1. Locate the source of the ticking sound. Use a mechanic's stethoscope or a long screwdriver to narrow down the source of the ticking. If the sound seems to be coming from the valve cover, then it is likely caused by a loose or damaged valve cover gasket.
2. Replace the valve cover gasket. To do this, you will need to remove the valve cover, which can be done by removing the bolts that hold it in place. Once the valve cover is removed, you can inspect the gasket and replace it if necessary.
3. Check the valve clearances. If the valve clearances are not set properly, it can cause a ticking sound. You will need to use a feeler gauge to check the valve clearances and adjust them if necessary.
4. Inspect the valve train components. If the valve clearances are set properly and the valve cover gasket is not the cause of the ticking sound, then it is possible that the valve train components are damaged or worn out. You will need to remove the valve cover and inspect the components, including the camshaft, lifters, and pushrods. If you find any damage or wear, you will need to replace the affected components.
To replace the valve cover gasket:
1. Remove the valve cover bolts and remove the valve cover.
2. Remove the old valve cover gasket and clean the valve cover and the cylinder head mating surfaces.
3. Apply a thin bead of gasket sealant to the valve cover mating surface of the cylinder head.
4. Place the new valve cover gasket on the cylinder head and align the bolt holes.
5. Replace the valve cover bolts and tighten them to the specified torque.
6. Start the engine and run it for a few minutes to allow the gasket sealant to set.
