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Engine Exhaust System Chevrolet Captiva I рестайлинг

Exhaust 16 illustrations ~1202 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
3-Way Catalytic Converter to Front Pipe Nut50 N.m37 lb ft
Catalytic Converter to Cylinder Head (3.0L)- First Pass20 N.m15 lb ft
Catalytic Converter to Cylinder Head (3.0L)- Second Pass46 N.m34 lb ft
Catalytic Converter Brace Nut/Bolt (2.4L)50 N.m37 lb ft
Catalytic Converter Brace Nut/Bolt at Engine Block (2.4L)50 N.m37 lb ft
Catalytic Converter-to-Exhaust Manifold Nut (2.4L)50 N.m37 lb ft
Catalytic Converter-to-Exhaust Muffler Pipe Nut (2.4L)58 N.m43 lb ft
Catalytic Converter-to-Front Pipe (3.0L)50 N.m37 lb ft
Catalytic Converter Heat Shield Bolts10 N.m89 lb in
Catalytic Converter Nuts (2.4L)52 N.m38 lb ft
Exhaust Manifold Nuts (2.4L)14 N.m10 lb ft
Exhaust Muffler-to-Catalytic Converter Nuts30 N.m22 lb ft
Exhaust Muffler Resonator-to-Exhaust Mufflers (3.0L)40 N.m29 lb ft

Fastener Tightening Specifications

Symptoms - Engine Exhaust

  1. Review the exhaust system description in order to familiarize yourself with the exhaust system components and the intended function of the components. Refer to «Exhaust System Description»(/chevrolet/captiva/i-2011-2013/remont/exhaust/#engine-exhaust-system__exhaust-system-description) .
  2. All diagnostics on a vehicle should follow a logical process. Strategy Based Diagnostics is a uniform approach for repairing all systems. The diagnostic flow is the place to start when repairs are necessary and may always be used in order to resolve a system problem. For a detailed explanation, refer to «Strategy Based Diagnosis»(/chevrolet/captiva/i-2011-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) .

Visual/Physical Inspection

  1. Inspect for aftermarket or non-OEM devices such as, but not limited to; tailpipe extensions, headers, and exhaust cutouts. Any aftermarket exhaust system devices could affect the operation and proper performance of the exhaust system.
  2. Verify the exact operating conditions under which the concern exists. Note factors such as engine RPM, engine temperature, engine load, and frequency of concern.
  3. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause any symptom.

Intermittent

Test the vehicle under the same conditions that the customer reported in order to verify the system is operating as designed.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

  1. Loss of power Refer to «Restricted Exhaust»(/chevrolet/captiva/i-2011-2013/remont/exhaust/#engine-exhaust-system__restricted-exhaust)
  2. Poor acceleration Refer to «Restricted Exhaust»(/chevrolet/captiva/i-2011-2013/remont/exhaust/#engine-exhaust-system__restricted-exhaust)
  3. Poor fuel economy Refer to «Restricted Exhaust»(/chevrolet/captiva/i-2011-2013/remont/exhaust/#engine-exhaust-system__restricted-exhaust)
  4. Excessive smoke diesel Refer to «Restricted Exhaust»(/chevrolet/captiva/i-2011-2013/remont/exhaust/#engine-exhaust-system__restricted-exhaust)
  5. Exhaust rattle noise Refer to «Exhaust Noise»(/chevrolet/captiva/i-2011-2013/remont/exhaust/#engine-exhaust-system__exhaust-noise)
  6. Loud exhaust noise Refer to «Exhaust Noise»(/chevrolet/captiva/i-2011-2013/remont/exhaust/#engine-exhaust-system__exhaust-noise)
  7. Exhaust buzz, groan, hum noise Refer to «Exhaust Noise»(/chevrolet/captiva/i-2011-2013/remont/exhaust/#engine-exhaust-system__exhaust-noise)

Restricted Exhaust

Special Tools

EN 35314-A Exhaust Back Pressure Gauge

For equivalent regional tools, refer to Special Tools

Diagnostic Aids

WARNINGRefer to Hot Exhaust System Warning .

For dual exhaust systems a quick check of exhaust flow will help determine which side of the exhaust system is restricted. The side that has less exhaust flow is the side that will be suspect, and diagnosis should begin there.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 4 The exhaust system has very low back pressure under normal conditions. If the exhaust system is restricted, a significant increase in the exhaust pressure is noticed on the J-35314-A gauge. Removing the HO2S sensor may set a DTC. When finishing this diagnostic table, be sure to clear all codes.
  2. 5 This step will isolate the catalytic converter from the remainder of the exhaust system.
  3. 8 Confirming that the condition has been fixed is essential. If the symptom still exists and the vehicle has a dual exhaust system, proceed to step 2 and repeat diagnostic procedure on the opposite exhaust pipe.
StepActionValue(s)YesNo
1Did you verify the customers complaint?Go to Step 2
2Did you review the exhaust symptoms diagnostic information and perform the necessary inspections?Go to Step 3Go to Symptoms - Engine Exhaust
3Is the system equipped with dual exhaust?Go to Diagnostic AidsGo to Step 4
4Remove the heated oxygen sensor (HO2S) that is in front of the catalytic converter. Refer to the appropriate procedure. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 , or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (LF1 or 3.0L) . Install the EN 35314-A Exhaust Back Pressure Gauge in place of the HO2S sensor. Start the engine. Increase and monitor the engine speed at 2,500 RPM. Observe the exhaust system back pressure reading on the gauge. Does the reading exceed the specified value?9 kPa (1.25 psi)Go to Step 5Go to Step 8
5Turn the engine OFF and place the ignition in the lock position. Remove the J-35314-A gauge. Reinstall the HO2S sensor. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 , or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (LF1 or 3.0L) . Remove the post-catalyst HO2S sensor. Refer to the appropriate procedure. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (LF1 or 3.0L) , or Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 . Install the J-35314-A gauge in place of the post HO2S sensor. Start the engine. Increase and monitor the engine speed at 2,500 RPM. Observe the exhaust system back pressure reading on the gauge. Does the reading exceed the specified value?9 kPa (1.25 psi)Go to Step 6Go to Step 7
6Inspect the exhaust system for the following conditions: Secondary catalytic converter restricted Damage in the exhaust pipe Debris in the exhaust pipe Muffler or resonator internal failure Two-layer exhaust pipe separation Did you find and correct the condition?Go to Step 8
7Replace the catalytic converter. Refer to Catalytic Converter Replacement - Left Side (3.0L) , or Catalytic Converter Replacement - Right Side (3.0L) . Did you find and correct the condition?Go to Step 8
8Remove the J-35314-A gauge. Reinstall the applicable HO2S sensor. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (LF1 or 3.0L) , or Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 . Clear any codes. Road test the vehicle in order to verify the repair. Did you correct the condition?System OKGo to Step 2

Restricted Exhaust

Exhaust Leakage

ConditionAction
WARNING: Refer to Hot Exhaust System Warning . DEFINITION: An exhaust leak may show stains at the area of the leak. The leak may be felt by holding a hand close to the suspected areas or using a smoke pencil. The leak may make a popping or hissing noise.Refer to Symptoms - Engine Exhaust prior to beginning this table.
Misaligned or improperly installed exhaust system componentsAlign and tighten the exhaust system components to the specifications. Refer to Fastener Tightening Specifications . Ensure the exhaust hangers are in the proper locations and not loose.
Exhaust leaks at the following connections: Exhaust manifold to pipe Flanges Pipe clampsTighten the components to the specifications. Refer to Fastener Tightening Specifications .
Seals or gaskets leaking; Exhaust manifold to cylinder head Exhaust pipes to exhaust manifold Catalytic converter connectionReplace the leaking seal or gasket. Refer to the affected components procedure for service.
Irregularities at the mating surfaces on the flange connectionsRepair as required or replace the affected component. Refer to the affected components procedure for service.
Catalytic Converter cracked or brokenReplace the catalytic converter. Refer to Catalytic Converter Replacement (2.4L) .
Exhaust system component connection welds leakingReplace the leaking component. Refer to the affected component's procedure for service.
Muffler or resonator, if equipped, damaged or leaking at the seamsReplace the affected muffler or resonator, if equipped. Refer to Exhaust Muffler Replacement (NB5) .
WARNING
Refer to Hot Exhaust System Warning .

Exhaust Leakage

Exhaust Noise

ConditionAction
WARNING: Refer to Hot Exhaust System Warning . DEFINITION: An audible or physical noise due to a faulty component or damaged components causing a loose or misaligned exhaust system resulting in a rattle or vibration noise, i.e. buzz, groan, hum.Refer to Symptoms - Engine Exhaust prior to beginning this table.
Popping or hissing noiseExhaust leak-Refer to Exhaust leakage .
Loud exhaustCompare to a known good vehicle. Inspect for a damaged or failed muffler or resonator, if equipped. Replace the faulty muffler or resonator (if equipped). Refer to Exhaust Muffler Replacement (With Dual Exhaust-Left Side) , Exhaust Muffler Replacement (NB5) , Exhaust Muffler Replacement (With Dual Exhaust-Right Side) .
External rattle or vibration noiseInspect for a bent or loose hanger, loose heat shield, or loose clamp. Inspect for a exhaust pipe causing interference. Repair or replace the affected component. Refer to the affected component's service procedure.
Internal rattleTest the components by tapping with a rubber mallet to confirm a rattle. Replace the faulty catalytic converter, resonator, if equipped, or muffler. Refer to Exhaust Muffler Replacement (With Dual Exhaust-Left Side) , Exhaust Muffler Replacement (NB5) , Exhaust Muffler Replacement (With Dual Exhaust-Right Side) .
WARNING
Refer to Hot Exhaust System Warning .

Exhaust Noise

Scheme 1

Scheme 1: Exhaust Manifold Replacement (2.4L)
Scheme 1: Exhaust Manifold Replacement (2.4L)
CalloutComponent Name
Preliminary Procedures Remove the catalytic converter. Refer to Catalytic Converter Replacement (2.4L) . Remove the exhaust manifold heated oxygen sensor. Refer to Heated Oxygen Sensor Replacement - Sensor 1 . Remove the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement (2.4L) .
1Exhaust Manifold Nut (Qty: 10) WARNING: Refer to Hot Exhaust System Warning . CAUTION: Refer to Fastener Caution . Tighten 14 N.m (10 lb ft)
2Exhaust Manifold Procedure Remove and discard the exhaust manifold gasket. Clean any exhaust manifold gasket debris from the cylinder head and exhaust manifold. Install new exhaust manifold gasket. Tighten the exhaust manifold nuts working from the center out.
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Exhaust Manifold Replacement (2.4L)

Scheme 2

Scheme 2: Exhaust Front Pipe Replacement (2.4L)
Scheme 2: Exhaust Front Pipe Replacement (2.4L)
CalloutComponent Name
WARNING: Refer to Hot Exhaust System Warning . Preliminary Procedure Raise and support the vehicle.Refer to Lifting and Jacking the Vehicle Disconnect the heated oxygen sensor and transfer if necessary.Refer to Heated Oxygen Sensor Replacement - Bank 2 Sensor 2
1Catalytic Converter Nuts(Qty: 4) CAUTION: Refer to Fastener Caution . Tighten 52 N.m (38 lb ft).
23-Way Catalytic Converter Nuts (Qty: 2) Tighten 50 N.m (37 lb ft).
3Exhaust Muffler Insulator
4Gasket TIP: Replace with NEW gaskets.
5Exhaust Front Pipe
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Exhaust Front Pipe Replacement (2.4L)

Removal Procedure

  1. Remove the catalytic converter heat shield. Refer to «Catalytic Converter Heat Shield Replacement (2.4L)»(/chevrolet/captiva/i-2011-2013/remont/exhaust/#engine-exhaust-system) .
  2. Remove the exhaust brace bolts (1) and exhaust brace (2).
  3. Remove the exhaust manifold nuts (1) from the catalytic converter.
  4. Remove the exhaust muffler nuts (1) and gasket (2) from the catalytic converter.
  5. Remove the catalytic converter brace bolt (1).
  6. Remove the catalytic converter from the exhaust isolator (2) and carefully lower catalytic converter (4).
  7. Discard the exhaust manifold seal (3).

Installation Procedure

  1. Install the catalytic converter (4) into the exhaust isolator (2) and the rear muffler assembly.
  2. Install a NEW seal (3) and position the catalytic converter into the exhaust manifold.
  3. Install the exhaust manifold nuts (1) and tighten to 50 N.m (37 lb ft).
  4. Install the exhaust muffler nuts (1) to the catalytic converter with a NEW gasket (2). Tighten the nuts to 30 N.m (22 lb ft).
  5. Install the catalytic converter brace bolt (1) and tighten to 50 N.m (37 lb ft).
  6. Install the exhaust brace (2) to the support brackets. Tighten the nuts (1) to 30 N.m (22 lb ft).
  7. Install the catalytic converter heat shield. Refer to «Catalytic Converter Heat Shield Replacement (2.4L)»(/chevrolet/captiva/i-2011-2013/remont/exhaust/#engine-exhaust-system) .
  8. Start the engine and check for exhaust leaks.

Scheme 3

Scheme 3: Catalytic Converter Replacement - Left Side (3.0L)
Scheme 3: Catalytic Converter Replacement - Left Side (3.0L)
CalloutComponent Name
Preliminary Procedure Remove the catalytic converter heat shield.Refer to Catalytic Converter Heat Shield Replacement (3.0L-Front) , Catalytic Converter Heat Shield Replacement (3.0L-Rear) Remove the exhaust front pipe.
1Catalytic Converter Nuts (Qty: 4) WARNING: Refer to Hot Exhaust System Warning . CAUTION: Refer to Fastener Caution . Procedure Disconnect the oxygen sensor electrical connector. Replace the exhaust front pipe nuts and the gasket with new ones. Clean and inspect the studs on the engine cylinder head, replace as necessary. Verify that the studs are fully seated. Stud collar should touch the surface of the engine cylinder head. Tighten nuts in a criss-cross pattern. Tighten First Pass: 20 N.m (15 lb ft) Final Pass: 46 N.m (34 lb ft)
2Gasket If replacing catalytic converter,transfer oxygen sensor. Improperly installed and/or leaking exhaust manifold gaskets may affect vehicle emissions and/or On-Board Diagnostics (OBD) II system performance.
3Catalytic Converter
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Catalytic Converter Replacement - Left Side (3.0L)

Scheme 4

Scheme 4: Catalytic Converter Replacement - Right Side (3.0L)
Scheme 4: Catalytic Converter Replacement - Right Side (3.0L)
CalloutComponent Name
Preliminary Procedure Disconnect the oxygen sensor electrical connectors. Remove the catalytic converter heat shield.Refer to Catalytic Converter Heat Shield Replacement (3.0L-Front) , Catalytic Converter Heat Shield Replacement (3.0L-Rear) Remove the exhaust front pipe.
1Catalytic Converter Nut (Qty: 4) CAUTION: Refer to Fastener Caution . Procedure Replace nuts and gasket with new ones. Clean and inspect the studs on the engine cylinder head, replace as necessary. Verify that the studs are fully seated. Stud collar should touch the surface of the engine cylinder head. Tighten nuts in a criss-cross pattern. Tighten First Pass: 20 N.m (15 lb ft) Final Pass: 46 N.m (34 lb ft)
2Gasket TIP: Improperly installed and/or leaking exhaust manifold gaskets may affect vehicle emissions and/or On-Board Diagnostics (OBD) II system performance.
3Catalytic Converter TIP: If replacing catalytic converter,transfer both oxygen sensors.
CAUTION
Refer to Fastener Caution .

Catalytic Converter Replacement - Right Side (3.0L)

Scheme 5

Scheme 5: Three-Way Catalytic Converter Replacement (3.0L)
Scheme 5: Three-Way Catalytic Converter Replacement (3.0L)
CalloutComponent Name
WARNING: Refer to Hot Exhaust System Warning . Preliminary Procedures Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
1Exhaust Front Pipe Nut (Qty 3) CAUTION: Refer to Fastener Caution . Tighten 30 N.m (22 lb ft)
2Exhaust Muffler Nut (Qty 3) Tighten 30 N.m (22 lb ft)
3Gasket TIP: Discard and replace with a NEW gasket.
43-Way Catalytic Converter
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Three-Way Catalytic Converter Replacement (3.0L)

Scheme 6

Scheme 6: Catalytic Converter Brace Replacement (2.4L)
Scheme 6: Catalytic Converter Brace Replacement (2.4L)
CalloutComponent Name
WARNING: Refer to Hot Exhaust System Warning . Preliminary Procedure Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Remove the catalytic converter. Refer to Catalytic Converter Replacement (2.4L) .
1Catalytic Converter Bracket Nut CAUTION: Refer to Fastener Caution . Tighten 50 N.m (37 lb ft)
2Exhaust Manifold Pipe Bracket Bolt Tighten 50 N.m (37 lb ft).
3Catalytic Converter Bracket Procedure Remove the catalytic converter fastener to brace. Remove the catalytic converter brace (2).
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Catalytic Converter Brace Replacement (2.4L)

Scheme 7

Scheme 7: Exhaust Muffler Replacement (Dual Exhaust-Left Side)
Scheme 7: Exhaust Muffler Replacement (Dual Exhaust-Left Side)
CalloutComponent Name
Preliminary Procedure Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
1Exhaust Muffler Nut (Qty: 2) WARNING: Refer to Hot Exhaust System Warning . CAUTION: Refer to Fastener Caution . Tighten 40 N.m (30 lb ft)
2Gasket
3Exhaust Insulator
4Left Rear Exhaust Muffler
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Exhaust Muffler Replacement (Dual Exhaust-Left Side)

Scheme 8

Scheme 8: Exhaust Muffler Replacement (Dual Exhaust-Right Side)
Scheme 8: Exhaust Muffler Replacement (Dual Exhaust-Right Side)
CalloutComponent Name
Preliminary Procedure Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
1Exhaust Muffler Nut (Qty: 2) WARNING: Refer to Hot Exhaust System Warning . CAUTION: Refer to Fastener Caution . Tighten 40 N.m (30 lb ft)
2Gasket
3Exhaust Insulator
4Left Rear Exhaust Muffler
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Exhaust Muffler Replacement (Dual Exhaust-Right Side)

Scheme 9

Scheme 9: Exhaust Muffler Replacement (Single Exhaust)
Scheme 9: Exhaust Muffler Replacement (Single Exhaust)
CalloutComponent Name
WARNING: Refer to Hot Exhaust System Warning . Preliminary Procedure Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
1Exhaust Front Pipe Nuts (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten 25 N.m (18 lb ft)
2Exhaust Isolators
3Gasket NOTE: Replace the gasket with a NEW gasket.
4Exhaust Muffler
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .
NOTE
Replace the gasket with a NEW gasket.

Exhaust Muffler Replacement (Single Exhaust)

Scheme 10

Scheme 10: Exhaust Resonator Replacement (With Dual Exhaust)
Scheme 10: Exhaust Resonator Replacement (With Dual Exhaust)
CalloutComponent Name
1WARNING: Refer to Hot Exhaust System Warning . Rear Muffler Nuts (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten 40 N.m (30 lb ft)
2Front Exhaust Nuts (Qty: 2) Tighten 30 N.m (22 lb ft)
3Gaskets TIP: Replace gaskets with NEW gaskets.
4Exhaust Resonator
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Exhaust Resonator Replacement (With Dual Exhaust)

Scheme 11

Scheme 11: Exhaust Resonator Replacement (NB5)
Scheme 11: Exhaust Resonator Replacement (NB5)
CalloutComponent Name
1WARNING: Refer to Hot Exhaust System Warning . Front Exhaust Nuts (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten 40 N.m (30 lb ft)
2Rear Muffler Nuts (Qty: 2) Tighten 40 N.m (30 lb ft)
3Gasket TIP: Replace gaskets with NEW gaskets.
4Exhaust Insulator Hanger
5Exhaust Muffler
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Exhaust Resonator Replacement (NB5)

Scheme 12

Scheme 12: Catalytic Converter Heat Shield Replacement (2.4L)
Scheme 12: Catalytic Converter Heat Shield Replacement (2.4L)
CalloutComponent Name
WARNING: Refer to Hot Exhaust System Warning . Preliminary Procedure Disconnect the heated oxygen sensor.
1Catalytic Converter Heat Shield Bolts (Qty: 3) CAUTION: Refer to Fastener Caution . Tighten 10 N.m (88 lb in)
2Catalytic Converter Heat Shield
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Catalytic Converter Heat Shield Replacement (2.4L)

Scheme 13

Scheme 13: Catalytic Converter Heat Shield Replacement (3.0L-Front)
Scheme 13: Catalytic Converter Heat Shield Replacement (3.0L-Front)
CalloutComponent Name
Preliminary Procedure Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle
1Catalytic Converter Heat Shield Nuts (Qty: 3) CAUTION: Refer to Fastener Caution . Tighten 22 N.m (16 lb ft)
2Catalytic Converter Heat Shield-Left
CAUTION
Refer to Fastener Caution .

Catalytic Converter Heat Shield Replacement (3.0L-Front)

Scheme 14

Scheme 14: Catalytic Converter Heat Shield Replacement (3.0L-Rear)
Scheme 14: Catalytic Converter Heat Shield Replacement (3.0L-Rear)
CalloutComponent Name
Preliminary Procedure Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle
1Catalytic Converter Heat Shield Nuts (Qty: 3) CAUTION: Refer to Fastener Caution . Tighten 22 (16 lb ft)
2Catalytic Converter Heat Shield-Right
CAUTION
Refer to Fastener Caution .

Catalytic Converter Heat Shield Replacement (3.0L-Rear)

Scheme 15

Scheme 15: Exhaust Heat Shield Replacement
Scheme 15: Exhaust Heat Shield Replacement
CalloutComponent Name
WARNING: Refer to Hot Exhaust System Warning . Preliminary Procedures Raise and Support the vehicle. Refer to Lifting and Jacking the Vehicle .
1Catalytic Converter Heat Shield Nut (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten 10 N.m (89 lb in)
2Catalytic Converter Heat Shield
3Exhaust Muffler Front Heat Shield Nut (Qty: 4) Tighten 22 N.m (16 lb ft)
4Exhaust Muffler Front Heat Shield
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Exhaust Heat Shield Replacement

Exhaust Manifold Heat Shield Replacement (2.4L)

CalloutComponent Name
WARNING: Refer to Hot Exhaust System Warning . Preliminary Procedure Disconnect the heated oxygen sensor.
1Catalytic Converter Heat Shield Bolts (Qty: 3) CAUTION: Refer to Fastener Caution . Tighten 10 N.m (88 lb in)
2Catalytic Converter Heat Shield
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Exhaust Manifold Heat Shield Replacement (2.4L)

Exhaust System Description

Note. Use of non-OEM parts may cause driveability concerns.

The exhaust system carries exhaust gases, treated by the catalytic converter, through a resonator, if applicable and into the exhaust muffler where exhaust noise is lessened.

In order to secure the exhaust pipe to the exhaust manifold, a flange and seal-joint coupling is utilized. The exhaust system may utilize a slip-joint coupling design with a clamp and a U-bolt or a flange connection with a gasket.

Exhaust hangers and rubber insulators help to support the weight of the exhaust pipe along with insulating any exhaust system vibration, rattle, or noise.

Exhaust hangers also space the exhaust system away from the underbody of the vehicle and allows the exhaust system to expand as the exhaust system warms up.

Exhaust heat shields are used to protect the body and other components from damage due to the heat from the exhaust system.

The exhaust system may be comprised of the following components

  1. Exhaust manifold
  2. Exhaust pipes
  3. Catalytic converters
  4. Exhaust muffler
  5. Exhaust resonator, if equipped
  6. Exhaust tail pipe, if equipped
  7. Exhaust hangers
  8. Exhaust heat shields

Resonator

Some exhaust systems are equipped with a resonator. The resonator, located either before or after the muffler, allows the use of mufflers with less back pressure. Resonators are used when vehicle characteristics require specific exhaust tuning.

Catalytic Converter

The catalytic converter is an emission control device used to reduce hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx) pollutants from the exhaust gas.

The catalytic converter is comprised of a ceramic monolith substrate, supported in insulation and housed within a sheet metal shell. The substrate may be washcoated with 3 noble metals

  1. Platium (Pt)
  2. Palladium (Pd)
  3. Rhodium (Rh)

The catalyst in the catalytic converter is not serviceable.

Muffler

The exhaust muffler reduces the noise levels of the engine exhaust by the use of tuning tubes. The tuning tubes create channels inside the exhaust muffler that lower the sound levels created by the combustion of the engine.

Special Tools

Illustration Tool Number/ Description EN 35314-A J 35314-A Exhaust Back Pressure Gauge

Scheme 16

Scheme 16: Special Tools
Scheme 16: Special Tools