How do you adjust valves on a 1990 Jeep Comanche?

To adjust the valves on a 1990 Jeep Comanche, start by ensuring the engine is cold and remove the valve cover. Using a feeler gauge, check the clearance between the rocker arm and the valve stem for each cylinder, following the firing order. Adjust the valves by loosening the lock nut and turning the adjustment screw until the desired clearance is achieved, then tighten the lock nut. Repeat for each valve, then reinstall the valve cover and check for leaks.