GM Service Manual Online
For 1990-2009 cars only

Engine Coolant Air Bleed Pipe and Hole Cover Installation LS3


    Object Number: 1552485  Size: SH

    Note:  Position the gasket O-ring seal (308) onto the nipple portion of the pipe.

  1. Install the seals onto the engine coolant air bleed pipe and covers.

  2. Object Number: 1559855  Size: SH
  3. Install the pipe (307) and gaskets (308).
  4. Notice: Refer to Fastener Notice in the Preface section.

  5. Install the bolts (309).
  6. Tighten
    Tighten the bolts to 12 N·m (106 lb in).


    Object Number: 1408862  Size: SH

    Note:  Production engines use a rivet-type plug at the top rear coolant passage of each cylinder head. If service of a leaking plug is required, it is necessary to remove the cylinder head from the engine to properly remove the plug prior to cover installation.

  7. Install the covers (313) and gaskets (308).
  8. Install the bolts (312).
  9. Tighten
    Tighten the cover bolts to 12 N·m (106 lb in).