The present invention has the purpose of allowing the control valve to be controlled remotely by using a hydraulic pressure by a simple switch operation outside the test room to adjust the intake air pressure during the engine test, so that the test work can be made in a safer and cleaner working condition. As a means for achieving this, the present invention is a test device for adjusting the intake pressure of the engine by the operation of a control valve equipped with air taken into the engine immediately after the air filter, the tank in which the oil is stored (1) And an oil pump (2) for pumping oil from the tank (1), a solenoid valve (3) for intermittent and controlling the supply of the pumped oil, a drive and solenoid valve of the oil pump ( Control switch box consisting of drive switch 4A and changeover switch 4B to control 3) outside the test room (4) and, while the oil flows into one side from the solenoid valve 3 and the oil flows out to the other side and is recovered to the tank 1, the piston rod 5B is drawn in and out on the one side, so that the piston rod 5B. A cylinder (5) for horizontally moving the rack gear (5C) formed at the end of the shaft, a pinion gear (6) rotating in engagement with the rack gear (5C), and coaxial with the pinion gear (6). It is characterized by being configured to consist of a control valve (7) that is arranged to open and close the intake pipe (12).
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