5. Operate the pump again to bring the pressure to 60 bars ( 860 psi ) Measure the new distance «m2», 6. a) Take the average of the two distances m3 —ml + m2 b) Measure «a» corresponds to the distance between line of the roller and the line of the slide valve and is obtainable by deducting from distance m3. - The half-diameter of the slide valve : a = 3,175 mm - Plus the half - diameter of the roller : ll 2 = 5,5 mm - That the whole 8,675 mm