Lexus IS250 · Service Manual ENGINE

ON-VEHICLE INSPECTION

Inspection


CHECK RADIATOR CAP SUB-ASSEMBLY

  1. A110260
    Measure the valve opening pressure.

    1. If there are water stains or foreign matter on rubber packing 1, 2 or 3, clean the part(s) with water and finger scouring.

    2. Check that 1, 2 or 3 is not deformed, cracked or swollen.

    3. Check that 3 and 4 are not stuck together.

    4. Apply engine coolant to 2 and 3 before using the radiator cap tester.

    5. A085446E08
      When using the cap tester, tilt it more than 30 degrees.

    6. Pump the cap tester several times, and check the maximum pressure*1.

      Pumping speed:
      1 pump per second

      HINT:
      *1: Even if the cap cannot maintain the maximum pressure, it is not a defect.

      Judgment criterion:
      Item
      		 Specified Condition
      Standard valve
      (for brand-new cap)
      		 93.3 to 122.7 kPa (0.95 to 1.25 kgf*cm2, 13.5 to 17.8 psi)
      Minimum standard valve
      (for used cap)
      		 78.5 kPa (0.8 kgf*cm2, 11.4 psi)

      If the maximum pressure is less than the minimum standard valve, replace the radiator cap sub-assembly.

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