Diesel engine valve testing machine with replaceable cam

The invention discloses a diesel engine valve testing machine with a replaceable cam, which belongs to the technical field of diesel engine testing equipment, and realizes that testing cams with different shape parameters are uniformly mounted above a valve rod by the same equipment through a replacement structure of the testing cams, and the position of an erect head is fixed through a clamping piece. The convex surface orientation of the test cam is fixed through the elastic pin, the arc surface of the test cam is in contact with the end surface of the cam head by moving the shell frame, and the initial test position of the test cam is determined by positioning the test cam and the cam head and fixing the locking part. Driving tests of different test cams and air valves can be achieved only by replacing the test cams, correct positioning is completed when the test cams are installed through the supporting structures of the test cams, different test cam design and manufacturing special supporting structures