GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2009 🢒 H3 🢒 Engine 🢒 Engine Mechanical - 3.7L 🢒 Exhaust Manifold Installation

    Object Number: 858159 Size: SH
  1. Install the NEW exhaust manifold gasket.

    2. Object Number: 1875381 Size: SH
  2. Install the exhaust manifold.
  3. Add threadlock GM P/N 89021297 (Canadian P/N 10953488) to the exhaust manifold bolt threads.
  4. Install the exhaust manifold bolts.

    5. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1875410 Size: SH
  5. Tighten the exhaust manifold bolts.
    6. 5.1. Tighten the exhaust manifold bolts a first pass in sequence to 20 N·m (15 lb ft).
    5.2. Tighten the exhaust manifold bolts a second pass in sequence to 20 N·m (15 lb ft).
    5.3. Tighten the exhaust manifold bolts a final pass in sequence to 20 N·m (15 lb ft).

    Object Number: 1875380 Size: SH
  6. Install the exhaust manifold heat shield studs, if required. Tighten the exhaust manifold heat shield studs to 10 N·m (89 lb in).

    7. Object Number: 1875379 Size: SH
  7. Install the exhaust manifold heat shield.
  8. Add anti-seize GM P/N 12371386 (Canadian P/N 993128) to the exhaust manifold heat shield nuts.
  9. Install the exhaust manifold heat shield nuts. Tighten the exhaust manifold heat shield nuts to 10 N·m (89 lb in).