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Servo Diaphragm

  1. Visually inspect all vacuum hoses for damage and proper routing. Disconnect vacuum control valve-to-intake manifold vacuum line at "T" fitting near air injection system control valve.
  2. Disconnect air control valve vacuum line and connect it to "T" fitting so intake manifold vacuum can be applied directly to servo diaphragm. Disconnect vacuum hose from distributor and connect tachometer to engine.
  3. Start engine. Engine speed should raise to 1400-1500 RPM. If not, adjust speed by turning adjusting screw on servo diaphragm throttle lever until specified RPM is obtained. Reconnect vacuum hoses to original positions.
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