CYLINDER HEAD INSPECTION


  1. INSPECT CYLINDER HEAD SUB-ASSEMBLY


    1. A01CB6VE06

      Using a precision straight edge and feeler gauge, measure the warpage of the contact surface of the cylinder block sub-assembly and manifolds.

      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. A01CFIU

      Using a dye penetrate, check the intake ports, exhaust ports and cylinder surface for cracks.

      If cracked, replace the cylinder head sub-assembly.

  3. INSPECT INTAKE VALVE


    1. A01CCAM

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

      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. A01CBEYE01

      Using a vernier caliper, measure the valve head 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. A01CDYWE01

      Using a vernier caliper, measure the valve 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. A01CFYO

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

      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. A01CDGDE01

      Using a vernier caliper, measure the valve head 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. A01CE30E01

      Using a vernier caliper, measure the valve 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. A01CCX6E01

      Check the valve face and valve spring seat by using the following procedure:


      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 1.5 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 valve spring seat.

    3. A01CCX6E01

      Check the valve face and valve spring seat by using the following procedure:


      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 1.5 mm (0.0433 and 0.0591 in.).

  7. INSPECT INNER COMPRESSION SPRING


    1. A01CDW9

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

      Free length
      45.46 mm (1.7898 in.)

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

    2. A01CDSIE01

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

      Maximum deviation
      1.0 mm (0.0394 in.)
      Maximum angle (reference)
      2°

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

  8. INSPECT VALVE GUIDE BUSH OIL CLEARANCE


    1. A01CE4C

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

      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 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.