Engine Block Plug Removal

Tools Required 

J 41712  Oil Pressure Switch Socket. See Special Tools .

Fig 1: Locating Knock Sensor & Retaining Bolt
Courtesy of GENERAL MOTORS CORP.
CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.
1. Remove the knock sensor retaining bolt (1).
2. Remove the knock sensor (2).
Fig 2: Removing Engine Oil Pressure Gage Sensor
Courtesy of GENERAL MOTORS CORP.
3. Remove the engine oil pressure gage sensor using the J 41712  . See Special Tools .
Fig 3: Removing Engine Oil Pressure Sensor Fitting
Courtesy of GENERAL MOTORS CORP.
4. Remove the engine oil pressure sensor fitting.
Fig 4: Removing Transmission Locator Dowel Straight Pins
Courtesy of GENERAL MOTORS CORP.
5. Remove the transmission locator dowel straight pins, if required.
Fig 5: Removing Engine Block Oil Gallery Plugs
Courtesy of GENERAL MOTORS CORP.
6. Remove the engine block left side oil gallery plug.
7. Remove the engine block left rear oil gallery plug.
8. Remove the engine block right rear oil gallery plug.
Fig 6: Removing Expansion Cup Plug From Camshaft Rear Bearing Hole
Courtesy of GENERAL MOTORS CORP.
9. Remove the expansion cup plug from the camshaft rear bearing hole and discard.
Fig 7: Removing Expansion Cup Plug From Balance Shaft Rear Bearing Hole
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10. Remove the expansion cup plug from the balance shaft rear bearing hole and discard.
Fig 8: Removing Crankshaft Rear Oil Seal Housing Locator Spring
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11. Remove the crankshaft rear oil seal housing locator spring type S pin, if required.
Fig 9: Removing Front Oil Gallery Plugs From Engine Block
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12. Remove the front oil gallery plugs or balls from the front of the engine block and discard.

    Insert a 3/8 x 26 inch rod into the rear oil gallery holes in order to drive out the front oil gallery plugs or balls.

Fig 10: Removing Engine Block Core Hole Plugs
Courtesy of GENERAL MOTORS CORP.
13. Remove the engine block core hole plugs.
    1. Use a suitable tool in order to drive the engine block core hole plugs into the coolant jacket.
    2. Use a suitable tool in order to pull the engine block core hole plugs from the coolant jacket.
    3. Discard the engine block core hole plugs.
Fig 11: Removing Oil Filter Bypass Valve
Courtesy of GENERAL MOTORS CORP.
14. Remove the oil filter bypass valve and discard.