Announcement

Collapse
No announcement yet.

Wastegate advice required on lower chamber leak

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • Wastegate advice required on lower chamber leak

    When checking the top chamber of the wastegate it holds the vacuum which to me indicates the diaphragm is ok.

    I then applied pressure to the lower chamber it raises the valve which is ok but its not holding the pressure, after 4 seconds the pressure has gone.

    Is this normal?

    Should the lower chamber be sealed so it does not leak?

    No matter if I apply a pressure or a vacuum to the lower chamber it leaks out ?

    With the top removed from the wastegate the center section appears to have about 1mm sideways movement.
    Last edited by orsum; 13th January 2018, 11:24.

  • #2
    It’s fairly normal, the valve guide has some play in it and it leaks down into the exhaust.
    When the motor is running there’s some pressure in the exhaust which opposes the pressure leaking out.
    Obviously a new wastegate leaks down less than an old one but I seem to remember your car doesn’t have massive mileage?

    S2 Coupe 3B Project


    Ur quattro restoration

    S2 Avant

    Boost is the new rock and roll!
    sigpic

    Comment


    • #3
      Put some soapy water round the banjo bolt, just to be sure it’s not leaking there.

      S2 Coupe 3B Project


      Ur quattro restoration

      S2 Avant

      Boost is the new rock and roll!
      sigpic

      Comment


      • #4
        Don't forget, the valve and guide will both expand when at operating temperatures; the clearance will be tighter. Better to apply pressure to the top chamber to test the integrity of the diaphragm.
        Panthero Coupé quattro 20vt
        Indigo ABY coupé
        Imola B6 S4 Avant

        Comment


        • #5
          no leak on joint or hose clamp

          Comment


          • #6
            If the top chamber is not leaking it will be fine.

            S2 Coupe 3B Project


            Ur quattro restoration

            S2 Avant

            Boost is the new rock and roll!
            sigpic

            Comment

            Working...
            X