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Engine Exhaust System Cadillac SRX II

Exhaust 19 illustrations ~1101 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Catalytic Converter to the Cylinder Head46 N.m34 lb ft
Catalytic Converter to the Turbocharger (LAU)25 N.m18 lb ft
Catalytic Converter Brace to the Engine Block (LAU)20 N.m15 lb ft
Catalytic Converter Brace to the Catalytic Converter Outlet Flange (LAU)20 N.m15 lb ft
Catalytic Converter Bracket Nut (LAU)43 N.m32 lb ft
Catalytic Converter Support Bracket Bolt (LAU)22 N.m16 lb ft
Catalytic Converter Heat Shield Bolt (LAU)10 N.m7 lb ft
Catalytic Converter-Left to the Exhaust Muffler46 N.m34 lb ft
Catalytic Converter-Right to the Left Catalytic Converter Y-Pipe46 N.m34 lb ft
Catalytic Converter to the Front Flexible Pipe Nut (LAU)18 N.m13 lb ft
Catalytic Converter Upper Mounting Bracket Bolt (LAU)20 N.m15 lb ft
Exhaust Flexible Pipe Service Clamp48 N.m35 lb ft
Exhaust Manifold to Cylinder Head Bolt (LAU)20 N.m15 lb ft
Exhaust Manifold Lower Heat Shield Upper Bolt9 N.m80 lb in
Exhaust Manifold Lower Heat Shield Lower Bolt58 N.m43 lb ft
Exhaust Pipe Heat Shield Retainers1.5 N.m13 lb in
Exhaust Turbocharger Inlet Pipe to the Exhaust Manifold Nut (LAU)25 N.m18 lb ft
Exhaust Turbocharger Inlet Pipe to the Turbocharger Nut (LAU)25 N.m18 lb ft
Front Flex Pipe to Muffler Assembly Nut (LAU)46 N.m34 lb ft
Three-Way Catalytic Converter Service Clamp (LAU)54 N.m40 lb ft
Three-Way Catalytic Converter Service Clamp (LF1)48 N.m35 lb ft
Transmission Brace to Engine Block (MH4)58 N.m43 lb ft
Transmission Brace to Transmission (MH4)58 N.m43 lb ft
Transmission Heat Shield Bolt (LAU)10 N.m7 lb ft

Adhesives, Fluids, Lubricants, and Sealers

ApplicationType of MaterialGM Part Number
United StatesCanada
Anti-SeizeLubricant1237138689021945

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»(/cadillac/srx/ii-2009-2012/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»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__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»(/cadillac/srx/ii-2009-2012/remont/exhaust/#engine-exhaust-system)
  2. Poor acceleration Refer to «Restricted Exhaust»(/cadillac/srx/ii-2009-2012/remont/exhaust/#engine-exhaust-system)
  3. Poor fuel economy Refer to «Restricted Exhaust»(/cadillac/srx/ii-2009-2012/remont/exhaust/#engine-exhaust-system)
  4. Excessive smoke diesel Refer to «Restricted Exhaust»(/cadillac/srx/ii-2009-2012/remont/exhaust/#engine-exhaust-system)
  5. Exhaust hissing noise Refer to «Exhaust Leakage»(/cadillac/srx/ii-2009-2012/remont/exhaust/#engine-exhaust-system__exhaust-leakage)
  6. Exhaust popping noise Refer to «Exhaust Leakage»(/cadillac/srx/ii-2009-2012/remont/exhaust/#engine-exhaust-system__exhaust-leakage)
  7. Exhaust rattle noise Refer to «Exhaust Noise»(/cadillac/srx/ii-2009-2012/remont/exhaust/#engine-exhaust-system__exhaust-noise)
  8. Loud exhaust noise Refer to «Exhaust Noise»(/cadillac/srx/ii-2009-2012/remont/exhaust/#engine-exhaust-system__exhaust-noise)
  9. Exhaust buzz, groan, hum noise Refer to «Exhaust Noise»(/cadillac/srx/ii-2009-2012/remont/exhaust/#engine-exhaust-system__exhaust-noise)

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 EN 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 (LF1) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (LF1) . 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 EN 35314-A: gauge. Reinstall the HO2S sensor. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (LF1) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (LF1) . Remove the post-catalyst HO2S sensor. Refer to the appropriate procedure. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (LF1) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (LF1) . Install the EN 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: 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 (LF1) or Catalytic Converter Replacement - Right Side (LF1) . Did you find and correct the condition?Go to Step 8
8Remove the EN 35314-A: gauge. Reinstall the applicable HO2S sensor. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (LF1) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (LF1) . Clear any codes. Road test the vehicle in order to verify the repair. Did you correct the condition?System OKGo to Step 2

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 - Left Side (LF1) or Catalytic Converter Replacement - Right Side (LF1) .
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 (LF1) or Exhaust Muffler Replacement (LAU) .
WARNING
Refer to Hot Exhaust System Warning .

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 (LF1) or Exhaust Muffler Replacement (LAU) .
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 (LF1) or Exhaust Muffler Replacement (LAU) .
WARNING
Refer to Hot Exhaust System Warning .

Scheme 1

Scheme 1: Exhaust Manifold Replacement - Left Side (LAU)
Scheme 1: Exhaust Manifold Replacement - Left Side (LAU)
CalloutComponent Name
Preliminary Procedures Remove the secondary air injection pump pipe. Refer to Secondary Air Injection Pump Pipe Replacement . Remove the secondary air injection pump hose. Refer to Secondary Air Injection Pump Hose Replacement . Remove the left exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement - Left Side (LAU) . Remove the secondary air injection pipe bolts from the manifold. Refer to Secondary Air Injection Pipe Replacement . Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
1Nut (Qty: 7) WARNING: Refer to Hot Exhaust System Warning . CAUTION: Refer to Fastener Caution . Tighten: 20 N.m (15 lb ft)
2Gasket
3Exhaust Turbocharger Inlet Pipe Nuts Tighten: 20 N.m (15 lb ft)
4Exhaust Manifold Procedure Remove and discard the exhaust manifold gasket. Clean any exhaust manifold gasket debris from the cylinder head and exhaust manifold. Tighten the exhaust manifold nuts working from the center out.
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Scheme 2

Scheme 2: Exhaust Manifold Replacement - Right Side (LAU)
Scheme 2: Exhaust Manifold Replacement - Right Side (LAU)
CalloutComponent Name
Preliminary Procedures Remove the catalytic converter. Refer to Catalytic Converter Replacement (LAU) . Remove the right catalytic converter heat shield. Refer to Exhaust Manifold Heat Shield Replacement - Right Side (LAU) . Disconnect the exhaust turbocharger inlet pipe bank 2. Refer to Exhaust Turbocharger Inlet Pipe Replacement - Bank 2 (LAU) Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
1Nut (Qty: 7) WARNING: Refer to Hot Exhaust System Warning . CAUTION: Refer to Fastener Caution . Tighten: 20 N.m (15 lb ft)
2Gasket
3Exhaust Manifold Procedure Remove and discard the exhaust manifold gasket. Clean any exhaust manifold gasket debris from the cylinder head and exhaust manifold. Tighten the exhaust manifold nuts working from the center out.
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Scheme 3

Scheme 3: Exhaust Turbocharger Inlet Pipe Replacement - Bank 1 (LAU)
Scheme 3: Exhaust Turbocharger Inlet Pipe Replacement - Bank 1 (LAU)
CalloutComponent Name
Preliminary Procedures Remove the catalytic converter heat shield. Refer to Catalytic Converter Heat Shield Replacement (LAU) . Remove the catalytic converter. Refer to Catalytic Converter Replacement (LAU) . Remove the right exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement - Right Side (LAU) . Remove the transmission heat shield. Refer to Transmission Heat Shield Replacement (LAU) .
1Exhaust Turbocharger Inlet Pipe Bolt (Qty: 2) WARNING: Refer to Hot Exhaust System Warning . CAUTION: Refer to Fastener Caution . Tighten: 30 N.m (22 lb ft)
2Exhaust Turbocharger Inlet Pipe Bolt (Qty: 3) Tighten: 20 N.m (17 lb ft)
3Seal Tip: Replace the exhaust turbocharger inlet pipe seal.
4Exhaust Turbocharger Inlet Pipe
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Scheme 4

Scheme 4: Exhaust Turbocharger Inlet Pipe Replacement - Bank 2 (LAU)
Scheme 4: Exhaust Turbocharger Inlet Pipe Replacement - Bank 2 (LAU)
CalloutComponent Name
WARNING: Refer to Exhaust Service Warning Exhaust Service Warning. WARNING: Refer to Hot Exhaust System Warning . Preliminary procedures Remove the radiator outlet pipe. Refer to Radiator Outlet Pipe Replacement (LAU) . Remove the left side exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement - Left Side (LAU)
1Exhaust Turbocharger Inlet Pipe Nut (Qty 3) CAUTION: Refer to Fastener Caution . Tighten: 20 N.m (15 lb ft)
2Turbocharger Nut (Qty: 2) Tighten: 20 N.m (15 lb ft)
3Seal
4Exhaust Turbocharger Inlet Pipe - Bank 2
WARNING
Refer to Exhaust Service Warning Exhaust Service Warning.
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Scheme 5

Scheme 5: Catalytic Converter Replacement (LAU)
Scheme 5: Catalytic Converter Replacement (LAU)
CalloutComponent Name
Preliminary Procedures Remove the catalytic converter heat shield. Refer to Catalytic Converter Heat Shield Replacement (LAU) . Remove the transmission heat shield. Refer to Transmission Heat Shield Replacement (LAU) Remove the master cylinder heat shield. Remove the oxygen sensors. Refer to Heated Oxygen Sensor Replacement - Sensor 1 (LAU) and Heated Oxygen Sensor Replacement - Sensor 2 (LAU) . Remove the exhaust flexible pipe. Refer to Exhaust Flexible Pipe Replacement (LF1- Service) or Exhaust Flexible Pipe Replacement (LAU) .
1Catalytic Converter Nut (Qty: 3) WARNING: Refer to Hot Exhaust System Warning . CAUTION: Refer to Fastener Caution . Tighten: 25 N.m (18 lb ft)
2Catalytic Converter Support Bolt Tighten: 22 N.m (16 lb ft)
3Catalytic Converter Brace Nut (Qty: 2) Tighten: 20 N.m (15 lb ft)
4Catalytic Brace-to-Block Bolt (Qty: 2) Tighten: 22 N.m (16 lb ft)
5Catalytic Converter Procedure: Apply lubricant to the turbocharger stud bolts. Refer to Adhesives, Fluids, Lubricants, and Sealers . Torque the catalytic converter bolts in the following sequence: Tighten: Tighten "1" to 15 N.m (11 lb ft). Turn 270° counterclockwise. Tighten "2" to 15 N.m (11 lb ft). Turn 270° counterclockwise. Tighten "3" to 20 N.m (15 lb ft). Tighten "1" to 25 N.m (18 lb ft). Tighten "2" to 25 N.m (18 lb ft). Tighten the catalytic bracket bolts (4). Tighten: 20 N.m (15 lb ft) Tighten the catalytic bracket bolts (3). Tighten: 20 N.m (15 lb ft) Tighten the catalytic support bolt (2). Tighten: 22 N.m (16 lb ft)
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Removal Procedure

WARNINGRefer to Hot Exhaust System Warning .
WARNINGRefer to Safety Glasses Warning .
  1. Disconnect the heated oxygen sensor before and after the left catalytic converter.
  2. Remove the left catalytic converter nuts (1) to left cylinder head. Replace gasket (2) with a new one.
  3. Remove the nuts (1) to the rear muffler assembly.
  4. Remove the nuts (2) from the right catalytic converter.
  5. Remove the exhaust bracket insulator (3) from the hanger and lower catalytic converter (5).
  6. Carefully lower the catalytic converter to the floor.
  7. Transfer oxygen sensors if replacing catalytic converter.

Installation Procedure

  1. Install the left catalytic converter nuts to the left cylinder head. Tighten nuts (1) in a criss-cross pattern. Tighten: First Pass: 20 N.m (15 lb ft) Final Pass: 46 N.m (34 lb ft)
  2. Attach left catalytic converter to insulator hanger bracket (3).
  3. Install the left catalytic converter nuts (1) to the rear muffler assembly. Tighten to 46 N.m (34 lb ft).
  4. Install nuts (2) to the right catalytic converter. Tighten to 46 N.m (34 lb ft).
  5. Connect the heated oxygen sensor.
  6. Inspect the exhaust system for leaks.

Scheme 6

Scheme 6: Catalytic Converter Replacement - Right Side (LF1)
Scheme 6: Catalytic Converter Replacement - Right Side (LF1)
CalloutComponent Name
Preliminary Procedure Remove the left side catalytic converter. Refer to Catalytic Converter Replacement - Left Side (LF1) Disconnect the heated oxygen sensors before and after the right catalytic converter.
1Nut (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 Remove the right exhaust manifold nuts (1). Remove the right exhaust manifold studs on the right cylinder head (if necessary). Replace the nuts (1) and gasket (2). 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
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.

Scheme 7

Scheme 7: Three-Way Catalytic Converter Replacement (Service)
Scheme 7: Three-Way Catalytic Converter Replacement (Service)
CalloutComponent Name
WARNING: Refer to Exhaust Service Warning . CAUTION: Refer to Three-Way Catalytic Converter Damage Caution . Preliminary Procedure Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Cut the three-way catalytic converter 13.55 mm (0.5 inch) from the weld spot (a).
1Service Clamp
2Nut (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten: 48 N.m (35 lb ft)
3Three-Way Catalytic Converter
4Exhaust Muffler
WARNING
Refer to Exhaust Service Warning .
CAUTION
Refer to Fastener Caution .

Scheme 8

Scheme 8: Catalytic Converter Brace Replacement (LAU)
Scheme 8: Catalytic Converter Brace Replacement (LAU)
CalloutComponent Name
Preliminary Procedures Remove the catalytic converter heat shield. Refer to Catalytic Converter Heat Shield Replacement (LAU) . Remove the catalytic converter. Refer to Catalytic Converter Replacement (LAU) .
1Catalytic Converter Brace Bolt (Qty: 2) WARNING: Refer to Hot Exhaust System Warning . CAUTION: Refer to Fastener Caution . Tighten: 20 N.m (17 lb ft)
2Catalytic Converter Brace Bolt (Qty: 2) Tighten: 20 N.m (17 lb ft)
3Catalytic Converter Brace
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Scheme 9

Scheme 9: Exhaust System Insulator, Hanger, Bracket Replacement (Bracket - LAU)
Scheme 9: Exhaust System Insulator, Hanger, Bracket Replacement (Bracket - LAU)
CalloutComponent Name
Preliminary Procedures Remove the catalytic converter heat shield. Refer to Catalytic Converter Heat Shield Replacement (LAU) . Remove the catalytic converter. Refer to Catalytic Converter Replacement (LAU) .
1Catalytic Converter Bracket Nut WARNING: Refer to Hot Exhaust System Warning . CAUTION: Refer to Fastener Caution . Tighten: 43 N.m (32 lb ft)
2Catalytic Converter Bracket Bolt Tighten: 58 N.m (43 lb ft)
3Catalytic Converter Bracket
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Scheme 10

Scheme 10: Exhaust Muffler Replacement (LF1)
Scheme 10: Exhaust Muffler Replacement (LF1)
CalloutComponent Name
WARNING: Refer to Exhaust Service Warning . CAUTION: Refer to Exhaust System Inspection Caution . Preliminary Procedure: Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
1Nut (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten: 46 N.m (34 lb ft)
2Exhaust Muffler Insulator Tip: Use an appropriate tool to remove the muffler rods from the insulator. Inspect for worn, torn or damaged insulator, replace as necessary.
3Exhaust Muffler Tip: With the aide of an assistant, lower the muffler assembly.
WARNING
Refer to Exhaust Service Warning .
CAUTION
Refer to Fastener Caution .

Scheme 11

Scheme 11: Exhaust Muffler Replacement (LAU)
Scheme 11: Exhaust Muffler Replacement (LAU)
CalloutComponent Name
WARNING: Refer to Exhaust Service Warning . CAUTION: Refer to Exhaust System Inspection Caution . Preliminary Procedure: Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
1Nut (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten: 46 N.m (34 lb ft)
2Exhaust Muffler Insulator Tip: Use an appropriate tool to remove the muffler rods from the insulator, so as not to damage the insulator. Inspect for worn, torn or damaged insulator, replace as necessary.
3Exhaust Muffler Tip: With the aide of an assistant, lower the muffler assembly.
WARNING
Refer to Exhaust Service Warning .
CAUTION
Refer to Fastener Caution .

Scheme 12

Scheme 12: Exhaust Flexible Pipe Replacement (LF1- Service)
Scheme 12: Exhaust Flexible Pipe Replacement (LF1- Service)
CalloutComponent Name
Preliminary Procedure: Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
1Service Exhaust Clamp WARNING: Refer to Exhaust Service Warning . CAUTION: Refer to Fastener Caution . Procedure: Cut the exhaust flex pipe in the center of the straight pipe (a).
2Nut (Qty: 2) Tighten: 48 N.m (35 lb ft)
3Exhaust Flex Pipe (Y-Pipe)
4Exhaust Flex Pipe
WARNING
Refer to Exhaust Service Warning .
CAUTION
Refer to Fastener Caution .

Scheme 13

Scheme 13: Exhaust Flexible Pipe Replacement (LAU)
Scheme 13: Exhaust Flexible Pipe Replacement (LAU)
CalloutComponent Name
WARNING: Refer to Exhaust Service Warning . CAUTION: Refer to Exhaust System Inspection Caution . Preliminary Procedure: Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
1Nut (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten: 46 N.m (34 lb ft)
2Nut (Qty: 3) Tighten: 18 N.m (13 lb ft)
3Exhaust Muffler Insulators Tip: Use an isolator tool to remove the flex pipe rods from the insulator. Inspect for worn, torn or damaged insulator, replace as necessary.
4Seal Tip: Clean the gasket surfaces and replace any worn seals.
5Exhaust Front Flex Pipe
WARNING
Refer to Exhaust Service Warning .
CAUTION
Refer to Fastener Caution .

Scheme 14

Scheme 14: Catalytic Converter Heat Shield Replacement (LAU)
Scheme 14: Catalytic Converter Heat Shield Replacement (LAU)
CalloutComponent Name
Preliminary Procedure Remove the battery tray. Refer to Battery Tray Replacement . Remove the radiator surge tank engine hose at the surge tank. Refer to Radiator Surge Tank Engine Hose Replacement (LAU) . Remove the radiator surge tank inlet hose at the surge tank. Refer to Radiator Surge Tank Inlet Hose Replacement (LF1) or Radiator Surge Tank Inlet Hose Replacement (LAU) .
1Catalytic Converter Heat Shield Nut WARNING: Refer to Hot Exhaust System Warning . CAUTION: Refer to Fastener Caution . Tighten: 10 N.m (7 lb ft)
2Catalytic Converter Heat Shield Bolt (Qty: 3) Tighten: 10 N.m (7 lb ft)
3Catalytic Converter Heat Shield
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Scheme 15

Scheme 15: Transmission Heat Shield Replacement (LAU)
Scheme 15: Transmission Heat Shield Replacement (LAU)
CalloutComponent Name
Preliminary Procedure: Remove the catalytic converter heat shield. Refer to Catalytic Converter Heat Shield Replacement (LAU) .
1Transmission Heat Shield Nut WARNING: Refer to Hot Exhaust System Warning . CAUTION: Refer to Fastener Caution . Tighten: 10 N.m (7 lb ft)
2Transmission Heat Shield Bolt (Qty: 2) Tighten: 10 N.m (7 lb ft)
3Transmission Heat Shield
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Scheme 16

Scheme 16: Exhaust Manifold Lower Heat Shield (MH2, MH4, MXE)
Scheme 16: Exhaust Manifold Lower Heat Shield (MH2, MH4, MXE)
CalloutComponent Name
Preliminary Procedure: If equipped with AWD, remove the right catalytic converter. Refer to Catalytic Converter Replacement - Right Side (LF1)
1Transmission Brace Bolt (MH4) CAUTION: Refer to Exhaust Service Warning . CAUTION: Refer to Fastener Caution . Tighten: 58 N.m (43 lb ft)
2Transmission Brace Bolt (Qty: 2) Tighten: 58 N.m (43 lb ft)
3Transmission Brace (MH4)
4Lower Heat Shield Bolt Tighten: 9 N.m (80 lb in)
5Lower Heat Shield Bolt Tighten: 58 N.m (43 lb ft)
6Exhaust Manifold Lower Heat Shield (MH2 Shown)
CAUTION
Refer to Exhaust Service Warning .
CAUTION
Refer to Fastener Caution .

Scheme 17

Scheme 17: Exhaust Manifold Heat Shield Replacement - Right Side (LAU)
Scheme 17: Exhaust Manifold Heat Shield Replacement - Right Side (LAU)
CalloutComponent Name
Preliminary Procedures Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Remove the catalytic converter. Refer to Catalytic Converter Replacement (LAU) .
1Exhaust Manifold Heat Shield Bolt (Qty: 5) WARNING: Refer to Hot Exhaust System Warning . CAUTION: Refer to Fastener Caution . Tighten: 10 N.m (7 lb ft)
2Exhaust Manifold Heat Shield
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Scheme 18

Scheme 18: Exhaust Manifold Heat Shield Replacement - Left Side (LAU)
Scheme 18: Exhaust Manifold Heat Shield Replacement - Left Side (LAU)
CalloutComponent Name
Preliminary Procedures Remove the secondary air injection pump hose. Refer to Secondary Air Injection Pump Hose Replacement . Remove the secondary air injection pump pipe. Refer to Secondary Air Injection Pump Pipe Replacement . Remove the oil level indicator tube. Refer to Oil Level Indicator Tube Replacement (LF1) or Oil Level Indicator Tube Replacement (LAU) . Remove the harness bracket bolt above the exhaust manifold heat shield and reposition the engine harness.
1Exhaust Manifold Heat Shield Bolt (Qty: 4) WARNING: Refer to Hot Exhaust System Warning . CAUTION: Refer to Fastener Caution . Tighten: 10 N.m (7 lb ft)
2Exhaust Manifold Heat Shield
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

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. Platinum (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.

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

Scheme 19

Scheme 19: Special Tools
Scheme 19: Special Tools