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Home >> Porsche >> 2002 >> 911 Turbo, Automatic >> Repair and Diagnosis >> Engine Mechanical >> Exhaust >> Exhaust Gas Turbocharging - 911 Turbo (996) >> Checking and adjusting the bypass flap control boxes on the turbocharger >> Check and adjust (cylinder bank 1 - 3) >> Test

Check and adjust (cylinder bank 1 - 3): Test

  1. Raise the vehicle at the prescribed jacking points.
  2. Fasten special tool dial gauge holder VW 387 onto the underneath of the camshaft housing (cylinder bank 1-3). Flanges with thread M 8 have been provided or this procedure.
    Fig 1: Fastening Special Tool Dial Gauge Holder VW 387 Onto Underneath Of Camshaft Housing
    G03093518Courtesy of PORSCHE OF NORTH AMERICA, INC.
  3. Align tracer pin with push rod, set the dial gauge with pre-tension to 0.
  4. Connect special tool pressure gauge 9103/2. Connect hand pump and pressure gauge together with branch pieces. Hang pressure gauge on stabilizer.
  5. Remove vacuum hoses from the control box:
    • Push a small screwdriver between connection nipple and vacuum hose.
    • Widen vacuum hose a little and spray in silicone spray at the same time.
    • Pull off vacuum hose.
  6. Connect connecting piece (shop-made) and Tecalan line (shop-made) onto the control box and connect with the pressure gauge.
    Fig 2: Identifying Pressure Gauge And Vacuum Pump
    G03093519Courtesy of PORSCHE OF NORTH AMERICA, INC.
  7. Produce overpressure of 0.5 bar with special tool tester 9160/1. Read off pressure on special tool pressure gauge 9103/2. Have a second person read off the stroke of the push rod on the dial gauge at the same time.

    Prescribed stroke: 4 +/- 0.5 mm. 

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