Fastener Tightening Specifications
| Application | Specification |
|---|
| Metric | English |
| 3-Way Catalytic Converter to Front Pipe Nut | 50 N.m | 37 lb ft |
| 3-Way Catalytic Converter Nut | 20 N.m | 15 lb ft |
| 3-Way Catalytic Converter to Rear Muffler (Clamp) Nut | 40 N.m | 29 lb ft |
| Catalytic Converter to Cylinder Head (LFW) - First Pass Catalytic Converter to Cylinder Head (LFW) - Second Pass | 20 N.m | 15 lb ft |
| 46 N.m | 34 lb ft |
| Catalytic Converter Brace Nut/Bolt at Converter (LEA) | 50 N.m | 37 lb ft |
| Catalytic Converter Brace Nut/Bolt at Engine Block (LEA) | 50 N.m | 37 lb ft |
| Catalytic Converter-to- Exhaust Manifold Nut/Bolt (LEA) | 50 N.m | 37 lb ft |
| Catalytic Converter-to- Exhaust Front Flexible Pipe Nut | 52 N.m | 38 lb ft |
| Exhaust Front Flexible Pipe to 3-Way Catalytic Converter | 50 N.m | 37 lb ft |
| Catalytic Converter Heat Shield Bolt (LFW) | 22 N.m | 16 lb ft |
| Exhaust Manifold Nuts (LEA) | 14 N.m | 10 lb ft |
| Exhaust Manifold Heat Shield Bolt | 10 N.m | 89 lb in |
Fastener Tightening Specifications
Symptoms - Engine Exhaust
- 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/equinox/ii-2009-2015/remont/exhaust/#engine-exhaust-system__exhaust-system-description) .
- 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/equinox/ii-2009-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) .
Visual/Physical Inspection
- 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.
- Verify the exact operating conditions under which the concern exists. Note factors such as engine RPM, engine temperature, engine load, and frequency of concern.
- 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
- Loss of power Refer to «Restricted Exhaust»(/chevrolet/equinox/ii-2009-2015/remont/exhaust/#engine-exhaust-system__restricted-exhaust)
- Poor acceleration Refer to «Restricted Exhaust»(/chevrolet/equinox/ii-2009-2015/remont/exhaust/#engine-exhaust-system__restricted-exhaust)
- Poor fuel economy Refer to «Restricted Exhaust»(/chevrolet/equinox/ii-2009-2015/remont/exhaust/#engine-exhaust-system__restricted-exhaust)
- Excessive smoke diesel Refer to «Restricted Exhaust»(/chevrolet/equinox/ii-2009-2015/remont/exhaust/#engine-exhaust-system__restricted-exhaust)
- Exhaust rattle noise Refer to «Exhaust Noise»(/chevrolet/equinox/ii-2009-2015/remont/exhaust/#engine-exhaust-system__exhaust-noise)
- Loud exhaust noise Refer to «Exhaust Noise»(/chevrolet/equinox/ii-2009-2015/remont/exhaust/#engine-exhaust-system__exhaust-noise)
- Exhaust buzz, groan, hum noise Refer to «Exhaust Noise»(/chevrolet/equinox/ii-2009-2015/remont/exhaust/#engine-exhaust-system__exhaust-noise)
Restricted Exhaust
J-35314-A Exhaust Back Pressure Gauge
Diagnostic Aids
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.
- 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.
- 5 This step will isolate the catalytic converter from the remainder of the exhaust system.
- 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.
Exhaust Leakage
| Condition | Action |
|---|
| 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 components | Align 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 clamps | Tighten 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 connection | Replace the leaking seal or gasket. Refer to the affected components procedure for service. |
| Irregularities at the mating surfaces on the flange connections | Repair as required or replace the affected component. Refer to the affected components procedure for service. |
| Catalytic Converter cracked or broken | Replace the catalytic converter. Refer to Catalytic Converter Replacement - Left Side (LFW) , or Catalytic Converter Replacement - Right Side (LFW) . |
| Exhaust system component connection welds leaking | Replace the leaking component. Refer to the affected component's procedure for service. |
| Muffler or resonator, if equipped, damaged or leaking at the seams | Replace the affected muffler or resonator, if equipped. Refer to Exhaust Muffler Replacement . |
Exhaust Noise
| Condition | Action |
|---|
| 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 noise | Exhaust leak-Refer to Exhaust Leakage . |
| Loud exhaust | Compare 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 . |
| External rattle or vibration noise | Inspect 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 rattle | Test 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 . |
Scheme 1
Scheme 1: Exhaust Manifold Replacement (LEA)
Exhaust Manifold Replacement (LEA)
Scheme 2
Scheme 2: Catalytic Converter Replacement (LEA-FWD)
Catalytic Converter Replacement (LEA-FWD)
Catalytic Converter Replacement (LEA-AWD)
| NOTE |
|---|
| Replace with NEW gasket and seal. |
Catalytic Converter Replacement (LEA-AWD)
Scheme 3
Scheme 3: Catalytic Converter Replacement - Left Side (LFW)
| Callout | Component Name |
|---|
| WARNING: Refer to Hot Exhaust System Warning . Preliminary Procedure Remove the catalytic converter heat shield.Refer to Catalytic Converter Heat Shield Replacement (LFW) Remove the exhaust flexible pipe. Refer to Exhaust Flexible Pipe Replacement (LFW) . |
| 1 | Catalytic Converter Nuts (Qty: 4) CAUTION: Refer to Fastener Caution . CAUTION: To prevent damage to the exhaust manifold flange or stud, make sure the flange is fully seated before tightening. 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) |
| 2 | Gasket 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. |
| 3 | Catalytic Converter |
| CAUTION |
|---|
| To prevent damage to the exhaust manifold flange or stud, make sure the flange is fully seated before tightening. |
Catalytic Converter Replacement - Left Side (LFW)
Scheme 4
Scheme 4: Catalytic Converter Replacement - Right Side (LFW)
| Callout | Component Name |
|---|
| WARNING: Refer to Hot Exhaust System Warning . Preliminary Procedure Disconnect the oxygen sensor electrical connectors. Remove the catalytic converter heat shield.Refer to Catalytic Converter Heat Shield Replacement (LFW) Remove the exhaust flexible pipe. Refer to Exhaust Flexible Pipe Replacement (LFW) . |
| 1 | Catalytic Converter Nut (Qty: 4) CAUTION: Refer to Fastener Caution . CAUTION: To prevent damage to the exhaust manifold flange or stud, make sure the flange is fully seated before tightening. 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) |
| 2 | Gasket TIP: Improperly installed and/or leaking exhaust manifold gaskets may affect vehicle emissions and/or On-Board Diagnostics (OBD) II system performance. |
| 3 | Catalytic Converter TIP: If replacing catalytic converter, transfer both oxygen sensors. |
| CAUTION |
|---|
| To prevent damage to the exhaust manifold flange or stud, make sure the flange is fully seated before tightening. |
Catalytic Converter Replacement - Right Side (LFW)
Scheme 5
Scheme 5: Three-Way Catalytic Converter Replacement (LAF/LFW)
Three-Way Catalytic Converter Replacement (LAF/LFW)
Scheme 6
Scheme 6: Catalytic Converter Brace Replacement (LEA)
Catalytic Converter Brace Replacement (LEA)
Scheme 7
Scheme 7: Exhaust Muffler Replacement
| Callout | Component Name |
|---|
| Preliminary Procedure Raise and support the vehicle.Refer to Lifting and Jacking the Vehicle |
| 1 | Exhaust Muffler Clamp Fastener WARNING: Refer to Hot Exhaust System Warning . CAUTION: Refer to Fastener Caution . Tighten 40 N.m (30 lb ft). |
| 2 | Exhaust Insulator Hanger |
| 3 | Exhaust Muffler Procedure Disconnect the muffler from the front flexible pipe. Support the front flexible pipe to avoid damaging the flexible pipe. Clean and lubricate the exhaust insulator hangers. |
Exhaust Muffler Replacement
Scheme 8
Scheme 8: Exhaust Flexible Pipe Replacement (LFW)
| NOTE |
|---|
| Replace with NEW gaskets. |
Exhaust Flexible Pipe Replacement (LFW)
Scheme 9
Scheme 9: Catalytic Converter Heat Shield Replacement (LFW)
| Callout | Component Name |
|---|
| Preliminary Procedure Raise and support the vehicle.Refer to Lifting and Jacking the Vehicle |
| 1 | Catalytic Converter Nuts (Qty: 2) CAUTION: Refer to Fastener Caution . Procedure 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 22 N.m (16 lb ft). |
| 2 | Catalytic Converter Heat Shield-Left |
| 3 | Catalytic Converter Nuts (Qty: 2) CAUTION: Refer to Fastener Caution . Procedure 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 22 N.m (16 lb ft). |
| 4 | Catalytic Converter Heat Shield-Right |
Catalytic Converter Heat Shield Replacement (LFW)
Scheme 10
Scheme 10: Exhaust Manifold Heat Shield Replacement (LEA)
Exhaust Manifold Heat Shield Replacement (LEA)
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
- Exhaust manifold
- Exhaust pipes
- Catalytic converters
- Exhaust muffler
- Exhaust resonator, if equipped
- Exhaust tail pipe, if equipped
- Exhaust hangers
- 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
- Platium (Pt)
- Palladium (Pd)
- 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 J 35314-A Exhaust Back Pressure Gauge
Scheme 11
