hydraulically actuated release mechanism may include a cylinder assembly 50 fig1 b illustrates a cylinder assembly 50 in accordance with embodiments described herein in some embodiments cylinder assembly 50 may be disposed laterally through body 40 or concentrically disposed within body 40 in certain embodiments cylinder assembly 50 may include a hydraulic cylinder 7 interfacing with seal rings and o rings for example seal split ring 8 seal ring 9 o ring 11 o ring backup 10 and o ring 12 in some embodiments seal rings may be formed of a material having substantial elasticity to span certain portions of body 40 in certain embodiments the hydraulic cylinder 7 may include an actuator piston or ram not shown slidably engaged with body 40 in some embodiments the shear screw 5 may be disposed laterally through the body 40 and engage the surface of body 40 in other embodiments hydraulic cylinder 7 may be pressurized using a ball drop method explained in detail below in certain embodiments premature release of the liner top packer setting adapter may be prevented because torsion is stored in cylinder assembly 50 and is not transmitted to the running nut 23 until the hydraulic mechanism is activated in other words cylinder assembly 50 may act to prevent premature release of liner top packer setting adapter from downhole tool.