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How to Replace Exhaust Manifold on Buick LaCrosse?

The details to replace Exhaust Manifold are as follows:---


Exhaust Manifold
REMOVAL & INSTALLATION Procedure is Mentioned below:----

The Info for Both 3.6L Engine & 3.8L Engine is mentioned.
3.6L Engine
Left Side
  1. Before servicing the vehicle, refer to the Precautions Section.
  2. Remove the left torque strut bracket bolts.
  3. Remove the left torque strut bracket.
  4. Remove the left exhaust manifold heat shield bolts.
  5. Remove the left exhaust manifold heat shield.
  6. Remove the Engine Coolant Temperature (ECT) sensor.
  7. Remove the exhaust manifold bolts from the left cylinder head.
  8. Remove the left exhaust manifold.
  9. Remove and discard the exhaust manifold gasket.
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. Install the exhaust manifold bolts into the left exhaust manifold.
  3. Place the left exhaust manifold, exhaust manifold gasket and bolts as an assembly in position on the left cylinder head.
  4. Install the exhaust manifold bolts into the left cylinder head. Tighten the exhaust manifold bolts to 18 ft. lbs. (25 Nm).
  5. Install the Engine Coolant Temperature (ECT) sensor. Tighten the ECT sensor to 16 ft. lbs. (22 Nm).
  6. Install NEW O-rings on the crankshaft position sensor.
  7. Place the left exhaust manifold heat shield in position.
  8. Install the exhaust manifold heat shield bolts. Tighten the exhaust manifold heat shield bolts to 89 inch lbs. (10 Nm).
  9. Install the left torque strut bracket.
  10. Install the left torque strut bracket bolts. Tighten the left torque strut bracket bolts to 37 ft. lbs. (50 Nm).
Right Side
  1. Before servicing the vehicle, refer to the Precautions Section.
  2. Remove the right exhaust manifold heat shield bolts.
  3. Remove the right exhaust manifold heat shield.
  4. Remove the exhaust manifold bolts from the right cylinder head.
  5. Remove the right exhaust manifold.
  6. Remove and discard the exhaust manifold gasket.
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. Install the exhaust manifold bolts into the right exhaust manifold.
  3. Place the right exhaust manifold, exhaust manifold gasket and bolts as an assembly in position on the right cylinder head.
  4. Install the exhaust manifold bolts into the right cylinder head. Tighten the exhaust manifold bolts to 18 ft. lbs. (25 Nm).
  5. Place the right exhaust manifold heat shield in position.
  6. Install the exhaust manifold heat shield bolts. Tighten the exhaust manifold heat shield bolts to 89 inch lbs. (10 Nm).
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. 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
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. Run the engine and check for exhaust leaks.
Right Side (Rear) Manifold
  1. Before servicing the vehicle, refer to the Precautions Section.
  2. 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
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
    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. Run the engine and check for exhaust leaks.

These details will help.
Thanks.

FOR MORE HELP GO TO: ---

Car repair guide?

http://technoanswers.blogspot.in/2012/03/car-repair-guide.html



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