Characters: 1. Primary motor frequency changing speed 2. Large output torque, small fall speed value, high precision measurement 3. Ten kind of rotation speed presetting 4. Digital display of rotation speed, counting, temperature 5. Automatic control of fuel temperature 6. Positive and negative system with air resource 7. D.C. Supply 12V, 24V 8. Protection system of over pressure, over load, and over heat Functions: 1. Test fuel supply in every cylinder under different rotation speed 2. Test time of fuel supply in every cylinder 3. Test performance of mechanical speed governors 4. Test electromagnetic valve of distributor pumps 5. Test sealing of fuel injection pump 6. Test inner pressure and oil back pressure of distributor pump 7. Test performance of pressure compensators 8. Test performance of pneumatic speed governor 9. Test negative pressure performance of pneumatic film speed governor 10. Test performance of advance governor