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Home >> Hyundai >> 2018 >> Tucson Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Cylinder Head Assembly - 2.0L) >> Cylinder Head >> Repair Procedures >> Inspection >> Valve and Valve Spring

Valve and Valve Spring

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  1. Inspect valve stems and valve guides.
    1. Using a caliper gauge, measure the inside diameter of the valve guide.

      Valve guide inner diameter  Intake: 5.500 ~ 5.512 mm (0.21654 ~ 0.21701 in.)

      Exhaust: 5.500 ~ 5.512 mm (0.21654 ~ 0.21701 in.)

      G12610512Courtesy of HYUNDAI MOTOR AMERICA
    2. Using a micrometer, measure the diameter of the valve stem.

      Valve stem outer diameter  Intake: 5.465 ~ 5.480 mm (0.21516 ~ 0.21575 in.)

      Exhaust: 5.458 ~ 5.470 mm (0.21488 ~ 0.21535 in.)

      G12610513Courtesy of HYUNDAI MOTOR AMERICA
    3. Subtract the valve stem diameter measurement from the valve guide inside diameter measurement.

      If the clearance is greater than specification, replace the valve or the cylinder head.

      Valve stem-to-guide clearance  [Standard]

      Intake: 0.020 ~ 0.047 mm (0.00079 ~ 0.00185 in.)

      Exhaust: 0.030 ~ 0.054 mm (0.00118 ~ 0.00213 in.)

  2. Inspect the valves.
    1. Check the valve is ground to the correct valve face angle.
    2. Check that the surface of the valve for wear.

      If the valve face is worn, replace the valve.

    3. Check the valve head margin thickness.

      If the margin thickness is less than specification, replace the valve.

      Margin  [Standard]

      Intake: 1.30 mm (0.0512 in.)

      Exhaust: 1.26 mm (0.0496 in.)

      G12610514Courtesy of HYUNDAI MOTOR AMERICA
    4. Check the valve length.

      Valve length  [Standard]

      Intake: 102.22 mm (4.0244 in.)

      Exhaust: 104.04 mm (4.0961 in.)

      [Limit]

      Intake: 101.97 mm (4.0146 in.)

      Exhaust: 103.79 mm (4.0862 in.)

    5. Check the surface of the valve stem tip for wear.

      If the valve stem tip is worn, replace the valve.

  3. Inspect the valve seats and the valve guides.
    1. Check the valve seat for evidence of overheating and improper contact with the valve face.

      If the valve seat is worn, replace the cylinder head.

    2. Check the valve guide for wear. If the valve guide is worn, replace the cylinder head.
  4. Inspect the valve springs.
    1. Using a steel square, measure the out-of-square of valve spring.
    2. Using a vernier calipers, measure the free length of valve spring.

      If the free length is not as specified, replace the valve spring.

      Valve spring  [Standard]

      Free height: 45.93 mm (1.8083 in.)

      Out-of-square: Less than 1.5°

      G12610515Courtesy of HYUNDAI MOTOR AMERICA
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