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Vacuum Advance

  1. Disconnect and plug vacuum hoses at distributor. Connect timing light and start engine. Make sure idle speed is correct. Connect vacuum pump to advance side of diaphragm (lower fitting) and apply vacuum.
  2. Disconnect vacuum pump from diaphragm. Apply vacuum to upper fitting.
  3. Apply 4" Hg of vacuum and gradually increase vacuum in increments of 4" Hg. To check maximum advance, apply 20" Hg. Ensure that vacuum advance values agree with specification.
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