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Hyundai Tucson: Cylinder Head

Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Workshop Manual / Engine Mechanical System / Cylinder Head Assembly / Cylinder Head

  1. Inspect for flatness.

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

Flatness of cylinder head gasket surface:

Flatness of cylinder head gasket surface:

Less than 0.05 mm (0.0020 in.) for total area

Less than 0.02 mm (0.0008 in.) for a section of 100 mm (3.9370 in.) X 100 mm (3.9370 in.)

Flatness of manifold mounting surface:

Flatness of manifold mounting surface: Less than 0.10 mm (0.0039 in.)

  1. 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 valve stems and valve guides.

(1) Using a caliper gauge, measure the inside diameter of the valve guide

Valve guide inner diameter (Intake / Exhaust) : 5.505 - 5.517 mm (0.2167 - 0.2172 in.)

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

(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

(3) 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.

  1. 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.

Valve head thickness (Margin)

Standard

Intake : 0.70 mm (0.0276 in.)

Exhaust : 0.91 mm (0.0358 in.)

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

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

(4) Check the length of valve.

Intake : 112.84 mm (4.4425 in.)

Exhaust : 122.83 mm (4.8358 in.)

  1. 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.

  1. 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

Free height

Intake : 52.55 mm (2.0689 in.)

Exhaust : 50.00 mm (1.9685 in.)

Out of square : Less than 1.5º

Reassembly

Reassembly

WARNING

  • Thoroughly clean all parts to be assembled.
  • Before installing the parts, apply fresh engine oil to all sliding and rotating surface.
  • Always use new valve stem seals.
  1. Install the valves.

(1) After applying engine oil to the valve stem seal, install a new valve stem seal using the special tool (09222- 2B100).

WARNING

  • Do not reuse old valve stem oil seals.
  • Incorrect installation of the seal could result in oil leakage past the valve guides.
  • Do not reassembly ones in the other's places.

WARNING

Intake valve stem seals are different from exhaust ones in type.

(2) Install the spring seats.

(3) Apply engine oil to the entire outer surface of each valve stem and insert the valve inside the valve guide.

(4) Install the valve spring.

(5) Install the retainer.

(6) Using the SST (09222-3K000, 09222-3K100), compress the valve spring and install the valve spring retainer lock.

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