Tools Required

1. Remove the lower intake manifold. Refer to Lower Intake Manifold Replacement .
2. Remove the camshaft covers. Refer to Camshaft Cover Replacement - Left Side and Camshaft Cover Replacement - Right Side .
3. Drain the engine coolant. Refer to Cooling System Draining and Filling .
4. Remove the water outlet housing assembly.
5. Remove the drive belt tensioner. Refer to Drive Belt Tensioner Replacement .
6. Remove the water pump. Refer to Water Pump Replacement .
7. Remove the power steering pump and position aside. Refer to Power Steering Pump Replacement .
8. Remove the crankshaft balancer. Refer to Crankshaft Balancer Replacement .
9. Remove the camshaft position actuator valves from the front cover. Refer to Camshaft Position Sensor Replacement - Bank 2 (Left Side) Exhaust , Camshaft Position Sensor Replacement - Bank 2 (Left Side) Intake , Camshaft Position Sensor Replacement - Bank 1 (Right Side) Exhaust and Camshaft Position Sensor Replacement - Bank 1 (Right Side) Intake .
10. Remove the camshaft position actuator solenoid valves from the front cover. Refer to Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 1 (Right Side) Intake , Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 1 (Right Side) Exhaust , Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 2 (Left Side) Intake , and Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 2 (Left Side) Exhaust .
11. Remove the engine oil pan. Refer to Oil Pan Replacement .



12. Remove the engine front cover bolts.



13. Loosely install a 10 x 1.5 mm bolt in the "jackscrew" hole (1).
14. Using the pry points (2) located at the edge of the front cover and the "jackscrew", shear the RTV sealant.



15. Remove the engine front cover.



16. Using the EN 46111 , rotate the crankshaft until the left cylinder head camshafts align with the EN 46105-2 and the right cylinder head camshafts align with the EN 46105-1.



17. Install the EN 46105-1 to the right camshafts.



18. Install the EN 46105-2 to the left camshafts.

1. Install the 8 mm (0.315 in) guide from the EN 46109 into the cylinder block positions as shown.



2. Install the engine front cover to cylinder block seal.



3. Place a 3 mm (0.118 in) bead of RTV sealant, GM P/N 12378521 (Canadian P/N 88901148) or equivalent, on the engine front cover as shown (1).



4. Place the engine front cover onto the EN 46109 and slide into position.
5. Remove the EN 46109 from the cylinder block.



6. Hand start all the front cover bolts.

Notice: Refer to Fastener Notice in the Preface section.




7. Tighten the engine front cover bolts in the sequence shown.

Tighten
Tighten the engine front cover bolts in sequence to 23 N·m (17 lb ft).

8. Install the engine oil pan. Refer to Oil Pan Replacement .
9. Install the camshaft position actuator solenoid valves from the front cover. Refer to Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 1 (Right Side) Intake , Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 1 (Right Side) Exhaust , Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 2 (Left Side) Intake , and Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 2 (Left Side) Exhaust .
10. Install the camshaft position actuator valves from the front cover. Refer to Camshaft Position Sensor Replacement - Bank 2 (Left Side) Exhaust , Camshaft Position Sensor Replacement - Bank 2 (Left Side) Intake , Camshaft Position Sensor Replacement - Bank 1 (Right Side) Exhaust and Camshaft Position Sensor Replacement - Bank 1 (Right Side) Intake .
11. Install the crankshaft balancer. Refer to Crankshaft Balancer Replacement .
12. Install the power steering pump and position aside. Refer to Power Steering Pump Replacement .
13. Install the water pump. Refer to Water Pump Replacement .
14. Install the water outlet housing assembly.
15. Install the drive belt tensioner. Refer to Drive Belt Tensioner Replacement .
16. Install the camshaft covers. Refer to Camshaft Cover Replacement - Left Side and Camshaft Cover Replacement - Right Side .
17. Install the lower intake manifold. Refer to Lower Intake Manifold Replacement .
18. Refill the engine coolant. Refer to Cooling System Draining and Filling .

Special Tools

1. Remove the lower intake manifold. Refer to Lower Intake Manifold Replacement.
2. Remove the camshaft covers. Refer to Camshaft Cover Replacement - Left Side and Camshaft Cover Replacement - Right Side.
3. Drain the engine coolant. Refer to Cooling System Draining and Filling.
4. Remove the water outlet housing assembly.
5. Remove the drive belt tensioner. Refer to Drive Belt Tensioner Replacement.
6. Remove the water pump. Refer to Water Pump Replacement.
7. Remove the power steering pump and position aside. Refer to Power Steering Pump Replacement.
8. Remove the crankshaft balancer. Refer to Crankshaft Balancer Replacement.
9. Remove the camshaft position actuator valves from the front cover. Refer to Camshaft Position Sensor Replacement - Bank 2 (Left Side) Exhaust , Camshaft Position Sensor Replacement - Bank 2 (Left Side) Intake , Camshaft Position Sensor Replacement - Bank 1 (Right Side) Exhaust and Camshaft Position Sensor Replacement - Bank 1 (Right Side) Intake.
10. Remove the camshaft position actuator solenoid valves from the front cover. Refer to Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 1 (Right Side) Intake , Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 1 (Right Side) Exhaust , Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 2 (Left Side) Intake , and Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 2 (Left Side) Exhaust.
11. Remove the engine oil pan. Refer to Oil Pan Replacement.



12. Remove the engine front cover bolts.



13. Loosely install a 10 x 1.5 mm bolt in the "jackscrew" hole (1).
14. Using the pry points (2) located at the edge of the front cover and the "jackscrew", shear the RTV sealant.



15. Remove the engine front cover.



16. Using the EN 46111 , rotate the crankshaft until the left cylinder head camshafts align with the EN 46105-2 and the right cylinder head camshafts align with the EN 46105-1.



17. Install the EN 46105-1 to the right camshafts.



18. Install the EN 46105-2 to the left camshafts.

1. Install the 8 mm (0.315 in) guide from the EN 46109 into the cylinder block positions as shown.



2. Install the engine front cover to cylinder block seal.



3. Place a 3 mm (0.118 in) bead of RTV sealant, GM P/N 12378521 (Canadian P/N 88901148) or equivalent, on the engine front cover as shown (1).



4. Place the engine front cover onto the EN 46109 and slide into position.
5. Remove the EN 46109 from the cylinder block.



6. Hand start all the front cover bolts.

Caution: Refer to Fastener Caution in the Preface section.




7. Tighten the engine front cover bolts in the sequence shown to 23 N·m (17 lb ft).
8. Install the engine oil pan. Refer to Oil Pan Replacement.
9. Install the camshaft position actuator solenoid valves from the front cover. Refer to Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 1 (Right Side) Intake , Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 1 (Right Side) Exhaust , Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 2 (Left Side) Intake , and Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 2 (Left Side) Exhaust.
10. Install the camshaft position actuator valves from the front cover. Refer to Camshaft Position Sensor Replacement - Bank 2 (Left Side) Exhaust , Camshaft Position Sensor Replacement - Bank 2 (Left Side) Intake , Camshaft Position Sensor Replacement - Bank 1 (Right Side) Exhaust and Camshaft Position Sensor Replacement - Bank 1 (Right Side) Intake.
11. Install the crankshaft balancer. Refer to Crankshaft Balancer Replacement.
12. Install the power steering pump and position aside. Refer to Power Steering Pump Replacement.
13. Install the water pump. Refer to Water Pump Replacement.
14. Install the water outlet housing assembly.
15. Install the drive belt tensioner. Refer to Drive Belt Tensioner Replacement.
16. Install the camshaft covers. Refer to Camshaft Cover Replacement - Left Side and Camshaft Cover Replacement - Right Side.
17. Install the lower intake manifold. Refer to Lower Intake Manifold Replacement.
18. Refill the engine coolant. Refer to Cooling System Draining and Filling.