The present invention relates to a rotary jig for rotation of a crank shaft of a vehicle and a measuring system using the same. The measuring system includes: a rotary jig (100) for rotating a crank shaft (C) by opening only a bonnet in a vehicle stop state; a probe (700) joined to the position where a spark plug of an engine is separated and having an extension rod located at the center of a piston to check a top dead point and to output signal values when the crank shaft is rotated according to rotation of the rotary jig; a pump (810) for supplying air to a cylinder chamber of the engine through a tube connected to the probe (700) to move the piston; a terminal (900) for outputting the signal value of the probe (700) to a display unit through wireless communication; and a control unit (800) for controlling the signal values.
The measuring system can rotate the crank shaft after a worker opens only a bonnet and mounts the rotary jig at an end portion of the crank shaft when the crank shaft is rotated, thereby enabling the worker to simply measure an operational state of the engine linked with the crank shaft.