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Whistling (Dixie?)

Discussion in 'GM 6.5 Diesel Engines' started by smokymtn65, May 30, 2018.

  1. smokymtn65

    smokymtn65 Well-Known Member

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    Aug 21, 2015
    East TN
    Ok, taking guessing because I have not have a chance to isolate and find it. I think it is the alternator but about midway through our trip out west 4000+ miles we started getting a loud whistle sound. Like a loud turbo but on drivers side. Voltage is good and it comes and goes. We got home life had more important things, only drive occasionally so swapped alternator with another I have, (both(AZ rebuilds) lol I don't want to hear it! LOL Still has the whistle.. hmm both bad? My guess logic tell me the PS pump will whine not whistle.. Thoughts? I may know soon, sent my son to AZ to have the take off tested,
     
  2. MrMarty51

    MrMarty51 Well-Known Member

    1,286
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    Aug 1, 2017
    Miles City, Montana
    An air leak?
    My 99 has a slight whistle at low RPMs that varies until RPMs is around 1500 or so.
     
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  3. smokymtn65

    smokymtn65 Well-Known Member

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    Aug 21, 2015
    East TN
    Forgot to mention the "facts" on the 95 Burb
     
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  4. smokymtn65

    smokymtn65 Well-Known Member

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    Aug 21, 2015
    East TN
    Nothing Slight about this one... when it does it.
     
  5. Big T

    Big T Well-Known Member

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    Sep 25, 2009
    Fullerton, CA
    Check your idler pulley. When the bearing goes, it screams.
     
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  6. smokymtn65

    smokymtn65 Well-Known Member

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    Aug 21, 2015
    East TN
    @Big T Thanks, is it constant or intermittent?
     
    MrMarty51 likes this.
  7. WarWagon

    WarWagon Well it hits on 7 of 8...

    8,249
    2,691
    Nov 15, 2009
    AZ
    Pull belt and spin all pulleys. Vac Pump? Vac leak? Check to see if the rear bearing of the alt is grinding on the rear support bracket - aka is the paint gone there?

    If it's the alternator check batteries and IMO AZ alts Fing SUCK! They are NOT rebuilt just "patched", maybe. I let the smoke out of one AZ POS unit when the rear bearing failed. Determined the smoke was NOT outside and set the rear ABS off coming to a stop reaching for the fire extinguisher. It was smoking that bad! :eek: I don't shop AZ anymore for this and several other reasons some related to exciting complete failures of their below bottom of the barrel no-quality cheap parts. Cheap is the only market AZ is after. Can't trust their krap on a 550 mile daily trip let alone a 4000 mile trip as several other alts failed while delivering parts to them. Nevermind bad out of the box spares I used to carry.

    100_3065.jpg
     
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  8. Big T

    Big T Well-Known Member

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    Sep 25, 2009
    Fullerton, CA
    It would be constant. Easy to check. Simply grab pulley and see if there is play. Or remove belt and spin the pulley looking for play. The play will be obvious. Upon complete failure, you will lose the belt, AC power, power steering, etc. You will overheat quickly. No fun when on a steep mountain grade.
     
  9. smokymtn65

    smokymtn65 Well-Known Member

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    Aug 21, 2015
    East TN
    @WarWagon I knew it was coming from you!! LOL i bought the lift time before i ever joined first forum they are still replacing and as you can tell i have spares! I think they have replaced this one about 7 times. If these weren't so easy to change and I am not normally so far from home... BTW AZ couldn't make it whistle but the bearing was a bit "gravelly" And the guy working is a pretty good friend so I don't insult him. He takes pretty good care of me.
     
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  10. snarl95

    snarl95 Active Member

    351
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    Feb 22, 2014
    Edenton,NC
    Idler pulley.
     
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  11. smokymtn65

    smokymtn65 Well-Known Member

    315
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    Aug 21, 2015
    East TN
    @Big T and @snarl95
    Idler pulley was the problem, put new bearing in and that did it,

    Thanks
     
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  12. Big T

    Big T Well-Known Member

    3,515
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    Sep 25, 2009
    Fullerton, CA
    You know you got quality folks on this site when they can diagnose from afar and on first post :happy:
     
  13. smokymtn65

    smokymtn65 Well-Known Member

    315
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    Aug 21, 2015
    East TN
    Surprised you couldn't hear it! I popped the hood and asked my young to bring up the RPMs a bit and I just about went for cover!! LOL
     
  14. MrMarty51

    MrMarty51 Well-Known Member

    1,286
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    Aug 1, 2017
    Miles City, Montana
    That was a quick and easy fix.
    Things has to be extremely loud afore I can hear it. LOL Unless it is of a certain pitch and level.
     
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