GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2001 🢒 Chevrolet C-Series Medium Duty Truck B7 🢒 Engine 🢒 Engine Exhaust 🢒 Exhaust Seal Replacement

Removal Procedure

    Object Number: 665040 Size: SH
  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Disconnect the CPA retainer.
  3. Disconnect the oxygen sensor electrical connector.
  4. Support the catalytic converter or exhaust manifold pipe with adjustable jackstands.

    5. Object Number: 664826 Size: SH
  5. Remove the right exhaust manifold pipe nuts.

    6. Object Number: 309165 Size: SH
  6. Perform the following:
    7. • Remove the left exhaust manifold pipe nuts.
    • Remove the exhaust hanger mounting bracket bolts.
  7. Lower the catalytic converter or exhaust manifold pipe using the adjustable jackstands.
  8. Remove the exhaust manifold pipe seal(s).

Installation Procedure

    Object Number: 309165 Size: SH
  1. Install the exhaust manifold pipe seal(s).
  2. Raise the catalytic converter or exhaust manifold pipe using the adjustable jackstands.
  3. Perform the following:

    4. 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.

    • 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).


    Object Number: 664826 Size: SH
  4. Install the right exhaust manifold pipe nuts.

    5. Tighten
    Tighten the exhaust manifold pipe nuts to 50 N·m (39 lb ft).


    Object Number: 665040 Size: SH
  5. Perform the following:
    6. • Connect the oxygen sensor electrical connector.
    • Connect the CPA retainer.
  6. Remove the adjustable jackstands from catalytic converter or exhaust manifold pipe.
  7. Lower the vehicle.