Isuzu I-280, I-350 2005-06

Exhaust Manifold

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Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Catalytic converter from the exhaust manifold
     
    Exhaust seal
     
    Air intake assembly
     
    Transmission fill tube bracket nut, if equipped with automatic transmission
     
    Heated Oxygen Sensor (HO 2 S) from exhaust manifold
     
    Exhaust manifold heat shield
     
    Exhaust manifold bolts
     
    Exhaust manifold and gasket
     

  4.  

To install:

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Fig. Exhaust manifold tightening sequence-2.8L engine



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Fig. Exhaust manifold tightening sequence-3.5L engine

  1. Clean the exhaust manifold retainer threads and the gasket mating surfaces.
  2.  
  3. Coat the bolt threads with a suitable threadlock.
  4.  
  5. Install the exhaust manifold and tighten the bolts in sequence to 15 ft. lbs. (20 Nm), tighten the bolts again to 15 ft. lbs. (20 Nm), then tighten the bolts again to 15 ft. lbs. (20 Nm).
  6.  
  7. Install or connect the following:

    Heat shield and tighten the nuts to 89 inch lbs. (10 Nm)
     
    HO 2 S and tighten to 31 ft. lbs. (42 Nm)
     
    Transmission fill tube bracket nut, if equipped with automatic transmission.
     
    Air intake assembly
     
    New exhaust seal to the exhaust manifold flange
     
    Catalytic converter to the manifold. Tighten the nuts to 37 ft. lbs. (50 Nm).
     
    Negative battery cable
     

  8.  

 
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