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11-11-2021, 07:13 PM
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#1 |
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Registered User
Join Date: Jul 2021
Location: Marthasville, MO
Posts: 5
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Horrible whining sound under hood
This is on my 72 C20 I recently got. Last owner said it sat for 12 years. I cleaned the tank and lines, put new belts, charged battery. I got it running, and I have a weird sound.
I think one of the pulleys is bad, but it I never had a bad pulley sound like this before. It was very loud. I can't feel any play on the pulleys by hand. https://imgur.com/a/tvPV5E1 You may have to click unmute on the video, it does have sound. |
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11-11-2021, 07:17 PM
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#2 | |
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The Older Generation
   
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,344
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Re: Horrible whining sound under hood
Quote:
Bearings may be dried out in the alternator or water pump. LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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11-11-2021, 08:02 PM
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#3 |
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Registered User
Join Date: Oct 2004
Location: saskatoon, planet earth
Posts: 681
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Re: Horrible whining sound under hood
did you loosen the belts and try spinning some pulleys by hand?
__________________
I got a bench seat baby, you don't have to sit over there. |
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11-12-2021, 12:17 AM
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#4 | |
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Senior Member
Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,131
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Re: Horrible whining sound under hood
Quote:
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Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assm. guide "kit" for restoring it from ground up. With assys, the guide accts for 1000s details such as OEM identifications& part numbers, written in short order. 700+ images include assm, illust., charts, and points of interest. Much of the info. applies to all 67-72 GM trucks, and to a lessor degree all 67-72 GM vehicles. My build thread, and more on the guide https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
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11-11-2021, 09:05 PM
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#5 |
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20' Daredevil (Ret)
Join Date: May 2003
Location: Jefferson State
Posts: 13,517
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Re: Horrible whining sound under hood
If you don't have a mechanic's stethoscope, you can place the handle end of a long screwdriver against your temple, then touch the other end on various parts. Water pump, alternator, PS pump...... be careful you don't touch any moving parts like belts, pulleys, or the fan. Should be able to isolate the noise.
I have also read you can do the same with a few feet of vacuum hose, but I've never tried that.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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11-11-2021, 09:32 PM
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#6 |
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Registered User
Join Date: May 2016
Location: Henderson NC
Posts: 975
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Re: Horrible whining sound under hood
You can also take the belts off and run it for a minute. If the sound goes away you know it's not internal and is something running off the belts .
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11-12-2021, 12:10 AM
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#7 |
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Senior Member
Join Date: Jan 2009
Location: Tugaske SK Canada
Posts: 288
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Re: Horrible whining sound under hood
I had a horrible whining sound inside my cab the other day but it went away when I dropped the cluck off at the hairdressers.
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11-12-2021, 06:14 AM
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#8 | |
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Registered User
Join Date: Feb 2016
Location: Trenton,Ontario & South Carolina
Posts: 755
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Re: Horrible whining sound under hood
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11-12-2021, 07:56 AM
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#9 | |
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Registered User
Join Date: Oct 2020
Location: hebron, illinois
Posts: 139
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Re: Horrible whining sound under hood
Quote:
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11-12-2021, 09:49 AM
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#10 |
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Senior Member
 Join Date: Aug 2019
Location: Cheraw
Posts: 1,305
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Re: Horrible whining sound under hood
Do you have power steering? Could be low on oil.
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11-12-2021, 04:20 PM
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#11 |
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Registered User
Join Date: Apr 2011
Location: Fairview Park, Ohio
Posts: 1,031
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Re: Horrible whining sound under hood
Pretty easy to diagnose when it's that bad. like others already said, pull the belts and turn things by hand.
I'd bet a 12 pack of long necks it's water pump. RRM
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My build page http://67-72chevytrucks.com/vboard/s...d.php?t=764662 My cabinet building site http://www.cbcabinets.com |
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11-12-2021, 05:57 PM
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#12 |
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State of Confusion!
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,696
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Re: Horrible whining sound under hood
Have you tried a stethoscope (harbor freight has decent one cheap). Sure makes finding the noisy item quicker than throwing money at parts.
__________________
Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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