GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2008 🢒 H3 🢒 Preface 🢒 Cautions and Notices 🢒 Exhaust Manifold Heat Shield Replacement

Exhaust Manifold Heat Shield Replacement LLR

Removal Procedure

Caution: Refer to Exhaust Service Caution in the Preface section.

Caution: Refer to Protective Goggles and Glove Caution in the Preface section.


    Object Number: 754346 Size: SH
  1. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  2. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .
  3. If equipped with an automatic transmission, remove the transmission filler tube bracket nut from the secondary air injection (AIR) adapter, and position aside.
  4. Remove the heated oxygen sensor (HO2S) from the exhaust manifold. Refer to Heated Oxygen Sensor 1 Replacement .

    5. Object Number: 858156 Size: SH
  5. Remove the nuts securing the heat shield to the exhaust manifold.
  6. Remove the exhaust manifold heat shield.

Installation Procedure

    Object Number: 858156 Size: SH
  1. Install the exhaust manifold heat shield to the exhaust manifold.
  2. Apply anti-seize GM P/N 12371386 (Canadian P/N 993128) to the exhaust manifold heat shield nuts.

    3. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the exhaust manifold heat shield nuts.

    4. Tighten
    Tighten the nuts to 10 N·m (89 lb in).

  4. Install the HO2S to the exhaust manifold. Refer to Heated Oxygen Sensor 1 Replacement .

    5. Object Number: 754346 Size: SH
  5. Position the automatic transmission filler tube to the AIR adapter if previously removed.
  6. Install the automatic transmission filler tube bracket nut.

    7. Tighten
    Tighten the nut to 12.5 N·m (111 lb in).

  7. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .
  8. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .