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Home >> Saab >> 2001 >> 9-3 Base, 2D Hatchback, Automatic >> Repair and Diagnosis >> Engine Mechanical >> Blowers, Superchargers & Turbochargers >> Turbocharger System, Petrol >> Adjustment Replacement >> Checking and adjusting basic charging pressure (B235R, B205L/R)

Checking and adjusting basic charging pressure (B235R, B205L/R)

  1. Remove the bypass pipe with valve.
    Fig 1: Illustration For Steps 1-2-3
    G03504454Courtesy of SAAB-SCANIA OF AMERICA, INC.
    NOTE: There is an O-ring where the bypass pipe is fastened to the turbocharger inlet pipe.
  2. Remove the exhaust manifold heat shield. The heat shield is attached with a nut and two clips on the underside.
  3. Remove the control arm circlip using 83 94 538 Circlip tool.
  4. Grip the push rod using 83 94 066 Pliers or the like. Undo the lock nut using 83 94 520 Wrench, lock nut or the like.
    Fig 2: Illustration For Steps 4-5-6-7-8
    G03504455Courtesy of SAAB-SCANIA OF AMERICA, INC.
  5. Hold the control arm and detach the push rod. Secure the arm. Otherwise, the control arm may "jump over".
  6. Move the control arm on the boost pressure control valve to the "Closed" position and adjust the end piece so that the push rod can easily be fitted on the control arm pin.
  7. Detach the push rod from the control arm pin. Turn the end piece clockwise about 2 turns so that a prestress of 2 mm is obtained. Attach the push rod to the control arm pin. Fit the circlip.
  8. Detach the hose from the diaphragm box.
  9. Connect 30 14 883 Pressure/vacuum pump to the diaphragm box as well as pressure gauge 83 93 514 Boost pressure gauge.
    Fig 3: Illustration For Steps 9-10-11
    G03504456Courtesy of SAAB-SCANIA OF AMERICA, INC.
  10. Carefully pump up pressure until the control rod moves to regulate the boost pressure.
  11. Just as the control rod starts to move, read off the pressure on the pressure gauge. It should be 0.45 bar (+/-0.03 bar).
  12. Shorten the rod if the pressure is too low until 0.45 bar is obtained.
  13. Undo the push rod and apply Molykote 1000, part no. 30 20 971, or equivalent to the pin on the control arm.
    Fig 4: Illustration For Steps 13-14-15-16
    G03504457Courtesy of SAAB-SCANIA OF AMERICA, INC.
  14. Fit the push rod and clip, grip the push rod with a pair of adjustable pliers and lock the nut.
  15. Remove the pressure gauge and pump.
  16. Reconnect the hose to the diaphragm box.
  17. Fit the heat shield.
    Fig 5: Illustration For Steps 17-18
    G03504458Courtesy of SAAB-SCANIA OF AMERICA, INC.
  18. Lubricate the O-ring with acid-free vaseline and fit the bypass pipe.

    Tightening torque: 8 N.m (6 lbf ft) 

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