Here's a general overview of the steps involved, but remember this is not a substitute for a proper repair manual:
1. Preparation:
* Safety First: Disconnect the negative battery terminal.
* Gather Tools and Parts: You'll need a complete set of metric sockets, wrenches, a torque wrench, valve spring compressor, lifter removal tool (often specialized), new valve lifters, gasket sealant (if needed), and a clean workspace.
* Consult Repair Manual: Locate the specific procedure for your engine. This will include torque specs, valve adjustment procedures (if applicable), and any special considerations.
2. Accessing the Engine:
* Remove necessary components: This usually involves removing parts like the intake manifold, valve covers, and possibly the timing chain cover (depending on the engine and lifter location). This process can be complex and require disconnecting various sensors, hoses, and wiring harnesses. The repair manual will provide a detailed sequence.
3. Removing the Valve Lifters:
* Remove the valve covers: Carefully remove the valve covers, noting the location and orientation of any gaskets or seals for proper reinstallation.
* Compress Valve Springs (If Necessary): Some lifter replacements may require compressing the valve springs to remove the rocker arms, giving you access to the lifters. This requires a valve spring compressor and is a delicate process – improper use can damage valve components.
* Remove Lifters: Using the appropriate lifter removal tool, carefully remove each lifter. They can sometimes be stubborn.
4. Installing the New Valve Lifters:
* Inspect the Lifter bores: Before installing the new lifters, inspect the lifter bores for any damage or debris. Clean them thoroughly if needed.
* Install new lifters: Carefully install the new lifters into their bores. Ensure they are seated correctly.
* Reinstall Rocker Arms (If Removed): Reinstall the rocker arms, ensuring they are properly seated and adjusted (if required).
5. Reassembly:
* Reinstall valve covers: Apply a new gasket (if needed) and carefully reinstall the valve covers, ensuring a proper seal. Torque the bolts to the specified values in the repair manual.
* Reinstall removed components: Reinstall all components that were removed in step 2, following the reverse order of disassembly. Pay close attention to proper alignment and connections.
6. Post-Installation:
* Check for leaks: After reassembly, check for any leaks around the valve covers or other components.
* Start the engine: Start the engine and let it run for a few minutes, listening for any unusual noises.
* Check oil level: Check the engine oil level and add oil if needed.
Important Considerations:
* Timing Chain/Belt: Working on the valve train can sometimes necessitate adjusting the timing chain or belt. This is a critical step and requires careful attention to detail. Improper timing can cause significant engine damage.
* Professional Help: If you're not comfortable with this level of mechanical work, it's strongly recommended to take your vehicle to a qualified mechanic. Improperly installed lifters can lead to serious engine damage.
This detailed overview is a simplification. Always refer to a repair manual specific to your Pontiac Grand Am's year, make, and engine. The repair manual will provide detailed instructions, diagrams, and torque specifications, crucial for a successful repair. Attempting this repair without the proper knowledge and tools could lead to engine damage and expensive repairs.
