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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 160 (Engine Mechanical - 4.8L, 5.3L, 6.0L And 6.2L (3 Of 5)) >> Off-Vehicle Repair Instructions (1 Of 3) >> Engine Block Plug Removal

Engine Block Plug Removal

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Engine Block Coolant Heater
    GM1552549Courtesy of GENERAL MOTORS CORP.
  1. Remove the engine block coolant heater (114) and seal (115).
    2. Fig 2: Identifying Plug Location On Underside Of Block
    GM63164Courtesy of GENERAL MOTORS CORP.
  2. Remove the engine block right rear coolant drain hole plug and seal.
    3. Fig 3: Engine Block Left Front Oil Gallery Plug & Seal
    GM1552550Courtesy of GENERAL MOTORS CORP.
  3. Remove the engine block left front oil gallery plug (116) and seal (117).
    4. Fig 4: Locating Engine Block Left Rear Oil Gallery Plug & Seal
    GM1552551Courtesy of GENERAL MOTORS CORP.
  4. Remove the engine block left rear oil gallery plug (112) and seal (113).

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

    5. Fig 5: Identifying Engine Block Rear Oil Gallery Plug & Seal
    GM1669843Courtesy of GENERAL MOTORS CORP.
  5. Remove the engine block rear oil gallery plug (111) and seal.
  6. Inspect the O-ring seal of the rear oil gallery plug.

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

    7. Fig 6: View Of Engine Block Front Oil Gallery Plug
    GM1552553Courtesy of GENERAL MOTORS CORP.
    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. Fig 7: Left Side Knock Sensor & Bolt
    GM1402136Courtesy of GENERAL MOTORS CORP.
  8. Remove the left side knock sensor (718) and bolt (739).
    9. Fig 8: Right Side Knock Sensor & Bolt
    GM1402140Courtesy of GENERAL MOTORS CORP.
  9. Remove the right side knock sensor (718) and bolt (739).
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