Engine Block Plug Removal

Tools Required 

J 41712 Oil Pressure Switch Socket

Fig 1: Remove J 41712 Oil Pressure Sensor
Courtesy of GENERAL MOTORS CORP.
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 2: Identifying Plug Location On Underside Of Block
Courtesy of GENERAL MOTORS CORP.
2. Remove the engine block right side coolant drain hole plug.
Fig 3: View Of Engine Block Coolant Heater
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3. Remove the engine block coolant heater, if applicable.
Fig 4: View Of Engine Block Left Front Coolant Drain Hole Plug
Courtesy of GENERAL MOTORS CORP.
4. Remove the engine block left side coolant drain hole plug, if applicable.
Fig 5: Engine Block Left Front Oil Gallery Plug
Courtesy of GENERAL MOTORS CORP.
5. Remove the engine block left front oil gallery plug.
Fig 6: View Of Engine Block Left Rear Oil Gallery Plug
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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 7: View Of Engine Block 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 8: View Of Engine Block Front 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.