Just chiming in to say -- we've had to replace three rattling case fans on
two older Isoprimes over the last 18 months - apparently they have a
consistent lifetime! With the first one I was very concerned about the
turbo, but I was able to vent the instrument while leaving the power on to
the fan, which confirmed that the fan was the source of the noise.

On Fri, Jan 6, 2017 at 8:01 AM, gerard olack <[log in to unmask]> wrote:

> HI All--
> Danny Rye likes to promote the old mechanic's trick--place a long rod
> (e.g. screwdriver) on the object of interest, and your ear on the other
> end.  It does help localize sources of sounds if you can catch it during  a
> rattle....
> The fans on our UPS's whine at a frequency of a turbo pump that's working
> too hard--very annoying.
> take care,
> gerry
> On 1/6/2017 8:16 AM, Kevin Dillon wrote:
> Neil,
> I would think the turbo would run hot if the fan completely failed which
> will surely shorten its life. You know how much a turbo costs. Our fan
> started whining last year-  we were also unsure if it was the turbo or the
> fan but once we pulled the fan it was obvious its bearings were on their
> way out. You could pull the side and blow air over the area with another
> fan until you get a replacement. We found the brand name and part# from the
> fan and ordered a few extras from an electronics vendor.
> Good Luck.
> Kevin
> ------------------------------
> *From:* Stable Isotope Geochemistry <[log in to unmask]>
> <[log in to unmask]> on behalf of NEIL OGLE <[log in to unmask]>
> <[log in to unmask]>
> *Sent:* Friday, January 6, 2017 6:28:04 AM
> *To:* [log in to unmask]
> *Subject:* [ISOGEOCHEM] Failing fan?
> All:
> Just wondering if anyone has had the fan inside a Delta V (top of the
> chimney, beside the turbo) fail.  I cant make up my mind if its the fan or
> turbo beginning to make periodic rattling noises.  If you've worked in a
> lab as long as I have you become attuned to background noise and are
> susceptible to these types of little changes!  As the machine was in hiatus
> over Christmas with needle valve closed, thought I'd take the opportunity
> to change the oil in the backing pump and run a hoover over the area.  Im
> leaning towards the fan as pre-shutdown vacuum was in the mid -8s  and as
> I've turned everything back on again, the vacuum is coming down as
> expected.  Ive also done the screwdriver to the ear trick and the pump
> noise is constant while the chimney seems to confirm my suspicions.  Anyway
> just seeking any other observations and if it was to fail, say over the
> weekend, how damaging could this be
> Neil
> Stable Isotope Facility
> School of Natural and Built Enviornment
> Queen's University Belfast
> Northern Ireland

Sara Peek
Physical Science Technician
Isotope Tracers Project

USGS Menlo Park
345 Middlefield Rd, MS 434
Menlo Park, CA 94025