ГОЛОВКА БЛОКА ЦИЛИНДРОВ ПРОВЕРКА

PROCEDURE


  1. INSPECT CYLINDER HEAD SUB-ASSEMBLY


    1. Using a precision straightedge and feeler gauge, measure the warpage of the contact surfaces where the cylinder head sub-assembly contacts the cylinder block sub-assembly, intake manifold and exhaust manifold converter sub-assembly (TWC: Front Catalyst).

      B006P6QC09
      *a Bottom Side *b Intake Manifold Side
      *c Exhaust Manifold Converter Sub-assembly (TWC: Front Catalyst) Side - -
      Maximum Warpage
      Item Specified Condition
      Bottom side 0.05 mm (0.00197 in.)
      Intake manifold side 0.10 mm (0.00394 in.)
      Exhaust manifold converter sub-assembly (TWC: Front Catalyst) side 0.10 mm (0.00394 in.)

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

    2. A01UEPZ

      Using a dye penetrant, check the intake ports, exhaust ports and cylinder head sub-assembly surface for cracks.

      If cracked are found, replace the cylinder head sub-assembly.

  2. INSPECT COMPRESSION SPRING

    Tech Tips

    Type A and Type B can be distinguished by the shape of the compression spring.

    Type Compression Spring Shape
    A Straight
    B Tapered
    B006O5EC01
    *A Type A
    *B Type B
    *1 No. 1 Valve Rocker Arm Sub-assembly
    *2 Valve Spring Retainer
    *3 Compression Spring
    *4 Valve Lash Adjuster Assembly

    1. Type A:


      1. A01UD6L

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

        Standard Free Length
        47.2 to 49.2 mm (1.86 to 1.94 in.)

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

      2. B006LMXC27
        *a Deviation

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

        Maximum Deviation
        1.0 mm (0.0394 in.)

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

    2. Type B:


      1. B006KO5

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

        Standard Free Length
        47.38 mm (1.87 in.)

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

      2. B006QW9C19
        *a Deviation
        *b 30 mm (1.18 in.)

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

        Maximum Deviation
        1.0 mm (0.0394 in.)

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

    3. Type B:


      1. B006KO5

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

        Standard Free Length
        47.27 mm (1.86 in.)

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

      2. B006QW9C19
        *a Deviation
        *b 30 mm (1.18 in.)

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

        Maximum Deviation
        1.0 mm (0.0394 in.)

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

  3. INSPECT INTAKE VALVE


    1. A01UEME

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

      Standard Valve Stem Diameter
      5.470 to 5.485 mm (0.215 to 0.216 in.)

      If the valve stem diameter is not as specified, check the intake valve guide bush oil clearance.

    2. B006QFAC10
      *a Margin Thickness

      Using a vernier caliper, measure the valve head margin thickness.

      Standard Margin Thickness
      1.0 mm (0.0394 in.)
      Minimum Margin Thickness
      0.50 mm (0.0197 in.)

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

    3. B006P9QC09
      *a Overall Length

      Using a vernier caliper, measure the overall length of the intake valve.

      Standard Overall Length
      103.92 mm (4.09 in.)
      Minimum Overall Length
      103.42 mm (4.07 in.)

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

  4. INSPECT EXHAUST VALVE


    1. A01UF5M

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

      Standard Valve Stem Diameter
      5.465 to 5.480 mm (0.215 to 0.216 in.)

      If the valve stem diameter is not as specified, check the exhaust valve guide bush oil clearance.

    2. B006MNXC12
      *a Margin Thickness

      Using a vernier caliper, measure the valve head margin thickness.

      Standard Margin Thickness
      1.0 mm (0.0394 in.)
      Minimum Margin Thickness
      0.50 mm (0.0197 in.)

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

    3. B006R9OC09
      *a Overall Length

      Using a vernier caliper, measure the overall length of the exhaust valve.

      Standard Overall Length
      112.91 mm (4.45 in.)
      Minimum Overall Length
      112.41 mm (4.43 in.)

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

  5. INSPECT VALVE GUIDE BUSH OIL CLEARANCE


    1. A01UEZ0

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

      Standard Valve Guide Bush Inside Diameter
      5.510 to 5.530 mm (0.217 to 0.218 in.)

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

      Standard Oil Clearance
      Item Specified Condition
      Intake 0.025 to 0.060 mm (0.000984 to 0.00236 in.)
      Exhaust 0.030 to 0.065 mm (0.00118 to 0.00256 in.)
      Maximum Oil Clearance
      Item Specified Condition
      Intake 0.08 mm (0.00315 in.)
      Exhaust 0.10 mm (0.00394 in.)

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

  6. INSPECT INTAKE VALVE SEAT


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

    2. B006MJ3C12
      *a Width

      Lightly press the valve face against the intake valve seat.

      Tech Tips

      Do not rotate the intake valve while pressing it.

    3. Check the valve face and intake valve seat by using the following procedure:


      1. If Prussian blue appears 360° around the entire intake valve face, the valve face is concentric. If the valve face is not concentric replace the intake valve.

      2. If Prussian blue appears 360° around the entire intake valve seat, the intake valve seat and valve face are concentric.

        If the valve face is not concentric resurface the intake valve seat.

      3. Measure the width of the contact area of the intake valve seat and valve face.

        Standard Width
        1.0 and 1.4 mm (0.0394 and 0.0551 in.)

  7. INSPECT EXHAUST VALVE SEAT


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

    2. B006N7EC08
      *a Width

      Lightly press the valve face against the exhaust valve seat.

      Tech Tips

      Do not rotate the exhaust valve while pressing it.

    3. Check the valve face and exhaust valve seat by using the following procedure:


      1. If Prussian blue appears 360° around the entire exhaust valve face, the valve face is concentric. If the valve face is not concentric replace the exhaust valve.

      2. If Prussian blue appears 360° around the entire exhaust valve seat, the exhaust valve seat and valve face are concentric.

        If the valve face is not concentric resurface the exhaust valve seat.

      3. Measure the width of the contact area of the exhaust valve seat and valve face.

        Standard Width
        1.2 and 1.6 mm (0.0472 and 0.0630 in.)

  8. INSPECT CAMSHAFT THRUST CLEARANCE


    1. Clean the No. 1 camshaft bearing cap, No. 2 camshaft bearing cap, 3 No. 3 camshaft bearing caps, camshaft housing sub-assembly and camshaft journals.

    2. Place the camshaft and No. 2 camshaft on the camshaft housing sub-assembly.

    3. Install the camshaft bearing caps.

      Click here

    4. Install the camshaft housing sub-assembly.

      Click here

    5. A01UETI

      Using a dial indicator, measure the thrust clearance while moving the camshaft back and forth.

      Standard Thrust Clearance
      Item Specified Condition
      Intake 0.060 to 0.155 mm (0.00236 to 0.00610 in.)
      Exhaust 0.060 to 0.155 mm (0.00236 to 0.00610 in.)
      Maximum Thrust Clearance
      Item Specified Condition
      Intake 0.170 mm (0.00669 in.)
      Exhaust 0.170 mm (0.00669 in.)

      If the thrust clearance is more than the maximum, replace the camshaft housing sub-assembly. If the thrust surface is damaged, replace the camshaft.