Method for measuring valve lift loss caused by hydraulic tappet

The invention provides a method for measuring valve lift loss caused by a hydraulic tappet, which comprises the following steps of: measuring the valve lift of an original hydraulic tappet through valve lift measuring equipment, obtaining the lift data of a valve through a displacement sensor, recording a displacement curve through an upper computer, and calculating the valve lift loss caused by the hydraulic tappet according to the displacement curve. An original hydraulic tappet is modified into a rigid tappet, after the valve lift of the rigid tappet is measured through valve lift measuring equipment, lift data of a valve are obtained through a displacement sensor, displacement curves are recorded through an upper computer, and the loss of the valve lift is obtained by comparing the two curves. According to the method for measuring the valve lift loss caused by the hydraulic tappet, the hydraulic tappet is replaced by the rigid tappet in situ during measurement, so that the measurement error is reduced to