Kia Sorento: Cylinder Head Inspection

Kia Sorento (XM, 2011-2015) Service Manual / Engine Mechanical System / Cylinder Head Assembly / Cylinder Head Inspection

Cylinder Head

Inspect for flatness.

Using a precision straight edge and feeler gauge, measure the surface the contacting the cylinder block and the manifolds for warpage.

Flatness of cylinder head gasket surface

Standard : Less than 0.05 mm (0.0019 in.) for total area

Less than 0.02 mm (0.0007 in.) for a section of 100 mm (3.9370 in.) X 100 mm (3.9370 in.)

Flatness of manifold mounting surface (Intake/Exhaust)

Standard : Less than 0.10 mm (0.0039 in.)

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

Inspect valve stems and valve guides.

(1)

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

Valve guide inner diameter

Intake / Exhaust :

5.500 ~ 5.512 mm (0.21654 ~ 0.21701 in.)

(2)

Using a micrometer, measure the diameter of the valve stem.

Valve stem outer diameter

Intake : 5.465 ~ 5.480 mm (0.21516 ~ 0.21575 in.)

Exhaust : 5.458 ~ 5.470 mm (0.214988 ~ 0.21535 in.)

(3)

Subtract the valve stem diameter measurement from the valve guide inside diameter measurement.

Valve stem-to-guide clearance

[Standard]

Intake : 0.020 ~ 0.047 mm (0.00078 ~ 0.00185 in.)

Exhaust : 0.030 ~ 0.054 mm (0.00118 ~ 0.00212 in.)

[Limit]

Intake : 0.070 mm (0.00275 in.)

Exhaust : 0.090 mm (0.00354 in.)

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

Inspect the valves.

(1)	Check the valve is ground to the correct valve face angle.

(2)	Check that the surface of the valve for wear. If the valve face is worn, replace the valve.

(3)

Check the valve head margin thickness.

Valve head thickness (Margin)

[Standard]

Intake : 1.02 mm(0.0401 in.)

Exhaust : 1.09 mm(0.0429 in.)

If the margin thickness is less than minimum, replace the valve.

(4)

Check the valve length.

Valve length

[Standard]

Intake : 113.18 mm (4.4559 in.)

Exhaust : 105.84 mm (4.1669 in.)

[Limit]

Intake : 112.93 mm (4.4461 in.)

Exhaust : 105.59 mm (4.1571 in.)

(5)	Check the surface of the 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. Replace the cylinder head if necessary.

(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 the valve spring.

(2)

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

Valve spring

[Standard]

Free height : 47.44 mm (1.8677 in.)

Out-of-square : Less than 1.5

Cylinder Head Disassembly

Identify MLA(Mechanical Lash Adjuster), valves, valve springs as they are removed so that each item can be reinstalled in its original position. ...

Cylinder Head Reassembly

Thoroughly clean all parts to be assembled. Before installing the parts, apply fresh engine oil to all sliding and rotating surfaces. ...

Kia Sorento: Cylinder Head Inspection

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