Tools Required

1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
2. Drain cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
3. Remove the intake manifold. Refer to Intake Manifold Replacement .
4. Install the generator stud-ended bolt.
5. Remove the exhaust manifold. Refer to Exhaust Manifold Replacement in Engine Exhaust.
6. Install the J 28467-360 and J 28467-380 in order to support the engine.
7. Remove the ignition coil and the module assembly to the camshaft housing bolts. Remove the assembly by pulling it straight up. Refer to Ignition Control Module Replacement .
8. Disconnect the camshaft position sensor connector.
9. Remove the power steering pump. Refer to Power Steering Pump Replacement in Power Steering System.



10. Remove the fuel rail from the cylinder head. Refer to Fuel Injection Fuel Rail Assembly Replacement in Engine Controls.
11. Use the following procedure in order to remove the fuel rail from the cylinder head:
12. Disconnect the timing chain housing at the intake camshaft housing. Do not remove it from the vehicle. Refer to Timing Chain Housing Replacement .
13. Disconnect the electrical connection from the oil pressure switch.
14. Remove the intake camshaft housing. Refer to Intake Camshaft, Housing and Lifter Replacement .
15. Remove the exhaust camshaft housing. Refer to Exhaust Camshaft, Housing and Lifter Replacement .
16. Disconnect the radiator inlet (upper) hose from the coolant outlet. Refer to Radiator Hose Replacement in Engine Cooling.
17. Remove the coolant temperature sensor connectors.



18. Reverse the tightening sequence shown in order to remove the cylinder head to block bolts.



19. Remove cylinder head and gasket.

Notice: Engine damage may result if an abrasive paper, pad, or motorized wire brush is used to clean any engine gasket surfaces.

Important: 

•	Use a razor blade gasket scraper in order to clean the cylinder head and the cylinder block gasket surfaces. Do not gouge or scratch the gasket surfaces or the combustion chamber surfaces. Use a new razor blade for each cylinder head and the cylinder block.

•	Hold the gasket scraper so the blade is as parallel to the gasket surface as possible.

•	The feel of the gasket surface is important, not the appearance. There will be indentations from the gasket left in the cylinder head after all of the gasket material is removed. These small indentations will be filled in by the new gasket.

•	Do not use any other method or technique to clean the gasket surfaces.

•	Do not use a tap to clean the cylinder head bolt holes. Use a nylon bristle brush.

20. Clean the old sealer/lube and dirt from the bolt, the studs, and the bolt holes.

Clean the bolt holes with a nylon bristle brush.

Caution: Wear safety glasses when using compressed air in order to prevent eye injury.

21. When cleaning the cylinder head long bolt holes, use a suitable commercial spray liquid solvent and compressed air from an extended-tip blow gun in order to reach the bottom of the holes.
22. Clean the following components:

•	The cylinder head bolts.

•	The cylinder head

•	Remove all the varnish, the soot, and the carbon to the bare metal.

•	Do not use a wire brush on any gasket sealing surface.

•	The valve guides

•	The threaded holes

•	The remains of sealer from the plug holes

Important: 

•	Do not remove the spark plugs from an aluminum cylinder head until the cylinder head has cooled.

•	Clean the dirt and debris from the spark plug recess area.

•	If the spark plug opening threads are damaged and not restorable with a Thread Chaser, use the thread inserts in order to repair the threads.




23. Remove the spark plugs.
24. Inspect the cylinder head bolts for damaged threads or stretching and damaged heads caused by an improper use of tools.

Replace any suspected bolts.

25. Clean and inspect cylinder head. Refer to Cylinder Head Cleaning and Inspection .

1. If removed, install spark plugs.
2. Install cylinder head gasket.
3. Install cylinder head.



4. Install cylinder head bolts.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

Tighten

1. Tighten bolts 1 through 8 to 65 N·m (40 lb ft).
2. Tighten bolts 9 and 10 to 40 N·m (30 lb ft).
3. Then turn all bolts an additional 90 degrees in sequence, using the J 36660-A .
5. Connect coolant temperature sensor connector.
6. Install intake camshaft housing. Refer to Intake Camshaft, Housing and Lifter Replacement .
7. The exhaust camshaft housing. Refer to Exhaust Camshaft, Housing and Lifter Replacement .
8. Install the timing chain housing and the timing chain. Refer to Timing Chain Housing Replacement .



9. Install the fuel rail to the cylinder head. Refer to Fuel Injection Fuel Rail Assembly Replacement in Engine Controls.
10. Install the vacuum line to the fuel pressure regulator.
11. Install the camshaft position sensor connector.

Important: When reinstalling the power steering pump apply a 3 mm bead of GM P/N 12346586 sealer or the equivalent to the joint at the end of the camshaft housing halves before installation of the power steering pump and the pump face seal.




12. Install the power steering pump assembly. Refer to Power Steering Pump Replacement in Power Steering System.
13. Install the electrical connection from the oil pressure switch.
14. Reinstall any spark plug boot connector assembly that stuck to a spark plug back onto the ignition coil and module assembly.
15. Locate the ignition coil and the module assembly over the spark plugs and push straight down.
16. Clean any loose lubricant that is present on the ignition coil and the module assembly to the camshaft housing bolts.



17. Apply the Pipe Sealant GM P/N 1052080 or the equivalent onto the ignition coil and the module cover assembly to the camshaft housing bolts.

Tighten
Tighten the bolts to 15 N·m (11 lb ft) + 30 degrees.

18. Install the electrical connector to the ignition coil and the module assembly.
19. Remove the J 28467-360 and the stud-ended generator bolt.
20. Install the intake manifold. Refer to Intake Manifold Replacement .
21. Connect the coolant temperature sensor connectors.
22. Connect the upper radiator hose to the coolant outlet.
23. Connect the following electrical connectors:

•	The MAP sensor

•	The IAT sensor

•	The purge solenoid

•	The fuel injectors

24. Install the exhaust manifold. Refer to Exhaust Manifold Replacement in Engine Exhaust.
25. Install the resonator and air cleaner duct.
26. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
27. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.