engine noise?

have a w reg mondeo lx tdi 1.8...179000 miles fully serviced....ok up to last 2 week s and now getting alot of internal noise coming from under turbo area especially when increasing speed from 30 miles upwards.. a heavy constant base noise which then pulses..had someone change air filter and 2 seals on intercoooler yesterday and turbo working ok but noise still there...any help appreciated