How to adjust the 16 valves of a 4G15 engine?
2 Answers
Prepare the tools needed to adjust the valves of the 4G15 engine. Generally, tools such as wrenches and screwdrivers are required. Use a wrench to loosen the adjustment screws of the 4G15 engine. Use a screwdriver to turn the screw shaft of the 4G15 engine and lift the screw shaft upward with your fingers. After determining the correct position, use the wrench to tighten the adjustment screws of the 4G15 engine. Tighten the clearance nut of the intake valve of the 4G15 engine, and the valve adjustment is complete.
Adjusting the valve clearance for the 16 valves of a 4G15 engine typically involves shim adjustment. First, ensure the engine is completely cooled to avoid measurement errors caused by thermal expansion. Remove the valve cover and locate each valve assembly, then use a feeler gauge to measure the intake and exhaust valve clearances—standard values are usually around 0.15mm, but it's best to confirm with the service manual. If the clearance is incorrect, carefully remove the old shim and replace it with a new one of the appropriate thickness. During adjustment, use a torque wrench to secure the bolts, avoiding overtightening that could cause damage. The entire process may require specialized tools, and without experience, it's easy to damage the valve train or cause abnormal noises. I recommend preparing gloves and a work light, taking time to inspect each cylinder carefully to avoid mistakes due to rushing. Regular adjustments help maintain engine quietness and smooth operation while extending its lifespan, but if you're unsure, it's safer to consult a professional. Remember, safety first—disconnect the battery before starting to prevent short circuits.
