Kia Soul: Cylinder Head Inspection - Cylinder Head Assembly - Engine Mechanical System - Kia Soul 2014-2018 PS Service ManualKia Soul: Cylinder Head Inspection

Second generation PS (2014-2018) / Kia Soul 2014-2018 PS Service Manual / Engine Mechanical System / Cylinder Head Assembly / Cylinder Head Inspection

Cylinder Head
1.
Inspect for flatness.
Using a precision straight edge and filler gauge, measure the surface the contacting the cylinder block and the manifolds for warpage.

Flatness of cylinder head gasket surface
Standard :
Less than 0.05mm (0.0020in) for total area
Less than 0.02mm (0.0008in) for a section of 100mm (3.9370in) X 100mm (3.9370in)

2.
Inspect for cracks.
Check the combustion chamber, intake ports, exhaust ports and cylinder block surface for cracks. If cracked, replace the cylinder head.
Valve And Valve Spring
1.
Inspect the valve stems and valve guides.
(1)
Using a caliper gauge, measure the inner diameter of valve guide.

Valve guide inner diameter :
5.500 ~ 5.512mm (0.2165 ~ 0.2170in)

(2)
Using a micrometer, measure the outer diameter of valve stem.

Valve stem outer diameter
Intake : 5.465 ~ 5.480mm (0.2152 ~ 0.2157in)
Exhaust : 5.458 ~ 5.470mm (0.2149 ~ 0.2154in)

(3)
Subtract the valve stem outer diameter measurement from the valve guide inner diameter measurement.

Valve stem- to-guide clearance
Intake : 0.020 ~ 0.047mm (0.0008 ~ 0.0019in)
Exhaust : 0.030 ~ 0.054mm (0.0012 ~ 0.0021in)

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 : 1.10mm (0.0433in)
Exhaust : 1.26mm (0.0496in)

(4)
Check the length of valve.

Valve length
Standard
Intake : 93.15mm (3.6673 in)
Exhaust : 92.60mm (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 : 45.1mm (1.7756in)
Out of square : Less than 1.5∞

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