RADIATOR ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

CAUTION:

Do not remove the radiator reservoir cap sub-assembly while the engine and radiator assembly are still hot. Pressurized, hot engine coolant and steam may be released and cause serious burns.

B0025A2

PROCEDURE


  1. CHECK RADIATOR RESERVOIR CAP SUB-ASSEMBLY

    CAUTION:

    Do not remove the radiator reservoir cap sub-assembly while the engine and radiator assembly are still hot. Pressurized, hot engine coolant and steam may be released and cause serious burns.


    1. B00259FC01
      *a O-Ring
      *b Rubber Packing

      Measure the valve opening pressure.


      1. If there are water stains or foreign matter on the O-ring, clean it with water and finger scouring.

      2. Check that the O-ring is not deformed, cracked or swollen.

      3. Apply engine coolant to the O-ring and rubber packing before using a radiator cap tester.

      4. B002576C19
        *1 Radiator Reservoir Cap Sub-Assembly
        *a Radiator Cap Tester
        *b 30° or more

        When using the radiator cap tester, tilt it 30° or more.

      5. Pump the radiator cap tester several times, and check the maximum pressure*.

        Pump speed
        1 pump per second

        *: Even if the radiator reservoir cap sub-assembly cannot maintain the maximum pressure, it is not a defect.

        Judgment Criterion
        Item Specified Condition

        Standard value

        (for brand-new cap)

        93 to 123 kPa (1.0 to 1.3 kgf/cm2, 13.5 to 18 psi)

        Minimum standard value

        (after using cap)

        79 kPa (0.8 kgf/cm2, 11.4 psi)

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

  2. INSPECT FINS FOR BLOCKAGE

    B0024PL

    1. If the fins are clogged, wash them with water or a steam cleaner and dry them with compressed air.

      Note


      • To avoid damaging the fins, the injection direction should be at right angles to the core surface.

      • If the steam cleaner is too close to the core, there is a possibility of damaging the fins, so maintain the following injection distances.

        Standard Injection Distance
        Injection Pressure Specified Condition

        2942 to 4903 kPa

        (30.0 to 50.0 kgf/cm2, 427 to 711 psi)

        		 300 mm (11.8 in.)

        4903 to 7845 kPa

        (50.0 to 80.0 kgf/cm2, 711 to 1138 psi)

        		 500 mm (19.7 in.)

      • If the fins are bent, straighten them with a screwdriver or pliers.

      • Do not expose electronic components to water.

    2. Dry the fins with compressed air.