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Technical Weird grinding noise???

Discussion in 'The Hokey Ass Message Board' started by VooDu52, Oct 12, 2021.

  1. spanners
    Joined: Feb 24, 2009
    Posts: 1,469

    spanners
    Member

    It might be the crazy in me but in these instances I put the rear end up on jack stands (HAMB approved cement blocks of course :D) so the rear is free to spin, start her up and run it till it makes the noise. I then slip it into neutral and kill the engine, allowing the rear end to keep rotating. That test takes the engine out of the equation.
     
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  2. ZZ Top Chop
    Joined: Aug 12, 2018
    Posts: 522

    ZZ Top Chop
    Member

    Following, my Merc does the same thing. As soon as you go off the gas, there's a faint grinding noise. I too have the Lokar Shifter, but it could be a coincidence. I always thought it could be pinion angle issue, but that was just my o-pinion. I'll let myself out.
     
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  3. If it was my car, I'd disassemble the U-joints despite the fact that they are supposed to be new.
     
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  4. Blue One
    Joined: Feb 6, 2010
    Posts: 11,256

    Blue One
    ALLIANCE MEMBER
    from Alberta

    While he’s at it he might as well disassemble the rest of the car maybe if he starts replacing parts at the front and ends up at the rear the noise will go away :D
     
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  5. Glenn Thoreson
    Joined: Aug 13, 2010
    Posts: 501

    Glenn Thoreson
    ALLIANCE MEMBER
    from SW Wyoming

    Probably way off base (and my rocker) but could you have a warped brake drum intermittently hitting the backing plate? Rotating things can expand and/or change shape at certain speeds. I also second the statement that SKF makes superior quality bearings. I still have my doubts about that driveshaft. Of late, Speedway products are somewhat suspect, in my opinion.
     
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  6. clem
    Joined: Dec 20, 2006
    Posts: 3,620

    clem
    Member

    Yea, like others have said, - disconnect the driveshaft and take it out for a test drive……………….
     
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  7. hotrodjack33
    Joined: Aug 19, 2019
    Posts: 3,447

    hotrodjack33
    ALLIANCE MEMBER

    Kinda rude for a FNG:mad:
     
  8. Blue One
    Joined: Feb 6, 2010
    Posts: 11,256

    Blue One
    ALLIANCE MEMBER
    from Alberta

    So, has the noise disappeared on its own?
     
  9. X-cpe
    Joined: Mar 9, 2018
    Posts: 1,401

    X-cpe

    It's a natural tendency to automatically eliminate new parts as a possible cause, but there is a reason they put warranties on things.
     
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  10. :D:D:D:D

    Ben
     
  11. Noisy Alternator's my guess, or water pump, power steering pump. Put a big screwdriver in your ear and start touching and listening. For all the old and dumb "Handle in your ear, tip on the engine". Thank You, love getting comments from "All Y'all" lets go.
     
    Last edited: Oct 20, 2021
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  12. Piewagn
    Joined: Mar 25, 2009
    Posts: 1,385

    Piewagn
    Member

    I had a similar issue.....drove me crazy. One day under my truck for a totally unrelated issue, I leaned on the exhaust to help myself up and voila....saw a crack open up on one of the exhaust hangers. Couldn’t see it with a visual inspection. Only at a certain speed when the resonance was right it would sound like a grinding noise.... Welded up the crack and my noise was gone! Hope you find your issue.....
     
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  13. Ebbsspeed
    Joined: Nov 11, 2005
    Posts: 5,770

    Ebbsspeed
    ALLIANCE MEMBER

    OUCH.
     
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  14. pitman
    Joined: May 14, 2006
    Posts: 5,151

    pitman

    er...HANDEL! :rolleyes:
    Or handle, of chosen dri--vair!
     
  15. Deuces
    Joined: Nov 3, 2009
    Posts: 21,945

    Deuces
    Member
    from Michigan

    Only the handle....;)
     
  16. Guy Patterson
    Joined: Nov 27, 2020
    Posts: 369

    Guy Patterson

    Hey just punch out both eardrums an you won't worry about the sound anymore
     
  17. Deuces
    Joined: Nov 3, 2009
    Posts: 21,945

    Deuces
    Member
    from Michigan

    :rolleyes:
     
  18. Glenn Thoreson
    Joined: Aug 13, 2010
    Posts: 501

    Glenn Thoreson
    ALLIANCE MEMBER
    from SW Wyoming

    Well, for what it's worth, there is only one thing left that I can think of. Ring and pinion bearing setup.
    Setting up a rear end is a delicate process and requires a lot of knowledge about gear mesh and pre-load torque specifications. Does your mechanic have adequate experience with this? I know for a fact that improper setup can cause exactly the problem you describe. I assume the pinion seal was replaced?
    If he didn't install the U joint flange properly it would change the settings and could cause damage.
    It's one of those things you don't just put the nut on and tighten it until the rattle wrench stops turning.
     
  19. As my mom was known to say . . .

    "Never stick anything in your ear except your elbow."
    :rolleyes:
     
    Deuces likes this.
  20. I've got this one figured out, the radio quit working!!!!! Get a new radio, and while you're at it, get some new boom boom speakers, viola! You'll never hear the grinding noise again!!
     
  21. gene-koning
    Joined: Oct 28, 2016
    Posts: 2,816

    gene-koning
    Member

    Volume! That new radio needs to have a lot of volume. You will need to be able to turn the radio up and the grinding noise gets louder!
     
    Deuces likes this.
  22. Ebbsspeed
    Joined: Nov 11, 2005
    Posts: 5,770

    Ebbsspeed
    ALLIANCE MEMBER

    Make sure the volume will go to eleven.

     
    Last edited: Oct 19, 2021
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  23. Cosmo49
    Joined: Jan 15, 2007
    Posts: 1,332

    Cosmo49
    Member

    The only thing that has me worried is a "junior hot rodder...." with an automatic transmission.
     
    Deuces likes this.
  24. I like to use a wooden dowel to "listen" for noises. If it gets sucked into the belts, it will break and not harm anything... at least in theory. Heater hoses or old garden hose is good too.
     
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