GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2001 🢒 GMC C Sierra - 2WD 🢒 Engine 🢒 Engine Controls - 8.1L 🢒 Secondary Air Injection Crossover Pipe/Hose Replacement

Removal Procedure
  1. Remove shut-off outlet hose clamp at the crossover pipe.
  2. Remove the Bank 2 manifold pipe. Refer to Secondary Air Injection Check Valve Replacement - Bank 2 .

    3. Object Number: 470646 Size: SH
  3. Remove crossover pipe bracket fastener from cylinder head.
  4. Remove crossover pipe.

Installation Procedure

    Object Number: 470646 Size: SH
  1. Install crossover pipe.

    2. 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.

  2. Install crossover pipe bracket fastener to cylinder head.

    3. Tighten
    Tighten the fasteners to 50 N·m (37 lb ft).

  3. Install the Bank 2 manifold pipe. Refer to Secondary Air Injection Check Valve Replacement - Bank 2 .
  4. Install the shut-off outlet hose clamp at the crossover pipe.