GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2009 🢒 H2 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L 🢒 Spark Plug Replacement

Removal Procedure
  1. Remove the spark plug wires. Refer to Spark Plug Wire Replacement.

    2. Object Number: 14824 Size: SH
  2. Loosen each spark plug 1 or 2 turns.
  3. Brush or air blast away any dirt from around the spark plugs.
  4. Remove the spark plugs 1 at a time. Place each plug in a tray marked with the corresponding cylinder numbers.

Installation Procedure

    Object Number: 14824 Size: SH
  1. Properly position each spark plug washer.
  2. Inspect each spark plug gap. Adjust each plug as needed.

    3. Specification
    Spark plug gap: 1.524 mm (0.060 in)

    Caution: Refer to Fastener Caution in the Preface section.

  3. Hand start the spark plugs in the corresponding cylinders.
  4. Tighten the spark plugs.

    5. Tighten

        • For used heads tighten the spark plugs to 15 N·m (11 lb ft).
        • For new aluminum heads tighten the spark plugs to 20 N·m (15 lb ft).
        • For new iron heads, tighten the spark plugs to 30 N·m (22 lb ft).
  5. Install the spark plug wires. Refer to Spark Plug Wire Replacement.