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Vacuum Modulator: Checking: Adjusting

  1. Disconnect vacuum hose from vacuum modulator. Remove vacuum modulator retaining bolt and bracket. See Fig 2.
  2. Turn vacuum modulator housing clockwise to increase pressure, and counterclockwise to decrease pressure. Turning modulator 2 notches will vary pressure approximately 1.5 psi (.105 kg/cm2 ).
    Fig 1: Pressure Port For Oil Pressure Gauge
    G100015Courtesy of CHRYSLER MOTORS.
    Fig 2: Adjusting Vacuum Modulator & Oil Pressure
    G100016Courtesy of CHRYSLER MOTORS.
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