Engine Block Plug Removal

Tools Required 

J 41712  Oil Pressure Switch Socket

Important:  Do not remove the engine block front oil gallery plug unless service is required.

If the front oil gallery plug is removed for service, a NEW oil gallery plug must be installed.

1. Use the J 41712  or equivalent in order to remove the oil pressure sensor, if not previously removed.
   Fig 1: Removing Oil Pressure Sensor

   Courtesy of GENERAL MOTORS CORP.
2. Remove the engine block right rear coolant plug.
   Fig 2: Removing Engine Block Right Rear Coolant Plug

   Courtesy of GENERAL MOTORS CORP.
3. Remove the engine block coolant heater, if applicable.
   Fig 3: Removing Engine Block Coolant Heater

   Courtesy of GENERAL MOTORS CORP.
4. Remove the engine block left front coolant plug, if applicable.
   Fig 4: Removing Engine Block Left Front Coolant Plug

   Courtesy of GENERAL MOTORS CORP.
5. Remove the engine block left front oil gallery plug.
   Fig 5: Removing Engine Block Left Front Oil Gallery Plug

   Courtesy of GENERAL MOTORS CORP.
6. Remove the engine block left rear oil gallery plug.
7. Inspect the block plug sealing washers.

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

   Fig 6: Removing Engine Block Left Rear Oil Gallery Plug

   Courtesy of GENERAL MOTORS CORP.
8. Remove the engine block rear oil gallery plug.
9. 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.

   Fig 7: Removing Engine Block Rear Oil Gallery Plug

   Courtesy 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.

10. Remove the engine block front oil gallery plug.
    Fig 8: Removing Engine Block Front Oil Gallery Plug

    Courtesy of GENERAL MOTORS CORP.