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Inspection [08/2014 - 11/2016]: Procedure

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  1. INSPECT CYLINDER HEAD SUB-ASSEMBLY 
    1. Using a precision straightedge and feeler gauge, measure the warpage of the surfaces which contact the cylinder block sub-assembly and manifolds.
      GTY423985Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A Bottom Side *B Intake Manifold Side
      *C Exhaust Manifold Side - -

      Standard Warpage

      Item Specified Condition
      Bottom Side 0.05 mm (0.00197 in.)
      Intake Manifold Side 0.08 mm (0.00315 in.)
      Exhaust Manifold Side 0.08 mm (0.00315 in.)

      Maximum Warpage

      Item Specified Condition
      Bottom Side 0.10 mm (0.00394 in.)
      Intake Manifold Side 0.10 mm (0.00394 in.)
      Exhaust Manifold Side 0.10 mm (0.00394 in.)

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

  2. INSPECT CYLINDER HEAD FOR CRACKS 
    1. Using a dye penetrant, check the intake ports, exhaust ports and bottom surface of the cylinder head sub-assembly for cracks.
      GTY104847Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

  3. INSPECT INTAKE VALVE 
    1. Using a micrometer, measure the diameter of the valve stem.
      GTY139468Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Valve Stem Diameter

      5.470 to 5.485 mm (0.2154 to 0.2159 in.)

      If the diameter is not as specified, check the oil clearance.

    2. Using a vernier caliper, measure the valve head margin thickness.
      GTY437514Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Margin Thickness

      Standard Margin Thickness

      1.0 mm (0.0394 in.)

      Minimum Margin Thickness

      0.5 mm (0.0197 in.)

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

    3. Using a vernier caliper, measure the valve overall length.
      GTY428444Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Overall Length

      Standard Overall Length

      105.85 mm (4.1673 in.)

      Minimum Overall Length

      105.35 mm (4.1476 in.)

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

  4. INSPECT EXHAUST VALVE 
    1. Using a micrometer, measure the diameter of the valve stem.
      GTY146161Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Valve Stem Diameter

      5.465 to 5.480 mm (0.2152 to 0.2157 in.)

      If the diameter is not as specified, check the oil clearance.

    2. Using a vernier caliper, measure the valve head margin thickness.
      GTY452632Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Margin Thickness

      Standard Margin Thickness

      1.0 mm (0.0394 in.)

      Minimum Margin Thickness

      0.5 mm (0.0197 in.)

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

    3. Using a vernier caliper, measure the valve overall length.
      GTY431000Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Overall Length

      Standard Overall Length

      110.40 mm (4.3464 in.)

      Minimum Overall Length

      109.90 mm (4.3268 in.)

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

  5. INSPECT INTAKE VALVE SEAT 
    1. Apply a light coat of Prussian blue to the valve face.
    2. Lightly press the valve face against the intake valve seat.
    3. Check the valve face and intake valve seat by using the following procedure:
      GTY439532Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Width
      1. If Prussian blue appears around the entire valve face, the valve face is concentric. If not, replace the intake valve.
      2. If Prussian blue appears around the entire intake valve seat, the intake valve seat and valve face are concentric. If not, resurface the intake valve seat.
      3. Check that the intake valve seat contacts the middle of the valve face with the width between 1.1 and 1.5 mm (0.0433 and 0.0591 in.).
  6. INSPECT EXHAUST VALVE SEAT 
    1. Apply a light coat of Prussian blue to the valve face.
    2. Lightly press the valve face against the exhaust valve seat.
    3. Check the valve face and exhaust valve seat by using the following procedure:
      GTY439532Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Width
      1. If Prussian blue appears around the entire valve face, the valve face is concentric. If not, replace the exhaust valve.
      2. If Prussian blue appears around the entire exhaust valve seat, the exhaust valve seat and valve face are concentric. If not, resurface the exhaust valve seat.
      3. Check that the exhaust valve seat contacts the middle of the valve face with the width between 1.1 and 1.5 mm (0.0433 and 0.0591 in.).
  7. INSPECT INNER COMPRESSION SPRING 

    HINT: 

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

    GTY479604Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *A Type A
    *B Type B
    *1 No. 1 Valve Rocker Arm Sub-assembly
    *2 Valve Spring Retainer
    *3 Inner Compression Spring
    *a Valve Spring Retainer Diameter
    *b No. 1 Valve Rocker Arm Sub-assembly Roller Width
    Type No. 1 Valve Rocker Arm Sub-assembly Roller Width Valve Spring Retainer Diameter Inner Compression Spring Shape
    A 10.7 mm (0.421 in.) 23.4 mm (0.921 in.) Straight
    B 8.0 mm (0.315 in.) 18.9 mm (0.744 in.) Taper
    1. Type A:
      1. GTY136256Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

        Standard Free Length

        45.91 mm (1.8075 in.)

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

      2. Using a steel square, measure the deviation of the inner compression spring.
        GTY450123Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Deviation

        Maximum Deviation

        1.0 mm (0.0394 in.)

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

    2. Type B:
      1. Using a vernier caliper, measure the free length of the inner compression spring.

        Standard Free Length

        50.55 mm (1.9902 in.)

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

        GTY473005Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Using a steel square, measure the deviation of the inner compression spring.

        Maximum Deviation

        1.4 mm (0.0551 in.)

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

        GTY480071Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Deviation
        *b 40 mm (1.57 in.)
  8. INSPECT VALVE GUIDE BUSH OIL CLEARANCE 
    1. Using a caliper gauge, measure the inside diameter of the valve guide bush.
      GTY104200Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Valve Guide Bush Inside Diameter

      5.510 to 5.530 mm (0.2169 to 0.2177 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.

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