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Non-return Valve A/B Inspection/Replacement: Inspection

  1. Remove the non-return valve.
  2. Connect the vacuum pump/gauge, 0-30 in.Hg, to the non-return valve as shown. Note the direction of the arrow on the valve.
    Fig 1: Connecting Vacuum Pump/Gauge To Non-Return Valve
    G05444900Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Apply vacuum to the valve.
    • If it holds vacuum, go to step  4.
    • If it doesn't hold the vacuum, replace the non return valve.
  4. Connect the vacuum pump/gauge, 0-30 in.Hg, to the non-return valve as shown. Note the direction of the arrow on the valve.
    Fig 2: Connecting Vacuum Pump/Gauge To Non-Return Valve
    G05444901Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. Apply vacuum to the valve.
    • If it holds vacuum, replace the non-return valve.
    • If it doesn't hold the vacuum, the non-return valve is OK.
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