Miata 1990-1997

Exhaust Manifold

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Removal & Installation





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Fig. The components for the exhaust system

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the retaining bolt, and remove the exhaust manifold insulator.
  4.  
  5. Disconnect the oxygen sensor electrical connector. Remove the oxygen sensor.
  6.  
  7. Raise and safely support the vehicle. Remove the nuts from the exhaust pipe flange and disconnect the exhaust pipe from the manifold.
  8.  
  9. Lower the vehicle.
  10.  
  11. Remove the mounting nuts/bolts and remove the exhaust manifold.
  12.  

To install:

  1. Make sure all gasket mating surfaces are clean prior to assembly.
  2.  
  3. Use new gaskets and tighten the exhaust manifold nuts/bolts to the cylinder head. Torque to 29-33 ft. lbs. (39-46 Nm).
  4.  
  5. Raise and safely support the vehicle.
  6.  
  7. Use a new gasket and tighten the exhaust pipe flange, to the exhaust manifold nuts, to 34 ft. lbs. (46 Nm).
  8.  
  9. Lower the vehicle. Install the oxygen sensor, and connect the electrical connector.
  10.  
  11. Install the exhaust manifold insulator, and tighten the mounting bolt to 70-95 inch lbs. (8-11 Nm).
  12.  
  13. Connect the negative battery cable.
  14.  

 
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