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Turbo noise

Discussion in 'Volvo Forum' started by v6killer, Feb 9, 2012.

  1. Feb 9, 2012 #1
    v6killer

    v6killer Medium Load Member

    448
    122
    Dec 6, 2010
    ChicagoLand
    0
    I have an 2007 780 with an D12, with auto shift, ( 567,678 miles )I was just wounding is there an blow valve on the turbo or on the upper / lower intercooler #pipes, I was getting a whoosh sound at medium and high boost (sound like a fan belt slipping on a alternator pulley )I thought I was losing some boost pressor through some blowoff valve or maybe I have a crack in the upper and lower intercooler pipes or fittings.

    I do here that sound in question when I let off the fuel pedal in high boost, which I know is normal.
    Should I be concerned about this noise or do I have a turbo problem or something else, any help on this matter would be great.
     
    v6killer, Feb 9, 2012
    v6killer, Feb 9, 2012
    #1
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  3. Feb 9, 2012 #2
    truckmechanic

    truckmechanic Medium Load Member

    534
    140
    Jan 14, 2012
    Hi Desert Ca
    0
    Check the exhaust manifold and turbo mounting flange gaske ts they can be e
    xtremely load when bad especially with a vgt turbo also check all your cac boots for holes tears and loose clamps a lot of times you can see a little streak of black of dust where the boots are leaking
     
    truckmechanic, Feb 9, 2012
    truckmechanic, Feb 9, 2012
    #2
  4. Feb 10, 2012 #3
    shtocarul

    shtocarul Bobtail Member

    6
    1
    Jul 3, 2011
    new castle,indiana
    0
    on my truck was turbo gasket i put a new one but after 3 monts i got back the same noise and leave it like that
     
    shtocarul, Feb 10, 2012
    shtocarul, Feb 10, 2012
    #3
  5. Feb 10, 2012 #4
    v6killer

    v6killer Medium Load Member

    448
    122
    Dec 6, 2010
    ChicagoLand
    0
    I was going to spray some starting fluid on the upper and lower intercooler pipes and hoses, also in front of the intercooler itself and see if the engine would raised the RPM, I was just wondering if this would work instead of chasing down every holes clamp.

    Also dose this engine have any blow off valve for the turbo?
     
    v6killer, Feb 10, 2012
    v6killer, Feb 10, 2012
    #4
  7. Feb 10, 2012 #5
    Kansas

    Kansas Road Train Member

    2,541
    2,585
    Apr 14, 2009
    aircap, Ks.
    0
    You can make yourself a product similar to this. An PVC pipe endcap works in lieu of the aluminum slug.

    http://www.dieselsite.com/dieselsiteturboboostleakdetector-4.aspx

    Pressure up the system with 8 or 10lbs of air pressure. Then spray everything down with soapy water. It will show you every little air leak in the system. Resist using more air pressure than that. Bad crap can happen lol :biggrin_25521:
     
    Kansas, Feb 10, 2012
    Kansas, Feb 10, 2012
    #5
  8. Feb 10, 2012 #6
    truckmechanic

    truckmechanic Medium Load Member

    534
    140
    Jan 14, 2012
    Hi Desert Ca
    0
    Never tried finding leaks that way it might work but I Dought it you if you can't pressue check it u might have some power brake it to build up boost to get an idea of where its coming from
     
    truckmechanic, Feb 10, 2012
    truckmechanic, Feb 10, 2012
    #6
  9. Feb 25, 2012 #7
    v6killer

    v6killer Medium Load Member

    448
    122
    Dec 6, 2010
    ChicagoLand
    0
    Well it turns out to be the power steering pump is making all the noise, when the turbo gets into high boots levels.

    I was just wondering if any one else had this problem.....
     
    v6killer, Feb 25, 2012
    v6killer, Feb 25, 2012
    #7
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