’t want to spend the money it would be a good excuse to put in a bigger turbo haha


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    2006 4.2 tdi wagon
    TJM BullBar and bar work, Light bar & spotlights, Airtech snorkel, tradie rack, blocked egr, 2inch lift on 33s and a 3 inch exhaust to go with it all.
    Plenty more to come!

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    Administrator AB's Avatar
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    If it is a seal it would be perfect timing to upgrade the seal...lol

    It’s a turbo out job normally and sometimes not cheap.


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