GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2008 🢒 Sierra - 4WD 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L 🢒 Engine Block Plug Removal

    Object Number: 1552549 Size: SH
  1. Remove the engine block coolant heater (114) and seal (115).

    2. Object Number: 63164 Size: SH
  2. Remove the engine block right rear coolant drain hole plug and seal.

    3. Object Number: 1552550 Size: SH
  3. Remove the engine block left front oil gallery plug (116) and seal (117).

    4. Object Number: 1552551 Size: SH
  4. Remove the engine block left rear oil gallery plug (112) and seal (113).

    5. If the block plug and coolant heater sealing washers are not damaged, they may be used during assembly.


    Object Number: 1669843 Size: SH
  5. Remove the engine block rear oil gallery plug (111) and seal.
  6. Inspect the O-ring seal of the rear oil gallery plug.

    7. If the O-ring seal is not cut or damaged, the plug and O-ring seal may be used during assembly.


    Object Number: 1552553 Size: SH

    Important: Remove the front oil gallery plug, only if service is required. If the front oil gallery plug is removed, a NEW oil gallery plug must be installed.

  7. Remove the engine block front oil gallery plug (101).

    8. Object Number: 1402136 Size: SH
  8. Remove the left side knock sensor (718) and bolt (739).

    9. Object Number: 1402140 Size: SH
  9. Remove the right side knock sensor (718) and bolt (739).