It is a 7 hour job at a shop and more is you had to do it. I will include a procedure for you.
Removal Procedure
Caution: Refer to Battery Disconnect Caution in Service Precautions.
Notice: Refer to Use GM Goodwrench DEX-COOL Coolant in Service Precautions.
Disconnect the negative battery cable.
Drain the coolant. Recover the coolant. Refer to Service and Repair.
Disconnect the electrical connectors.
Remove the exhaust manifold heat shield.
Remove the heat wrap from the heater hose.
Remove the coolant inlet housing bolt through the exhaust manifold.
Raise the vehicle. Refer to Vehicle Lifting.
Remove the exhaust manifold brace-to-manifold bolt.
Remove the manifold-to-exhaust pipe studs.
Remove the heater outlet pipe bracket-to-transmission bolt.
Remove the coolant inlet housing assembly to-water pump cover bolt.
Disconnect the exhaust pipe from the exhaust manifold.
Important: Do not rotate flex coupling more than 4 degrees as damage may occur.
Pull down and back on the exhaust manifold pipe in order to disengage the pipe from the exhaust manifold.
Disconnect the coolant inlet pipe from the oil pan. Remove the pipe.
Lower the vehicle.
Remove the brake vacuum pipe from the cam housing.
Remove the exhaust manifold to cylinder head retaining nuts.
Remove the exhaust manifold.
Remove the seals and the gaskets of the exhaust manifold.
Disconnect the heater hose quick connect from the heater outlet pipe.
Remove the front timing chain cover.
Remove the timing chain tensioner.
Remove the water pump cover-to-cylinder block bolts.
Remove the 3 water pump-to-timing chain housing nuts.
Remove the water pump and cover assembly.
Remove the water pump cover-to-coolant pump assembly bolts.
Clean all sealing surfaces.
Installation Procedure
Important: Before you install the coolant pump, read the entire procedure. Follow the tightening sequences in order to avoid part damage and to provide proper sealing.
Install the water pump cover to the water pump assembly.
Install the pump cover bolts. Hand tighten the bolts.
Install the cover-to-block bolts. Hand tighten the bolts.
Install the coolant pump-to-timing chain housing nuts. Hand tighten the nuts.
Lubricate the O-ring on the coolant inlet pipe with an antifreeze solution.
Slide the pipe into the water pump cover.
Install the bolts. Hand tighten the bolts.
Notice: Refer to Fastener Notice in Service Precautions.
Torque in sequence as follows:
8.1. Tighten the pump assembly-to-timing chain housing nuts.
Tighten nuts to 26 Nm (19 ft. Lbs.).
8.2. Tighten the pump cover-to-pump assembly bolts.
Tighten the bolts to 14 Nm (124 inch lbs.).
8.3. Tighten the coolant pump cover-to-engine block bolts. Tighten the bottom bolt first.
Tighten bolts to 26 Nm (19 ft. Lbs.).
8.4. Tighten the coolant inlet pipe assembly-to-coolant pump cover bolts.
Tighten the bolts to 14 Nm (124 inch lbs.).
Install the exhaust manifold and install new gaskets.
Install the exhaust manifold-to-cylinder head retaining nuts.
Connect the brake vacuum pipe to the cam housing.
Raise the vehicle. Refer to Vehicle Lifting.
Index the exhaust manifold bolts into the exhaust pipe flange.
Install the exhaust pipe to the exhaust manifold.
Install the heater outlet pipe bracket to the transmission.
Turn exhaust both bolts in evenly in order to avoid cocking the exhaust pipe and binding the bolts. Turn in the bolts until the bolts are fully seated.
Install the coolant inlet pipe to the oil pan.
Tighten nuts to 26 Nm (19 ft. Lbs.).
Install the timing chain tensioner.
Install the timing chain cover.
Lower the vehicle.
Install the exhaust manifold brace to the manifold bolt.
Install the manifold to the exhaust pipe nuts.
Install the heater hose to the heater pipe.
Inspect the quick connect retainer. Pull on the heater hose in order to verify the connection.
Install the upper heat shield to the exhaust manifold.
Connect the oxygen sensor connector.
Fill the radiator with coolant. Refer to Service and Repair.
Connect the negative battery cable.
Inspect the system for leaks.
Wednesday, July 29th, 2020 AT 5:58 PM
(Merged)