2008 Prius Hums at all speeds (VIDEO ATTACHED /// Wheel Bearings?)

Discussion in 'Gen 2 Prius Main Forum' started by MilkyWay, Sep 17, 2017.

  1. MilkyWay

    MilkyWay Active Member

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    ****Video on post 3****

    Just got it...really like it...came with shot tires and the next day put new tires (Ecopia 422 Plus).

    I do not remember if it had humming noise before but probably did.

    Doesn't change pitch/tone when you turn sharply or around bends. It is eerily similar to this thread (which turned out to be wheel bearings): Humming noise while driving | PriusChat

    At 20mph you can hear it.....At 70mph you can hear the front tires singing the same tune!

    Kinda sounds like you are hearing the gas motor running a little louder than usual. It is less noticeable with radio on.

    At first I just assumed they are all like that....and then after reading the similar thread posted above I am nearly certain it is wheel bearings. Probably both original on a 2008 145K miles prius.

    I can either spend:

    1) $203 for the pair at Auto Zone

    2) $58 free shipping from am-autoparts and they'd probably arrive Thursday (I've been saving tons of money using them lately). I don't care if they hum again in 10 months and I am sure they'll work fine.

    3) Not sure at dealership because they are closed today but probably outrageous

    My mechanic installs the set for $100 so if I go with option 2....total cost is $160.

    Might not be a bad idea to get professional diagnosis but the hum is loud and steady...so pretty obvious what it is (if it is not a normal prius noise).

    I am going to go with option 2 because $200 vs. $58 is just unacceptable!!!!! What a scam.
     
    #1 MilkyWay, Sep 17, 2017
    Last edited: Sep 17, 2017
  2. MilkyWay

    MilkyWay Active Member

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    May upload a YouTube video to see if sound comes through on my cell phone
     
  3. MilkyWay

    MilkyWay Active Member

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    Embarrassingly loud:


    Also get some wobbliness/unsafeness on freeway...hard to explain...Feels like it's gliding or dancing around or the tires are fighting each other maybe wobbliness is the word to describe what occasionally happens in freeway. Like you have to try really hard and firmly grip wheel to go straight or the tires in front dance

    EDIT: Could also be why tires were worn down to 2/32 on Belle Tire inspection. And I drove my wife's 2006 which has normal tire noise of tire spinning on pavement...but not nearly as loud and no constant humming. Must be bearings.
     
    #3 MilkyWay, Sep 17, 2017
    Last edited: Sep 17, 2017
  4. MilkyWay

    MilkyWay Active Member

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    Wheel bearings fixed loud hum. Regarding the job, it definitely wasn't easy. He started at 4:45pm and was on the road test-driving at 8pm. That included new pads/rotors.

    So about 3 and a half hours, but he had air tools and a torch. The front right took him about an hour, possibly even longer, not for entire job, but 1 hour just trying to remove the wheel bearing once all the bolts (except the final one holding it to steering knuckle) were already gone. It is rusted/glued completely shut. Hammering does nothing. He mostly tried hammering, heating it up, hammering more, using an air tool with some type of screw driver on it to pry it off...Just those 3 things over and over for a long time. I guess the trick he finally used was to heat up the entire area focusing on that last bolt that detaches the steering knuckle. It appeared too rusty to remove but he got it within 5-10 minutes once he focused in on that bolt.

    Then to the press machine to press out the bearing as it was totally glued in to the steering knuckle.

    I swear when it came to the 2nd go-around on the front left he had everything disassembled in 15 minutes.

    I watched and if you are a DIYer you are going to have a hell of a time, especially with hand tools. My guess 8 or 9 hours, most of the time swearing, scratching your head and wondering how to get the bearing to come out, and just staring at it in anger. Actually, now that I think of it, even if you detach bearing from the vehicle like he did, I'm not sure how you will get it out without a press machine.

    He really struggled on front right....I mean not that bad, but definitely wasn't a breeze, and then the front left (2nd bearing) was a joke to remove once he knew what to look for.
     
    #4 MilkyWay, Sep 20, 2017
    Last edited: Sep 20, 2017
  5. Jayw13702

    Jayw13702 Active Member

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    Ive done a wheel bearing in the past in my garage on a gen 2, what a nightmare!!!

    You also need a press in order to press the old bearing out.

    Would never do another one diy


    2010 Gen 3
     
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  6. JSB_99

    JSB_99 Member

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    I did both wheel bearings in my garage last weekend in just under 4 hours which included a few breaks using only hand tools and without removing the knuckles. The passenger side was the worst and took most of the time and came out in two different pieces. Once it was out you could see all of the rust in the knuckle that was holding it in. Drivers side took about 10 minutes once I got the caliper and rotor off. Used a combination of chisels, old large flat blade screwdrivers and a big heavy hammer and beat the crap out of it.
     
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  7. R-P

    R-P Active Member

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    This.
    I did both front sides (2 years apart or so), but both times went to the Toyota dealer to have the (remains of the) old bearing pressed out.
    First time I tried myself, tried at a local garage (who had a press, but we both decided to stop before breaking stuff) and ended up at the dealer (who has the correct size tools instead of making do with stuff lying around). Second time I went straight to the Toyota dealer.

    Damage in the race (?) of the bearing:
    [​IMG]

    Old and new bearing (with everything that comes attached to it, like the wheel studs)
    [​IMG]

    Sanding out the stainless-steel-to-aluminium crap before fitting the new bearing.
    [​IMG]
     
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  8. Lance DiBitetto

    Lance DiBitetto Junior Member

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    I replaced them on my '04 without pulling the spindle or CV axles, wasn't all that bad, I have done much more difficult repairs on cars in the past.
     
  9. ChapmanF

    ChapmanF Senior Member

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    One relatively pleasant approach is to carry the knuckles to your friendly neighborhood automotive machine shop, and leave your phone number for when they're ready to pick up. :)

    -Chap
     
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