Valve And Valve Spring

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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)
  
  Fig 1: Measuring Inner Diameter Of Valve Guide Using Caliper Gauge
  Courtesy 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)
  
  Fig 2: Measuring Outer Diameter Of Valve Stem Using Micrometer
  Courtesy 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.
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)
  
  Fig 3: Checking Valve Head Margin Thickness
  Courtesy 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.
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.
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°
  
  Fig 4: Measuring Free Length Of Valve Spring Using Vernier Calipers
  Courtesy of KIA MOTORS AMERICA, INC.