Cenvat of excise duty

In our case we are taking excise number & purchase machinary cenvat taken on that machinery but 2 to 3 years that machine we are utilised for job work only after 3 years we are starting manufacturing goods can we are liable for utilised that capital goods cenvat againt the now manufacturing goods. is three in limitation for utilising cenvat credit (we are regular file excise return * carry forward cenvat next year)