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Exhaust Manifold: Replacement

  1. REMOVE ENGINE ASSY (See REMOVAL AND INSTALLATION )
  2. REMOVE HEATED OXYGEN SENSOR
  3. REMOVE EXHAUST MANIFOLD HEAT INSULATOR NO.1
  4. REMOVE EXHAUST MANIFOLD HEAT INSULATOR NO.2
  5. REMOVE EXHAUST MANIFOLD SUB-ASSY RH
  6. REMOVE EXHAUST MANIFOLD SUB-ASSY LH
  7. INSPECT EXHAUST MANIFOLD SUB-ASSY RH
    1. Using a precision straight edge and feeler gauge, measure the surface contacting the cylinder head for warpage.

      Maximum warpage: 0.50 mm (0.0197 in.) 

      If the warpage is greater than maximum, replace the manifold.

      Fig 1: Using A Precision Straight Edge And Feeler Gauge, Measure Surface Contacting Cylinder
      G01321915Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. INSPECT EXHAUST MANIFOLD SUB-ASSY LH
    1. Employ the same manner described above to the other side.
  9. INSTALL EXHAUST MANIFOLD SUB-ASSY LH
    NOTE:
    • Install a new gasket with the white mark facing the exhaust manifold side.
    • Uniformly tighten the nuts diagonally.

      Torque: 44 N.m (450 kgf.cm, 32 ft.lbf)

  10. INSTALL EXHAUST MANIFOLD SUB-ASSY RH
    1. Employ the same manner described above to the other side.
  11. INSTALL EXHAUST MANIFOLD HEAT INSULATOR NO.2
  12. INSTALL EXHAUST MANIFOLD HEAT INSULATOR NO.1
  13. INSTALL HEATED OXYGEN SENSOR
  14. INSTALL ENGINE ASSY (See REMOVAL AND INSTALLATION )
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