how to find boost leak

Discussion in 'Volvo Forum' started by Terry270, May 6, 2015.

  1. Terry270

    Terry270 Road Train Member

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    First thought was the intercooler so I pressure tested it and it is good along with all the boots from turbo to intake manifold.

    Any ideas on how to diagnose this? Its only a minor leak right now, it comes and goes throughout the day. Sounds like a high pitch squealing when I pull a hill. I'm sure a smoke test wouldn't work in this case and there's no way building that much boost while sitting is possible. I am out of ideas



    Probably should add this is a 98 Volvo with 12.7 Detroit
     
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  3. marineman227

    marineman227 Dock Waterer

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    nevermind just re read your post if smoke test won't work my idea probably won't either
     
  4. Skate-Board

    Skate-Board Road Train Member

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    It's probably a small crack in the exhaust manifold right in the middle of the Y
     
  5. benrab

    benrab Medium Load Member

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    Sometimes a boost leak at the inlet of air compressor can generate noise like this .
    Ben
     
  6. mhyn

    mhyn Road Train Member

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    why you think you have boost leak ? the turbo is new ?
     
  7. Terry270

    Terry270 Road Train Member

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    OK I'll Check it closely for cracks thanks




    Near the inlet of air compressor? Can you explain? This problem is def related to turbo boost as I can only make it happen with a trailer behind it and getting into boost on a hill. And even then its sporadic
     
    Last edited: May 7, 2015
  8. Terry270

    Terry270 Road Train Member

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    Turbo is a somewhat newer BW 171702 and judging by the way the truck pulls hills I believe there's nothing wrong with it but who knows
     
  9. Starboyjim

    Starboyjim Road Train Member

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    Maybe one of the hoses in the boost path has a small crack or pinhole.
     
  10. Terry270

    Terry270 Road Train Member

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    Those got tested with the intercooler and are good.
     
  11. Skate-Board

    Skate-Board Road Train Member

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    This is what my crack looked like. (That didn't sound right)

    It made all different noises until I found it. A pinging noise, a knocking noise and a whistle



    [​IMG]
     
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