1. Tools and Parts:
-Before starting, gather basic tools such as a socket set, wrenches, a feeler gauge, and an oil filter wrench. It is also recommended to replace the valve gasket and spark plugs during this process.
2. Preparing the Engine:
-Remove the valve covers on both cylinder heads. These are usually held in place by bolts or screws.
3. Setting the Engine to the Proper Position:
-Locate the number one cylinder by looking for the "TOP" or "1" mark on the harmonic balancer. Rotate the engine until the piston in the number one cylinder is at Top Dead Center (TDC) on the compression stroke. This can be verified by observing the valves for cylinder one - both should be closed.
4. Adjusting the Intake and Exhaust Valves:
-Use the feeler gauge to measure the clearance between the valve stem and the rocker arm. The clearance specifications are typically listed in your vehicle's service manual.
-Insert the feeler gauge between the valve stem and the rocker arm for the intake valves and exhaust valves. If the gap is too large or too small, adjust the rocker arm nut with the wrench until the correct gap is achieved.
-Tighten the rocker arm nut firmly but not excessively to avoid damaging the threads.
-Repeat steps 4 and 5 for all the intake and exhaust valves.
5. Re-checking and Reassembling:
-Once all the valves are adjusted, re-check the clearances to ensure they are still within specifications.
-Replace the valve covers and install new gaskets, torquing the bolts to the specified value.
-Replace the spark plus and oil filter if needed.
6. Starting the Engine:
-Once everything is reassembled, start the engine and let it run for a few minutes. Listen carefully for any unusual noise or vibrations. If any issues are detected, recheck the valve adjustments.
Note:
-Adjusting valves requires precision, so it is crucial to follow the steps mentioned carefully and adhere to the clearance specifications provided in your service manual. If you are unsure about any steps or lack mechanical experience, it is advisable to consult a qualified mechanic to perform the valve adjustment for you.
