Exhaust Manifold Pipe Replacement 3.5L (L66)

1. Raise the vehicle on a hoist. Refer to Lifting and Jacking the Vehicle .



2. Remove the oil pan bracket (2) and bolts (1, 3).



3. Remove the exhaust pipe flange to the catalytic converter nuts (3) .
4. Remove the exhaust pipe to mid muffler pipe nuts.
5. Remove the front exhaust pipe.
6. Fully remove and discard the used gaskets.

Notice: Excessive flexing of the exhaust pipe may damage the flex coupling. Limit flexing to 12 degrees.

1. Position pipe into vehicle, and install new gaskets onto converter studs.

Notice: Refer to Fastener Notice in the Preface section.

2. Assemble exhaust pipe to converters, install new nuts and tighten .

Tighten
Tighten the nuts to 18 N·m (13 lb ft).

3. Install the new gasket (1) onto the exhaust pipe rear flange.



4. Assemble the front pipe to rear pipe, install the nuts and tighten.

Tighten
Tighten the front pipe-to-rear pipe nuts to 30 N·m (22 lb ft).




5. Install the oil pan bracket (2) and bolts (1, 3) and tighten.

Tighten
Tighten the bolts to 20 N·m (14 lb ft).

6. Lower the vehicle. Refer to Lifting and Jacking the Vehicle .
7. Start the engine and check for exhaust leaks.