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:

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:

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

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

   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. 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