Removal Procedure
- Raise and suitably support
the vehicle. Refer to
Lifting and Jacking the Vehicle
in General Information.
- Remove the oil pan skid plate bolts and plate, if necessary.
- If equipped with a 4.3L,
4.8L, or 5.3L engine, perform the following:
| • | Remove the clip from around the engine harness and the oxygen
sensor pigtail. |
| • | Disconnect the connector position assurance (CPA) retainer. |
| • | Disconnect the forward oxygen sensor electrical connector. |
- If equipped with a 4.3L,
4.8L, or 5.3L engine, perform the following:
| • | Unclip the oxygen sensor electrical connector from the hose clip. |
| • | Disconnect the CPA retainer. |
| • | Disconnect the oxygen sensor electrical connector (1). |
- If equipped with a 6.0L
or 8.1L engine, perform the following:
| • | Disconnect the CPA retainer. |
| • | Disconnect the oxygen sensor electrical connector (1). |
- Support the catalytic converter or exhaust manifold pipe with
adjustable jackstands.
- If equipped with a 4.3L,
4.8L, or 5.3L engine, remove the left exhaust manifold pipe nuts.
- If equipped with a 4.3L,
4.8L, or 5.3L engine, remove the right exhaust manifold pipe nuts.
- If equipped with a 6.0L
or 8.1L engine, remove the right exhaust manifold pipe nuts.
- If equipped with a 6.0L
or 8.1L engine, perform the following:
| • | Remove the left exhaust manifold pipe nuts. |
| • | Remove the exhaust hanger mounting bracket bolts. |
- Lower the catalytic converter or exhaust manifold pipe using the
adjustable jackstands.
- Remove the exhaust manifold pipe seal(s).
Installation Procedure
- Install the exhaust manifold
pipe seal(s).
- Raise the catalytic converter or exhaust manifold pipe using the
adjustable jackstands.
Notice: Use the correct fastener in the correct location. Replacement fasteners
must be the correct part number for that application. Fasteners requiring
replacement or fasteners requiring the use of thread locking compound or sealant
are identified in the service procedure. Do not use paints, lubricants, or
corrosion inhibitors on fasteners or fastener joint surfaces unless specified.
These coatings affect fastener torque and joint clamping force and may damage
the fastener. Use the correct tightening sequence and specifications when
installing fasteners in order to avoid damage to parts and systems.
- If equipped with
a 6.0L or 8.1L engine, perform the following:
| • | Install the exhaust hanger mounting bracket bolts. |
| • | Install the left exhaust manifold pipe nuts. |
Tighten
| • | Tighten the transmission bolts to 100 N·m (74 lb ft).
|
| • | Tighten the exhaust pipe hanger bracket bolts to 12 N·m
(106 lb in).
|
| • | Tighten the exhaust manifold pipe nuts to 50 N·m
(39 lb ft).
|
- If equipped with a 6.0L
or 8.1L engine, install the right exhaust manifold pipe nuts.
Tighten
Tighten the exhaust manifold pipe nuts to 50 N·m (39 lb ft).
- If equipped with a 4.3L,
4.8L, or 5.3L engine, install the right exhaust manifold pipe nuts.
- If equipped with a 4.3L,
4.8L, or 5.3L engine, install the left exhaust manifold pipe nuts.
Tighten
Tighten the exhaust manifold pipe nuts to 50 N·m (39 lb ft).
- If equipped with a 6.0L
or 8.1L engine, perform the following:
| • | Connect the oxygen sensor electrical connector (1). |
| • | Connect the CPA retainer. |
- Remove the adjustable jackstands from catalytic converter or exhaust
manifold pipe.
- If equipped with a 4.3L,
4.8L, or 5.3L engine, perform the following:
| • | Connect the oxygen sensor electrical connector (1). |
| • | Connect the CPA retainer. |
| • | Clip the oxygen sensor electrical connector to the hose clip. |
- If equipped with a 4.3L,
4.8L, or 5.3L engine, perform the following:
| • | Connect the forward oxygen sensor electrical connector. |
| • | Connect the CPA retainer. |
| • | Install the clip around the engine harness and the oxygen sensor
pigtail. |
- Install the oil pan skid
plate and bolts, if necessary.
Tighten
Tighten the oil pan skid plate bolts to 20 N·m (15 lb ft).
- Lower the vehicle.
