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CYLINDER HEAD INSPECTION

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PROCEDURE


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    CLEAN CYLINDER HEAD SUB-ASSEMBLY


    1. Using a gasket scraper, remove all the gasket material from the surface of the cylinder head sub-assembly that contacts the cylinder block sub-assembly.

      Note:

      Be careful not to scratch the surface of the cylinder head sub-assembly.

    2. Using a soft brush and solvent, thoroughly clean the cylinder head sub-assembly.

    3. A01SDPA

      Using a valve guide bushing brush and solvent, clean all the valve guide bushes.

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    INSPECT CYLINDER HEAD SUB-ASSEMBLY


    1. A01SC71C01
      *a Cylinder Block Sub-assembly Side
      *b Intake Manifold Side
      *c Exhaust Manifold Side

      Inspect the cylinder head sub-assembly for warpage.


      1. Using a precision straightedge and feeler gauge, measure the surfaces of the cylinder head sub-assembly that contact the cylinder block sub-assembly and manifolds for warpage.

        Maximum warpage
        0.15 mm (0.00591 in.)

        If the warpage is more than the maximum, replace the cylinder head sub-assembly.

    2. Inspect the cylinder head sub-assembly for cracks.


      1. Using a dye penetrant, check the combustion chamber, intake ports, exhaust ports and cylinder block sub-assembly surface for cracks.

        If there are cracks, replace the cylinder head sub-assembly.

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    CLEAN INTAKE VALVE


    1. Using a gasket scraper, chip off any carbon from the intake valve head.

    2. Using a wire brush, thoroughly clean the intake valve.

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    INSPECT INTAKE VALVE


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

      Standard valve stem diameter
      5.970 to 5.985 mm (0.235 to 0.236 in.)

      If the diameter is not as specified, replace the intake valve.

    2. A01SESBC06
      *a Valve Face Angle

      Check the valve face angle.


      1. Grind the valve enough to remove any pits and carbon.

      2. Check that the valve is ground to the correct valve face angle.

        Standard valve face angle
        44.5°

        If the result is not as specified, replace the intake valve.

    3. A01SCJPC05
      *a Margin Thickness

      Check the valve head margin thickness.

      Standard margin thickness
      1.1 mm (0.0433 in.)
      Minimum margin thickness
      0.6 mm (0.0236 in.)

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

    4. Check the overall valve length.

      Standard overall length
      105.38 to 105.78 mm (4.15 to 4.16 in.)
      Minimum overall length
      104.88 mm (4.13 in.)

      If the overall length is less than the minimum, replace the intake valve.

    5. A01SAN5

      Check the surface of the valve stem tip for wear.

      If the valve stem tip is worn, resurface the tip with a grinder or replace the intake valve.

      Note:

      Do not grind the valve so it becomes shorter than the minimum overall length.

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    CLEAN EXHAUST VALVE


    1. Using a gasket scraper, chip off any carbon from the exhaust valve head.

    2. Using a wire brush, thoroughly clean the exhaust valve.

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    INSPECT EXHAUST VALVE


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

      Standard valve stem diameter
      5.960 to 5.975 mm (0.2346 to 0.2352 in.)

      If the diameter is not as specified, replace the exhaust valve.

    2. A01SESBC07
      *a Valve Face Angle

      Check the valve face angle.


      1. Grind the valve enough to remove any pits and carbon.

      2. Check that the valve is ground to the correct valve face angle.

        Standard valve face angle
        44.5°

        If the result is not as specified, replace the exhaust valve.

    3. A01SCJPC06
      *a Margin Thickness

      Check the valve head margin thickness.

      Standard margin thickness
      1.1 mm (0.0433 in.)
      Minimum margin thickness
      0.6 mm (0.0236 in.)

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

    4. Check the overall valve length.

      Standard overall length
      105.57 to 105.97 mm (4.16 to 4.17 in.)
      Minimum overall length
      105.07 mm (4.14 in.)

      If the overall length is less than the minimum, replace the exhaust valve.

    5. A01SAN5

      Check the surface of the valve stem tip for wear.

      If the valve stem tip is worn, resurface the tip with a grinder or replace the exhaust valve.

      Note:

      Do not grind the valve so it becomes shorter than the minimum overall length.

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    INSPECT INNER COMPRESSION SPRING


    1. A01SEWNC04
      *a Deviation

      Using a steel square, measure the deviation of the inner compression spring.

      Maximum deviation
      2.0 mm (0.0787 in.)

      If the deviation is more than the maximum, replace the inner compression spring.

    2. A01L8B6

      Using a vernier caliper, measure the free length of the inner compression spring.

      Standard free length
      46.5 mm (1.83 in.)

      If the free length is not as specified, replace the inner compression spring.

    3. A01SCVA

      Using a spring tester, measure the tension of the inner compression spring at the specified installed length.

      Standard tension (at 33.1 mm (1.30 in.))
      150 to 165 N (15 to 17 kgf, 33.7 to 37.0 lbf)

      If the tension is not as specified, replace the inner compression spring.

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    INSPECT INTAKE VALVE GUIDE BUSH


    1. A01SDM4

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

      Standard valve guide bush inside diameter
      6.01 to 6.03 mm (0.2366 to 0.2374 in.)

    2. Subtract the valve stem diameter measurement (refer to the intake valve inspection procedures above) from the intake valve guide bush inside diameter measurement.

      Standard oil clearance
      0.025 to 0.060 mm (0.000984 to 0.00236 in.)
      Maximum oil clearance
      0.08 mm (0.00315 in.)

      If the oil clearance is more than the maximum, replace the intake valve and intake valve guide bush.

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    INSPECT EXHAUST VALVE GUIDE BUSH


    1. A01SAJ1

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

      Standard valve guide bush inside diameter
      6.01 to 6.03 mm (0.2366 to 0.2374 in.)

    2. Subtract the valve stem diameter measurement (refer to the exhaust valve inspection procedures above) from the exhaust valve guide bush inside diameter measurement.

      Standard oil clearance
      0.035 to 0.070 mm (0.00138 to 0.00276 in.)
      Maximum oil clearance
      0.10 mm (0.00394 in.)

      If the oil clearance is more than the maximum, replace the exhaust valve and guide bush.

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    INSPECT INTAKE VALVE SEAT


    1. A01SBQEC06
      *a 45° Carbide Cutter

      Using a 45° carbide cutter, resurface the valve seats. Remove only enough metal to clean the valve seats.

    2. A01SCBXC08
      *a Width

      Apply a light coat of Prussian blue to the valve face.

    3. Lightly press the valve face against the valve seat.

      Note:

      Do not rotate the valve while pressing the valve against the valve seat.

    4. Check the valve face and valve seat.


      1. Check that the contact surfaces of the valve seat and valve face are in the middle area of their respective surfaces, with the width between 1.2 and 1.6 mm (0.0472 and 0.0630 in.).

        If the contact surfaces are not as specified, resurface the intake valve seat. If necessary, replace the intake valve.

      2. Check that the contact surfaces of the valve seat and valve face are even around the entire valve seat.

        If the contact surfaces are not as specified, resurface the intake valve seat. If necessary, replace the intake valve.

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    INSPECT EXHAUST VALVE SEAT


    1. A01SCKOC06
      *a 45° Carbide Cutter

      Using a 45° carbide cutter, resurface the valve seats. Remove only enough metal to clean the valve seats.

    2. A01SCBXC09
      *a Width

      Apply a light coat of Prussian blue to the valve face.

    3. Lightly press the valve face against the valve seat.

      Note:

      Do not rotate the valve while pressing the valve against the valve seat.

    4. Check the valve face and valve seat.


      1. Check that the contact surfaces of the valve seat and valve face are in the middle area of their respective surfaces, with the width between 1.6 and 2.0 mm (0.0630 and 0.0787 in.)

        If the contact surfaces are not as specified, resurface the exhaust valve seat. If necessary, replace the exhaust valve.

      2. Check that the contact surfaces of the valve seat and valve face are even around the entire valve seat.

        If the contact surfaces are not as specified, resurface the exhaust valve seat. If necessary, replace the exhaust valve.

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    INSPECT VALVE LIFTER


    1. A01LDHE

      Using a micrometer, measure the valve lifter diameter.

      Standard lifter diameter
      30.966 to 30.976 mm (1.219 to 1.220 in.)
    2. A01LANV

      Using a caliper gauge, measure the valve lifter bore diameter of the cylinder head sub-assembly.

      Standard lifter bore diameter
      31.000 to 31.021 mm (1.220 to 1.221 in.)

    3. Measure the oil clearance by subtracting the valve lifter diameter measurement from the valve lifter bore diameter measurement.

      Standard oil clearance
      0.024 to 0.055 mm (0.000945 to 0.00217 in.)
      Maximum oil clearance
      0.095 mm (0.00374 in.)

      If the oil clearance is more than the maximum, replace the valve lifter. If necessary, replace the cylinder head sub-assembly.

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    INSPECT CAMSHAFT OIL CLEARANCE

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    INSPECT CAMSHAFT THRUST CLEARANCE

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