GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2006 🢒 Envoy - 4WD 🢒 Engine 🢒 Engine Exhaust 🢒 Exhaust Manifold Heat Shield Replacement

Removal Procedure

    Object Number: 754346 Size: SH
  1. Remove the air cleaner outlet resonator. Refer to Air Cleaner Outlet Resonator Replacement .
  2. Remove the transmission filler tube stud nut from the secondary air injection (AIR) adapter and move the filler out of the way.
  3. Remove the oil level indicator tube. Refer to Oil Level Indicator and Tube Replacement .
  4. Remove the oxygen sensor from the exhaust manifold. Refer to Heated Oxygen Sensor 1 Replacement .

    5. Object Number: 637629 Size: SH
  5. Remove the 4 manifold heat shield nuts and remove the heat shield.

Installation Procedure

    Object Number: 637629 Size: SH

    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.

  1. Install the exhaust manifold heat shield with the 4 nuts.

    2. Tighten
    Tighten the exhaust manifold heat shield nuts to 10 N·m (89 lb in).

  2. Install the oxygen sensor. Refer to Heated Oxygen Sensor 1 Replacement .
  3. Install the oil level indicator. Refer to Oil Level Indicator and Tube Replacement .
  4. Move the transmission filler tube back onto the stud and secure the tube with the nut.

    5. Tighten
    Tighten the transmission filler tube bracket nut to 10 N·m (89 lb in).

  5. Install the air cleaner outlet resonator. Refer to Air Cleaner Outlet Resonator Replacement .