Here's a general overview. Specific procedures might vary slightly depending on the year and modifications of your 302:
1. Preparation:
* Gather Tools: You'll need a socket set (including metric and SAE, depending on your engine's specifics), wrenches (open-end and box-end), valve adjustment tool (feeler gauges), a torque wrench, a breaker bar (potentially), a timing light (to verify timing chain hasn't slipped), shop rags, and a manual specific to your engine's year. A service manual is CRUCIAL for accurate specs and procedures.
* Safety First: Disconnect the negative battery terminal. Wear safety glasses. The engine should be cold.
* Access: Remove the valve covers to expose the rocker arms and valve adjustment screws/nuts.
2. Determine Valve Adjustment Method:
Ford 302s generally use either:
* Screws and Locknuts: These have a screw that adjusts the valve lash, and a locknut to secure the adjustment.
* Hydraulic Lifters: These self-adjusting lifters *generally* do not require manual adjustment. However, if you're experiencing valve train noise, investigate further. It might not be valve adjustment, but a failing lifter or other issue. A leak-down test might be needed to check for this.
3. Adjusting Valves (if needed - assuming screw and locknut type):
* Find Top Dead Center (TDC): Using the timing marks on the crankshaft pulley and harmonic balancer, rotate the engine to TDC on the compression stroke of the cylinder you're working on (your manual will show you how to identify the correct cylinder for the firing order). This ensures the valve is fully closed. Ensure the engine is rotated in the correct direction!
* Identify Intake and Exhaust Valves: Your manual will show you which rocker arms control intake and exhaust valves for each cylinder.
* Check Valve Lash: Using the appropriate feeler gauge thickness specified in your manual for both intake and exhaust valves for that cylinder, check the clearance between the rocker arm and the valve stem.
* Adjust Valve Lash: If the clearance is incorrect, loosen the locknut, adjust the screw until the correct feeler gauge slides with slight resistance, then tighten the locknut securely. Don't over-tighten! Your manual will specify the correct torque for the locknut.
* Rotate Engine: Rotate the engine to the next cylinder in the firing order, and repeat the process for all cylinders. Failure to do this in the correct sequence can result in incorrect adjustments.
4. After Adjustment:
* Reinstall Valve Covers: Torque valve cover bolts to the manufacturer's specifications.
* Reconnect Battery: Reconnect the negative battery terminal.
* Check for Leaks: After reassembly, check for oil leaks around the valve covers.
* Run Engine: Start the engine and listen for unusual noises.
Crucial Considerations:
* Engine Specifics: This is a general guide. The exact procedure and specifications (valve lash clearances, torque values) will vary depending on the year, model, and modifications of your specific Ford 302 engine. Consult your engine's service manual.
* Hydraulic Lifters: If your 302 uses hydraulic lifters, you typically don't need to adjust the valves. Noise could point to other issues requiring professional diagnosis.
* Professional Help: If you're uncomfortable with any part of this process, it's best to take your vehicle to a qualified mechanic. Incorrectly adjusted valves can cause serious engine damage.
This information is for general guidance only and should not be considered a substitute for a proper service manual and professional expertise. Always prioritize safety and consult reliable resources before attempting engine work.
