ravenheat 820/20?

old boiler i know (should change, out of work) went very noisy this week , took off cover small fan on v.top of boiler rotted and broke away. well out with the super glue and need to make amends no funds at all , managed to glue back on but at a angle, so whole boiler really noisy and vibrates when in use, do i need this small fan , i know major fan in housing or can i cut off. i cant just replace tis bit as been told its factory fitted to major housing.Fan looks like electric fire bulb flicker fan , did not vibrate before glued back on , and its not catching apart from this boiler working but oh the noise. PLEASE HELP.