LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2019 >> Sienna SE, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 14 (Engine Mechanical [2GR-FE] (Service Information)) >> Cylinder Head >> Inspection [12/2015 - 08/2016] >> Procedure

Inspection [12/2015 - 08/2016]: Procedure

WARNING: This page is about a different car, the 2016 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT CYLINDER HEAD SUB-ASSEMBLY 
    1. Using a precision straightedge and feeler gauge, measure the warpage of the contact surface of the cylinder block sub-assembly and manifolds.
      GTY688418Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Cylinder Head Lower Side
      *b Intake Side
      *c Exhaust Side

      Standard Warpage

      Item Warpage
      Cylinder head lower 0.05 mm (0.00197 in.)
      Intake 0.08 mm (0.00315 in.)
      Exhaust 0.08 mm (0.00315 in.)

      Maximum Warpage

      Item Warpage
      Cylinder head lower 0.10 mm (0.00394 in.)
      Intake 0.10 mm (0.00394 in.)
      Exhaust 0.10 mm (0.00394 in.)

      If the warpage is greater 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 cylinder surface for cracks.
      GTY104847Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If cracked, 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

      Valve stem diameter

      5.470 to 5.485 mm (0.2154 to 0.2159 in.)

      If the valve stem is not as specified, check the oil clearance.

    2. Using a vernier caliper, measure the valve head margin thickness.
      GTY686813Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *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.
      GTY217956Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *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

      Valve stem diameter

      5.465 to 5.480 mm (0.2152 to 0.2157 in.)

      If the valve stem is not as specified, check the oil clearance.

    2. Using a vernier caliper, measure the valve head margin thickness.
      GTY721084Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *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.
      GTY221117Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *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 valve seat.
    3. Check the valve face and valve spring seat by using the following procedure:
      GTY693894Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Width
      1. If Prussian blue appears around the entire valve face, the valve face is concentric. If not, replace the valve.
      2. If Prussian blue appears around the entire valve seat, the guide and valve face are concentric. If not, resurface the valve spring seat.
      3. Check that the valve spring seat contacts in the middle of the valve face with the width between 1.1 and 1.6 mm (0.0433 and 0.0630 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 valve spring seat.
    3. Check the valve face and valve spring seat by using the following procedure:
      GTY693894Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Width
      1. If Prussian blue appears around the entire valve face, the valve face is concentric. If not, replace the valve.
      2. If Prussian blue appears around the entire valve seat, the guide and valve face are concentric. If not, resurface the valve spring seat.
      3. Check that the valve spring seat contacts in the middle of the valve face with the width between 1.1 and 1.6 mm (0.0433 and 0.0630 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. Using a vernier caliper, measure the free length of the inner compression spring.
        GTY136256Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        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.
        GTY473005Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard Free Length

        50.55 mm (1.9902 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.
        GTY480071Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Deviation
        *b 40 mm (1.57 in.)

        Maximum Deviation

        1.4 mm (0.0551 in.)

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

  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

      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 Clearance
      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 Clearance
      Intake 0.08 mm (0.00315 in.)
      Exhaust 0.10 mm (0.00394 in.)

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

scientia non olet · About LEMON Manuals