The utility model discloses a push rod spare and valve train for engine. Push rod spare can be including configuring the first part that holds hydraulic pressure clearance adjustment ware into and coupleing the second part of first part. First parts can be including the mating part that has toper tip section. The second part can be including being suitable for the admittance the first hole of the mating part of first part. The utility model discloses a part of push rod spare makes presses that to join in marriage the structure more firm. For example, disclosed push rod spare includes toper tip section and curved surface. When the mating part with first part and third part inserts first hole and the second hole of second part respectively for toper tip section makes the quilt in hole dig the material minimizing of falling, has consequently guaranteed firm pressure and has joined in marriage. In addition, downthehole smooth curved surface is showing reduction stress concentration to a distributing of stress of it is even is provided.