Here's a general outline of the process. This is not a complete, step-by-step guide, and should not be considered a substitute for a proper repair manual. You will need a factory service manual specific to your 2001 Chevy Malibu 3.1L V6 (engine code J) for detailed instructions and torque specifications.
Tools You'll Need (at minimum):
* Factory Service Manual: Absolutely essential for torque specs, diagrams, and procedures.
* Socket Set: Various sizes, including metric.
* Wrench Set: Various sizes, including metric.
* Valve Lash Adjusting Tool: Specific feeler gauges for checking and adjusting the lash.
* Torque Wrench: Crucial for tightening components to the correct specification.
* Jack and Jack Stands: To safely lift and support the vehicle.
* Wheel Chocks: For safety.
* Rags or Shop Towels: To keep things clean.
* Safety Glasses: To protect your eyes.
General Procedure (Consult your service manual for precise details):
1. Safety First: Disconnect the negative battery terminal. Support the vehicle securely on jack stands.
2. Access the Valves: Remove the valve cover. This often requires removing various components like the air intake system and possibly other parts depending on your specific engine configuration. Your service manual will have detailed removal procedures.
3. Locate the Rocker Arms and Adjusters: Identify the rocker arms for each valve (intake and exhaust). The adjusting mechanism will vary; some engines use screw-type adjusters, while others might have different mechanisms. Your service manual will illustrate the specific adjuster type for your engine.
4. Determine Engine Timing: The crankshaft needs to be rotated to position the pistons at the appropriate top dead center (TDC) for each cylinder to correctly adjust the valves. This is crucial and the procedure is clearly explained in your service manual using the timing marks. You'll likely need to use a wrench on the crankshaft pulley to rotate the engine.
5. Check and Adjust Valve Lash: Using the appropriate feeler gauges specified in your service manual, check the valve lash for each valve (intake and exhaust). If it's outside the manufacturer's specified range (found in your service manual), adjust it using the adjusting screw (or appropriate mechanism). This usually involves loosening a lock nut, adjusting the screw to achieve the correct clearance, and then tightening the lock nut to the correct torque.
6. Repeat for All Valves: Follow the same procedure for every valve on both cylinder heads, ensuring the crankshaft is rotated to the correct position for each cylinder.
7. Reassemble: Carefully reinstall the valve cover, air intake, and any other components you removed. Tighten all bolts and nuts to the correct torque specifications (again, from your service manual).
8. Reconnect the Battery: Reconnect the negative battery terminal.
9. Start and Check: Start the engine and listen for any unusual noises. Check for leaks.
Important Considerations:
* Torque Specifications: Using the incorrect torque can damage engine components. Always refer to your service manual.
* Cylinder Firing Order: Knowing the firing order is essential for proper timing. It's in your service manual.
* Cleanliness: Keep everything clean to avoid damaging engine components.
* Double Check: Before starting the engine, double-check your work to ensure everything is correctly assembled and tightened.
Again, this is a simplified overview. A factory service manual is absolutely necessary for safe and correct valve lash adjustment. If you're not comfortable with this level of engine work, taking your car to a professional mechanic is the safest option. Improper valve lash adjustment can lead to engine damage.
