Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPONTIAC1998FIREBIRD V8-5.7L VIN GREPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTENGINESERVICE AND REPAIRENGINE OVERHAUL (UNIT REPAIR)REPAIR PROCEDURESENGINE BLOCK PLUG INSTALLATION
1998 Pontiac Firebird V8-5.7L VIN G
Engine Block Plug Installation
1998 Pontiac Firebird V8-5.7L VIN GSECTION Engine Block Plug Installation
ENGINE BLOCK PLUG INSTALLATION
^ Tools Required
- J41712 Oil Pressure Sensor Socket
IMPORTANT:
^ Engine block plug (oil gallery and coolant) sealing washers may be reused if not bent, scored or otherwise damaged.
^ Apply the proper amount and type of sealant to the sealing washer as recommended in the service procedure.
1. Apply a 3.175 mm (0.125 inch) bead of sealant GM P/N 12346004 or equivalent to the engine block coolant heater sealing washer (if applicable). Refer to Sealers, Adhesives, and Lubricants.
NOTICE: Refer to Fastener Notice in Service Precautions.
2. Install the engine block coolant heater to the engine block (if applicable).
^ Tighten the block coolant heater to 40 Nm (30 ft. lbs.).
3. Apply a 3.175 mm (0.125 inch) bead of sealant GM P/N 12346004 or equivalent to the engine block left front coolant drain plug sealing washer (if applicable).
4. Install the engine block left front coolant drain plug (if applicable).
^ Tighten the block left front coolant drain plug to 60 Nm (44 ft. lbs.).
5. Apply a 3.175 mm (0.125 inch) bead of sealant GM P/N 12346004 or equivalent to the engine block right rear coolant drain plug sealing washer.
6. Install the engine block right rear coolant drain plug.
^ Tighten the block right rear coolant drain plug to 60 Nm (44 ft. lbs.).
7. Apply a 3.175 mm (0.125 inch) bead of sealant GM P/N 12346004 or equivalent to the engine block left front oil gallery plug sealing washer.
8. Install the engine block left front oil gallery plug.
^ Tighten the block left front oil gallery plug to 60 Nm (44 ft. lbs.).
9. Apply a 3.175 mm (0.125 inch) bead of sealant GM P/N 12346004 or equivalent to the engine block left rear oil gallery plug sealing washer.
10. Install the engine block left rear oil gallery plug.
^ Tighten the block left rear oil gallery plug to 60 Nm (44 ft. lbs.).
11. Inspect the engine block rear oil gallery plug and O-ring seal. If the O-ring seal on the plug is not cut or damaged, the rear oil gallery plug may be reused.
12. Lubricate the O-ring seal with clean engine oil.
13. Install the block rear oil gallery plug into the oil gallery bore 0.8 - 1.4 mm (0.0315 - 0.055 inch) below flush.
IMPORTANT: The engine block front oil gallery plug should not be removed unless service is required.
14. Apply sealant GM P/N 12345382 or equivalent to the sides of the NEW front oil gallery plug.
15. Install a NEW engine block front oil gallery plug (if required). Install the front oil gallery plug into the oil gallery bore 2.2 - 2.8 mm (0.0086 - 0.011 inch) below flush.
16. Apply sealant GM P/N 12346004 or equivalent to the threads of the oil pressure sensor.
17. Use the J41712 or equivalent in order to install the oil pressure sensor.
^ Tighten the oil pressure sensor to 20 Nm (15 ft. lbs.).
^ Tools Required
- J41712 Oil Pressure Sensor Socket
IMPORTANT:
^ Engine block plug (oil gallery and coolant) sealing washers may be reused if not bent, scored or otherwise damaged.
^ Apply the proper amount and type of sealant to the sealing washer as recommended in the service procedure.
1. Apply a 3.175 mm (0.125 inch) bead of sealant GM P/N 12346004 or equivalent to the engine block coolant heater sealing washer (if applicable). Refer to Sealers, Adhesives, and Lubricants.
NOTICE: Refer to Fastener Notice in Service Precautions.
2. Install the engine block coolant heater to the engine block (if applicable).
^ Tighten the block coolant heater to 40 Nm (30 ft. lbs.).
3. Apply a 3.175 mm (0.125 inch) bead of sealant GM P/N 12346004 or equivalent to the engine block left front coolant drain plug sealing washer (if applicable).
4. Install the engine block left front coolant drain plug (if applicable).
^ Tighten the block left front coolant drain plug to 60 Nm (44 ft. lbs.).
5. Apply a 3.175 mm (0.125 inch) bead of sealant GM P/N 12346004 or equivalent to the engine block right rear coolant drain plug sealing washer.
6. Install the engine block right rear coolant drain plug.
^ Tighten the block right rear coolant drain plug to 60 Nm (44 ft. lbs.).
7. Apply a 3.175 mm (0.125 inch) bead of sealant GM P/N 12346004 or equivalent to the engine block left front oil gallery plug sealing washer.
8. Install the engine block left front oil gallery plug.
^ Tighten the block left front oil gallery plug to 60 Nm (44 ft. lbs.).
9. Apply a 3.175 mm (0.125 inch) bead of sealant GM P/N 12346004 or equivalent to the engine block left rear oil gallery plug sealing washer.
10. Install the engine block left rear oil gallery plug.
^ Tighten the block left rear oil gallery plug to 60 Nm (44 ft. lbs.).
11. Inspect the engine block rear oil gallery plug and O-ring seal. If the O-ring seal on the plug is not cut or damaged, the rear oil gallery plug may be reused.
12. Lubricate the O-ring seal with clean engine oil.
13. Install the block rear oil gallery plug into the oil gallery bore 0.8 - 1.4 mm (0.0315 - 0.055 inch) below flush.
IMPORTANT: The engine block front oil gallery plug should not be removed unless service is required.
14. Apply sealant GM P/N 12345382 or equivalent to the sides of the NEW front oil gallery plug.
15. Install a NEW engine block front oil gallery plug (if required). Install the front oil gallery plug into the oil gallery bore 2.2 - 2.8 mm (0.0086 - 0.011 inch) below flush.
16. Apply sealant GM P/N 12346004 or equivalent to the threads of the oil pressure sensor.
17. Use the J41712 or equivalent in order to install the oil pressure sensor.
^ Tighten the oil pressure sensor to 20 Nm (15 ft. lbs.).
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.