i have just purchased a very clean escort mk3 cabrioletits a 1.6i cvh but its making a tapping noise from rocker cover
i dont no very much about engines so all help is welcome i have checked oil its fresh and clean
car does not smoke at all and runs great but tapping noise is annoying me im only guessing but is there hydrolic lifters or tappets that need changing is this something i can do my self or am i on the wrong track???

thanx for any comments and advice