Tools Needed:
1. Feeler gauge
2. Socket wrench
3. Set of wrenches
4. Screwdriver
5. Replacement valve shims (if necessary)
Procedure:
1. Preparation:
Allow the engine to cool down if it's been running. Locate the valve cover on top of the engine and remove it using the appropriate tools.
2. Find TDC (Top Dead Center):
Turn the crankshaft until the piston in cylinder #1 is at its uppermost point (TDC). This can be checked by aligning timing marks on the camshaft and crankshaft pulleys with the corresponding marks on the engine.
3. Locate Valve Adjustment Screws:
On the camshaft, you'll find adjustable valve lifters. These usually consist of a screw, locknut, and a shim underneath the screw.
4. Check Clearance:
Place a feeler gauge between the cam lobe and the valve stem on the first valve you want to adjust. Gently slide the gauge until you feel a slight drag but no binding. This determines the valve clearance.
5. Adjust Clearance (if Required):
If the valve clearance is out of specifications (typically around 0.008-0.012 inches for intake valves and 0.010-0.015 inches for exhaust valves), you'll need to adjust it.
6. Adjust Lock Nut and Shim:
Loosen the locknut on the valve adjustment screw and remove the shim. Replace it with a shim of the appropriate thickness to achieve the correct valve clearance.
7. Retighten Lock Nut:
Once you've installed the new shim, re-tighten the locknut.
8. Repeat for Other Valves:
Follow the same procedure to check and adjust the valve clearance for the other valves. Make sure to turn the crankshaft to align each piston at TDC before adjusting its corresponding valves.
9. Reinstall Cover:
Once you've completed the adjustments, reinstall the valve cover. Ensure that the gasket is properly seated and tighten the bolts to the specified torque.
Note:
Make sure to double-check your work and ensure the valve clearances are within factory specifications before starting the engine. If you're not comfortable performing this task, it's best to seek help from a qualified mechanic.
