How do you set valve pre load 1988 Ford Ranger?

To set the valve preload on a 1988 Ford Ranger, first ensure the engine is at top dead center (TDC) on the compression stroke for the cylinder you're adjusting. Then, loosen the rocker arm adjustment nut and turn the pushrod until there's a slight resistance, indicating the lifter is engaged. Tighten the adjustment nut to the specified torque, usually around 20-25 ft-lbs, while checking for any additional play and ensuring the pushrod can still rotate freely. Repeat this process for each cylinder as needed.