Infinity_QX4_1998-2003

Exhaust Manifold

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Removal & Installation



3.3L And 3.5L Engines
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove the or disconnect the following:

    Negative battery cable
     
    Exhaust manifold heat shields
     
    Exhaust Gas Recirculation (EGR) tube
     
    Heated Oxygen (HO 2 S) sensor connectors
     
    Exhaust front pipes
     
    Exhaust manifolds with catalytic converters attached. Loosen the nuts in the reverse of the torque sequence.
     

  4.  

To install:

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Fig. Exhaust manifold torque sequence-3.3L engine



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Fig. Right exhaust manifold torque sequence-3.5L engine



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Fig. Exhaust manifold torque sequence-3.5L engine

  1. Install or connect the following:

    Exhaust manifolds with catalytic converters attached. Tighten the nuts in sequence to 21 - 25 ft. lbs. (28 - 33 Nm).
     
    Exhaust front pipes. Tighten the bolts to 21 - 25 ft. lbs. (28 - 33 Nm).
     
    Heated Oxygen (HO 2 S) sensor connectors
     
    EGR tube. Tighten the flange fittings to 29 - 36 ft. lbs. (39 - 49 Nm).
     
    Exhaust manifold heat shields. Tighten the bolts to 84 - 96 inch lbs. (9 - 11 Nm)
     
    Negative battery cable
     

  2.  
  3. Start the engine and check for leaks.
  4.  

 
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