Kia Sorento: Cylinder Head Inspection
Cylinder Head
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1. |
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.)
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2. |
Inspect for cracks.
Check the combustion chamber, intake ports, exhaust ports and cylinder
block surface for cracks. If cracked, replace the cylinder head.
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Valve And Valve Spring
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1. |
Inspect valve stems and valve guides.
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(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.)
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(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.)
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(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.)
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If the clearance is greater than maximum, replace the valve
or cylinder head.
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2. |
Inspect the valves.
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(1) |
Check the valve is ground to the correct valve face angle.
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(2) |
Check that the surface of the valve for wear.
If the valve face is worn, replace the valve.
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(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.)
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If the margin thickness is less than minimum, replace the valve.
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(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.)
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(5) |
Check the surface of the valve stem tip for wear.
If the valve stem tip is worn, replace the valve.
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3. |
Inspect the valve seats
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(1) |
Check the valve seat for evidence of overheating and improper
contact with the valve face. Replace the cylinder head if necessary.
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(2) |
Check the valve guide for wear. If the valve guide is worn,
replace the cylinder head.
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4. |
Inspect the valve springs.
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(1) |
Using a steel square, measure the out-of-square of the valve
spring.
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(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°
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If the free length is not as specified, replace the valve spring.
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MLA (Mechanical Lash Adjuster)
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1. |
Inspect the MLA.
Using a micrometer, measure the MLA outside diameter.
MLA outer diameter :
31.964 ~ 31.980 mm (1.2584 ~ 1.2590 in.)
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2. |
Using a caliper gauge, measure MLA tappet bore inner diameter of cylinder
head.
Tappet bore inner diameter :
32.000 ~ 32.025 mm (1.2598 ~ 1.2608 in.)
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3. |
Subtract MLA outside diameter measurement from tappet bore inside diameter
measurement.
MLA to tappet bore clearance
[Standard] : 0.020 ~ 0.061 mm (0.00078 ~ 0.00240 in.)
[Limit] : 0.070 mm (0.00275 in.)
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Identify MLA(Mechanical Lash Adjuster), valves, valve springs as they
are removed so that each item can be reinstalled i ...
Thoroughly clean all parts to be assembled.
Before installing the parts, apply fresh engine oil to all sliding and
...
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Cylinder Head Disassembly
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