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Home >> Kia >> 2020 >> Soul GT Line Turbo >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Cylinder Head Assembly - 1.6L >> Cylinder Head >> Repair Procedures >> Inspection >> Valve And Valve Spring

Valve And Valve Spring

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

      For valve guide inner diameter, evenly measure 5 points 2 mm (0.0787 in) from each end of valve guide.

      Valve guide inner diameter: 

      5.500 - 5.512 mm (0.2165 - 0.2170 in)

      G13280476Courtesy of KIA MOTORS AMERICA, INC.
    2. Using a micrometer, measure the outer diameter of valve stem.

      Valve stem outer diameter 

      Intake: 5.465 - 5.480 mm (0.2152 - 0.2157 in)

      Exhaust: 5.458 - 5.470 mm (0.2149 - 0.2154 in)

      G13280477Courtesy of KIA MOTORS AMERICA, INC.
    3. Subtract the valve stem outer diameter measurement from the valve guide inner diameter measurement.

      Valve stem - to - guide clearance 

      Intake: 0.020 - 0.047 mm (0.0008 - 0.0019 in)

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

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

  2. Inspect the valves.
    1. Check the valve is ground to the correct valve face angle.
    2. Check that the surface of 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 minimum, replace the valve.

      Margin 

      Standard

      Intake: 1.10 mm (0.0433 in)

      Exhaust: 1.26 mm (0.0496 in)

      G13280478Courtesy of KIA MOTORS AMERICA, INC.
    4. Check the length of valve.

      Valve length 

      Standard

      Intake: 93.15 mm (3.6673 in)

      Exhaust: 92.60 mm (3.6457 in)

    5. Check the surface of valve stem tip for wear. If the valve stem tip is worn, replace the valve.
  3. Inspect the 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 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.

      Valve spring 

      Standard

      Free height: 45.1 mm (1.7756 in)

      Out of square: Less than 1.5°

      G13280479Courtesy of KIA MOTORS AMERICA, INC.
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