Kia Cerato 2009 Service Manual page 58

(4) Check the valve length.
Length
Intake : 93.0mm (3.6614in)
Exhaust : 93.7mm (3.6890in)
(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.
Replace the seat if necessary.
(2) Before reconditioning the seat, check the valve guide for wear. If the valve guide is worn, replace it, then
recondition the seat.
(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 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.