Engine Block Plug Installation

WARNING: This page is about a different car, the 2003 GMC Envoy XL and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Tools Required

J 41712 Oil Pressure Switch Socket or equivalent

IMPORTANT:

Engine block plug, oil gallery and coolant, sealing washers may be used again 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.

Apply a 3.175 mm (0.125 in) bead of sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the engine block coolant heater sealing washer, if applicable. Refer to SEALERS, ADHESIVES, AND LUBRICANTS .

Fig 1: Installing Engine Block Plug
Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
Install the engine block coolant heater to the engine block, if applicable.
Tighten

Tighten the block coolant heater to 40 N.m (30 lb ft).
Apply a 3.175 mm (0.125 in) bead of sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the engine block left rear coolant drain plug sealing washer, if applicable.
Install the engine block left rear coolant drain plug, if applicable.
Tighten

Tighten the block left rear coolant drain plug to 60 N.m (44 lb ft).

Fig 2: Installing Engine Block Left Rear Coolant Drain Plug
Courtesy of GENERAL MOTORS CORP.
Apply a 3.175 mm (0.125 in) bead of sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the engine block right rear coolant drain plug sealing washer.
Install the engine block right rear coolant drain plug.
Tighten

Tighten the block right rear coolant drain plug to 60 N.m (44 lb ft).

Fig 3: Installing Engine Block Right Rear Coolant Drain Plug
Courtesy of GENERAL MOTORS CORP.
Apply a 3.175 mm (0.125 in) bead of sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the engine block left front oil gallery plug sealing washer.
Install the engine block left front oil gallery plug.
Tighten

Tighten the block left front oil gallery right plug to 60 N.m (44 lb ft).

Fig 4: Installing Engine Block Left Front Oil Gallery Plug
Courtesy of GENERAL MOTORS CORP.
Apply a 3.175 mm (0.125 in) bead of sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the engine block left rear oil gallery plug sealing washer.
Install the engine block left rear oil gallery plug.
Tighten

Tighten the block left rear oil gallery plug to 60 N.m (44 lb ft).

Fig 5: Installing Engine Block Left Rear Oil Gallery Plug
Courtesy of GENERAL MOTORS CORP.
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 used again.
Lubricate the O-ring seal with clean engine oil.
Install the block rear oil gallery plug into the oil gallery bore. A properly installed block plug will protrude 0.8-1.4 mm (0.0315-0.055 in) beyond the rear face of the block.

Fig 6: Installing Block Rear Oil Gallery Plug Into Oil Gallery Bore
Courtesy of GENERAL MOTORS CORP.

IMPORTANT: The engine block front oil gallery plug should not be removed unless service is required.
Apply sealant GM P/N 12345382 (Canadian P/N 10953489) or equivalent to the sides of the NEW front oil gallery plug.
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 in) below flush.

Fig 7: Installing Engine Block Front Oil Gallery Plug
Courtesy of GENERAL MOTORS CORP.
Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads of the oil pressure sensor.
Use the J 41712 or equivalent in order to install the oil pressure sensor.
Tighten

Tighten the oil pressure sensor to 20 N.m (15 lb ft).

Fig 8: Installing Oil Pressure Sensor Using Tool
Courtesy of GENERAL MOTORS CORP.