Gap adjusting tool

The utility model provides a clearance adjusting tool, which belongs to the technical field of nuclear power equipment debugging, is used for adjusting the distance between a rotating speed sensor and the bottom of a tooth groove of a main pump shaft, and comprises an adjusting piece and a connecting piece, the adjusting piece is used for being inserted between the rotating speed sensor and the tooth groove, the adjusting piece is provided with a first adjusting face and a second adjusting face which are arranged back to back, the distance between the first adjusting face and the second adjusting face is a preset distance, the first adjusting face is used for abutting against the rotating speed sensor, and the second adjusting face is used for abutting against the groove bottom of the tooth groove; the connecting piece is connected with the adjusting piece and can be used for holding. The technical problems that in the prior art, the process of adjusting the tooth groove bottom gap of the rotating speed senso