How do you adjust valve clearance on Massey Ferguson 390?

To adjust the valve clearance on a Massey Ferguson 390, first, ensure the engine is cool and remove the valve cover. Rotate the engine to bring the piston of the cylinder you are adjusting to the top of its compression stroke (TDC). Using a feeler gauge, check the clearance between the rocker arm and the valve stem, adjusting as necessary by loosening the lock nut and turning the adjusting screw to achieve the specified clearance. Repeat this process for each cylinder, then reassemble and torque the valve cover properly.