Toyota Tundra 2001-06

Exhaust Manifold

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Removal & Installation



3.4L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Exhaust crossover pipe, from the exhaust manifold by removing the 3 nuts
     
    Exhaust Gas Recirculation (EGR) pipe, from the exhaust manifold, on the left manifold equipped with an EGR valve
     
    Exhaust manifold heat insulator, by removing the 3 nuts
     
    Exhaust manifold
     

  4.  


    Click image to see an enlarged view

    Fig. Exhaust crossover pipe mounting nut locations-3.4L engine



    Click image to see an enlarged view

    Fig. Exhaust manifold nuts-3.4L engine


To install:

  1. Install or connect the following:

    Exhaust manifold, using a new gasket. Tighten the nuts to 30 ft. lbs. (40 Nm).
     
    Exhaust heat insulator. Tighten the nuts to 71 inch lbs. (8 Nm).
     
    EGR pipe to the exhaust manifold, if equipped with an EGR valve. Tighten the manifold nuts to 14 ft. lbs. (18 Nm) and the clamp nuts to 71 inch lbs. (8 Nm).
     
    Crossover pipe to the exhaust manifold, using a new gasket. Tighten the nuts to 33 ft. lbs. (45 Nm).
     

  2.  

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

    Exhaust crossover pipe, from the exhaust manifold by removing the 3 nuts
     
    Exhaust Gas Recirculation (EGR) pipe, from the exhaust manifold, on the left manifold equipped with an EGR valve
     
    Exhaust manifold heat insulator, by removing the 3 nuts
     
    Exhaust manifold

    Click image to see an enlarged view

    Fig. Exhaust crossover pipe mounting nut locations-3.4L engine



    Click image to see an enlarged view

    Fig. Exhaust manifold nuts-3.4L engine

     

  4.  

To install:

  1. Install or connect the following:

    Exhaust manifold, using a new gasket. Tighten the nuts to 30 ft. lbs. (40 Nm).
     
    Exhaust heat insulator. Tighten the nuts to 71 inch lbs. (8 Nm).
     
    EGR pipe to the exhaust manifold, if equipped with an EGR valve. Tighten the manifold nuts to 14 ft. lbs. (18 Nm) and the clamp nuts to 71 inch lbs. (8 Nm).
     
    Crossover pipe to the exhaust manifold, using a new gasket. Tighten the nuts to 33 ft. lbs. (45 Nm).
     

  2.  

4.0L Engine
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Disconnect the exhaust manifold to exhaust flange nuts.
  6.  
  7. Remove the necessary components to gain access to the exhaust manifold retaining bolts.
  8.  
  9. Remove the exhaust manifold retaining nuts. Discard the nuts. Remove the exhaust manifold from the engine.
  10.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  
  3. Be sure to use new gaskets. Be sure to use new retaining nuts.
  4.  

4.7L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Attach a hoist to the engine lifting eyes.
  4.  
  5. Remove or disconnect the following:

    Negative battery cable
     
    Heated Oxygen (HO2S) sensor connectors
     
    Exhaust manifold heat shield
     
    Exhaust front pipe
     
    Motor mount
     
    Motor mount bracket
     
    Exhaust manifold
     

  6.  

To install:


NOTE
Use new exhaust manifold nuts for assembly.

  1. Install or connect the following:

    Exhaust manifold. Tighten the nuts to 32 ft. lbs. (44 Nm).
     
    Motor mount bracket. Tighten the bolts to 27 ft. lbs. (36 Nm).
     
    Motor mount. Tighten the fasteners to 22 ft. lbs. (30 Nm).
     
    Exhaust front pipe. Tighten the nuts to 46 ft. lbs. (62 Nm).
     
    Exhaust manifold heat shield
     
    HO2S sensor connectors
     
    Negative battery cable
     

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

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Attach a hoist to the engine lifting eyes.
  4.  
  5. Remove or disconnect the following:

    Negative battery cable
     
    Heated Oxygen (HO 2 S) sensor connectors
     
    Exhaust manifold heat shield
     
    Exhaust front pipe
     
    Motor mount
     
    Motor mount bracket
     
    Exhaust manifold
     

  6.  

To install:


NOTE
Use new exhaust manifold nuts for assembly.

  1. Install or connect the following:

    Exhaust manifold. Tighten the nuts to 32 ft. lbs. (44 Nm).
     
    Motor mount bracket. Tighten the bolts to 27 ft. lbs. (36 Nm).
     
    Motor mount. Tighten the fasteners to 22 ft. lbs. (30 Nm).
     
    Exhaust front pipe. Tighten the nuts to 46 ft. lbs. (62 Nm).
     
    Exhaust manifold heat shield
     
    HO 2 S sensor connectors
     
    Negative battery cable
     

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

 
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