GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 TopKick C-Series (Conventional) C6/C7/C8 🢒 Engine 🢒 Engine Mechanical - 8.1L 🢒 Spark Plug Replacement

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

    2. Object Number: 470690 Size: SH
  2. Loosen each spark plug one or two turns.
  3. Brush or air blast away any dirt from around the spark plugs.
  4. Remove the spark plugs one at a time and place each plug in a tray marked with the corresponding cylinder numbers.

Installation Procedure

    Object Number: 470690 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. Install the spark plugs.

    4. Tighten

        • For IRON Head-all Subsequent Installations 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).
  4. Install the spark plug wires. Refer to Spark Plug Wire Replacement.