LaCrosse 2006-2007

Exhaust Manifold

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Removal & Installation



3.6L Engine
Left Side
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the left torque strut bracket bolts.
  4.  
  5. Remove the left torque strut bracket.
  6.  
  7. Remove the left exhaust manifold heat shield bolts.
  8.  
  9. Remove the left exhaust manifold heat shield.
  10.  
  11. Remove the Engine Coolant Temperature (ECT) sensor.
  12.  
  13. Remove the exhaust manifold bolts from the left cylinder head.
  14.  
  15. Remove the left exhaust manifold.
  16.  
  17. Remove and discard the exhaust manifold gasket.
  18.  

To install:

Click image to see an enlarged view

Fig. Left side exhaust manifold-3.6L engine

  1. Position a NEW exhaust manifold gasket onto the left exhaust manifold.
  2.  
  3. Install the exhaust manifold bolts into the left exhaust manifold.
  4.  
  5. Place the left exhaust manifold, exhaust manifold gasket and bolts as an assembly in position on the left cylinder head.
  6.  
  7. Install the exhaust manifold bolts into the left cylinder head. Tighten the exhaust manifold bolts to 18 ft. lbs. (25 Nm).
  8.  
  9. Install the Engine Coolant Temperature (ECT) sensor. Tighten the ECT sensor to 16 ft. lbs. (22 Nm).
  10.  
  11. Install NEW O-rings on the crankshaft position sensor.
  12.  
  13. Place the left exhaust manifold heat shield in position.
  14.  
  15. Install the exhaust manifold heat shield bolts. Tighten the exhaust manifold heat shield bolts to 89 inch lbs. (10 Nm).
  16.  
  17. Install the left torque strut bracket.
  18.  
  19. Install the left torque strut bracket bolts. Tighten the left torque strut bracket bolts to 37 ft. lbs. (50 Nm).
  20.  

Right Side
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the right exhaust manifold heat shield bolts.
  4.  
  5. Remove the right exhaust manifold heat shield.
  6.  
  7. Remove the exhaust manifold bolts from the right cylinder head.
  8.  
  9. Remove the right exhaust manifold.
  10.  
  11. Remove and discard the exhaust manifold gasket.
  12.  

To install:

Click image to see an enlarged view

Fig. Right side exhaust manifold-3.6L engine

  1. Position a NEW exhaust manifold gasket onto the right exhaust manifold.
  2.  
  3. Install the exhaust manifold bolts into the right exhaust manifold.
  4.  
  5. Place the right exhaust manifold, exhaust manifold gasket and bolts as an assembly in position on the right cylinder head.
  6.  
  7. Install the exhaust manifold bolts into the right cylinder head. Tighten the exhaust manifold bolts to 18 ft. lbs. (25 Nm).
  8.  
  9. Place the right exhaust manifold heat shield in position.
  10.  
  11. Install the exhaust manifold heat shield bolts. Tighten the exhaust manifold heat shield bolts to 89 inch lbs. (10 Nm).
  12.  

3.8L Engine
Left Side (Front) Manifold


Click image to see an enlarged view

Fig. Exploded view of the left exhaust manifold mounting-3.8L engine

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

    Negative battery cable
     
    Spark plug wires
     
    Engine oil dipstick and tube
     
    Left side lift bracket, if necessary
     
    2 bolts attaching the left exhaust manifold to the crossover pipe
     
    Exhaust manifold
     

  4.  

To install:

  1. Install or connect the following:

    Exhaust manifold with a new gasket. Torque the studs and bolts gradually and evenly to 22 ft. lbs. (30 Nm).
     
    2 bolts attaching the left exhaust manifold to the crossover pipe. Torque the bolts to 15 ft. lbs. (20 Nm).
     
    Left side lift bracket, if removed
     
    Engine oil dipstick and tube. Torque the bolts to 15 ft. lbs. (20 Nm).
     
    Spark plug wires
     
    Negative battery cable
     

  2.  
  3. Run the engine and check for exhaust leaks.
  4.  

Right Side (Rear) Manifold
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Fuel injector sight shield
     
    Air cleaner assembly
     
    Spark plug wires
     
    Brake booster heat shield
     
    Crossover pipe
     
    Engine harness from the right hand engine lift hook bracket
     
    Transaxle fluid dipstick and tube
     
    Oxygen (O 2 S) sensor
     
    Exhaust Gas Recirculation (EGR) feed pipe bolt from the manifold
     
    Transaxle oil level tube and seal
     
    Exhaust manifold flange nuts
     
    Front exhaust pipe
     
    Engine lift bracket
     
    Exhaust manifold
     

  4.  

To install:

  1. Install or connect the following:

    Manifold to the cylinder head and crossover pipe using new gaskets
     
    Manifold mounting studs. Torque the studs and bolts to 22 ft. lbs. (30 Nm), beginning at the center and working outwards.
     
    Engine lift bracket
     
    Front exhaust pipe
     
    Front exhaust pipe to manifold nuts. Torque the nuts to 22 ft. lbs. (30 Nm).
     
    Transaxle dipstick tube seal and the tube
     
    EGR feed pipe to the manifold
     
    O 2 S sensor
     
    Spark plug wires to the spark plugs
     
    Engine harness to the right hand engine lift hook bracket
     
    Crossover pipe
     
    Brake booster heat shield
     
    Air cleaner assembly
     
    Fuel injector sight shield
     
    Negative battery cable
     

  2.  
  3. Run the engine and check for exhaust leaks.
  4.  

 
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