Valve And Valve Spring

WARNING: This page is about a different car, the 2024 Kia Sorento. However, it is still accessible from the selected car via links, so may be relevant.

Inspect valve stems and valve guides.

Using a caliper gauge, measure the inside diameter of the valve guide.

Valve guide inner diameter (Intake/Exhaust):

5.505 - 5.517 mm (0.2167 - 0.2172 in.)

Courtesy of KIA MOTORS AMERICA, INC.

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)

Courtesy of KIA MOTORS AMERICA, INC.

Subtract the valve stem outer diameter measurement from the valve guide inner diameter measurement.
Valve stem-to-guide clearance:

Intake: 0.025 - 0.052 mm (0.0010 - 0.0020 in)

Exhaust: 0.035 - 0.059 mm (0.0014 - 0.0023 in)

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

Inspect the valves.

Check the angle of the valve face.
Check that the surface of valve for wear. If the valve face is worn, replace the valve.

Check the valve head margin thickness.

Valve head thickness (Margin)

Intake: 0.70 mm (0.0276 in.)

Exhaust: 0.91 mm (0.0358 in.)

Courtesy of KIA MOTORS AMERICA, INC.

Check the valve length.
Valve length

Intake: 112.84 mm (4.44252 in)

Exhaust: 122.83 mm (4.83582 in)

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.

Using a steel square, measure the out-of-square of valve spring.

Using a vernier calipers, measure the free length of valve spring.

Valve spring

Free height

Intake: 52.55 mm (2.0689 in.)

Exhaust: 50.00 mm (1.9685 in.)

Out of square: Less than 1.5°

Courtesy of KIA MOTORS AMERICA, INC.