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Home >> Genesis >> 2021 >> G90 5.0 Ultimate, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Cylinder Head Assembly - 3.3L) >> 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 I.D. 

      Intake/Exhaust: 5.500 - 5.512 mm (0.216 - 0.217 in.)

      G14207421Courtesy of HYUNDAI MOTOR AMERICA
    2. Using a micrometer, measure the diameter of the valve stem.

      Valve stem O.D. 

      Intake: 5.465 - 5.480 mm (0.2151 - 0.2157 in.)

      Exhaust: 5.458 - 5.470 mm (0.2149 - 0.2153 in.)

      G14207422Courtesy of HYUNDAI MOTOR AMERICA
    3. To measure the valve stem-to-guide clearance, subtract the valve guide inside diameter from the valve stem diameter.

      Valve stem-to-guide clearance 

      [Standard]

      Intake: 0.020 - 0.047 mm (0.0008 - 0.0018 in.)

      Exhaust: 0.030 - 0.054 mm (0.0012 - 0.0021 in.)

      [Limit]

      Intake: 0.07 mm (0.0027 in.)

      Exhaust: 0.09 mm (0.0035 in.)

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

      If the wear is excessive, replace the valve.

    3. Check the valve head margin thickness.

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

      Margin 

      [Standard]

      Intake: 1.0 mm (0.0394 in)

      Exhaust: 1.1 mm (0.0433 in)

      G14207423Courtesy of HYUNDAI MOTOR AMERICA
    4. Check the valve length.

      Length 

      Intake: 105.27 mm (4.1445 in)

      Exhaust: 105.30 mm (4.1457 in)

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

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

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

      If the valve seat is worn, replace cylinder head.

    2. Before reconditioning the seat, check the valve guide for wear. If the valve guide is worn, replace the cylinder head.
    3. Recondition the valve seat with a valve seat grinder or cutter.

      The valve seat contact width should be within specifications and centered on the valve face.

  4. Inspect valve springs.
    1. Using a steel square, measure the out-of-square of the valve spring.
    2. Using vernier calipers, measure the free length of the valve spring.

      Valve spring 

      [Standard]

      Free height: 46.2 mm (1.8189 in.)

      Out-of-square: MAX, 1.5°

      G14207424Courtesy of HYUNDAI MOTOR AMERICA
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