How do you set valve setting in 4d56 engine?

To set the valve clearance in a 4D56 engine, first, ensure the engine is at top dead center (TDC) on the compression stroke for the cylinder you're adjusting. Use a feeler gauge to measure the gap between the rocker arm and the valve stem. The typical clearance for the 4D56 engine is around 0.20 mm for intake and 0.25 mm for exhaust valves, but you should verify this against the specific service manual. Adjust the clearance by loosening the lock nut and turning the adjusting screw until the desired clearance is achieved, then re-tighten the lock nut.