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  1. #1
    Join Date
    Dec 2004
    Location
    Connecticut, US
    Posts
    274

    Default puzzled by this drive-train noise ...

    Hello all,

    My XC70 just started to make a noise like this when making turns: https://youtu.be/NKNn_-1nLEs. It happens on both left and right turns going forward or backward. I couldn't tell which side it comes from when I walk along with the car. When the car goes straight it would also make the same noise but with a much longer interval in between. I got under the car and see no leak from the boots - they look perfect. The noise doesn't really sound the same from a typical bad outer CV joint, so I'm really puzzled. Any idea what can cause such symptom? Thanks!

    DYZ

    EDIT - video link updated
    Last edited by DYZ; 07-02-2016 at 08:40 PM.
    2005 Volvo XC70, Ash Gold, 198K miles

  2. #2
    Join Date
    Apr 2003
    Location
    New England
    Posts
    399

    Default

    Please change the video to public from private.
    From your words I'm suspecting the bevel gear-
    14xc60 3.0T
    03xc70 (Killed 12/16)
    1998 v70 (retired)

  3. #3
    Join Date
    Dec 2004
    Location
    Connecticut, US
    Posts
    274

    Default

    Sorry about the video - it's my 1st youtube upload. Please check again, thanks!

    DYZ

    EDIT: this is the link: https://youtu.be/NKNn_-1nLEs
    Last edited by DYZ; 07-02-2016 at 08:38 PM.
    2005 Volvo XC70, Ash Gold, 198K miles

  4. #4
    Join Date
    Aug 2007
    Location
    NJ
    Posts
    621

    Default

    YIKES! Sounds like the bevel gear is shot.....could be the ujoint on the drive shaft as well
    2017 Maserati Ghibli - Blu Emozione, Black Leather 17k miles
    2013 Subaru Outback - charcoal Grey, Eyesight Collision Avoidance 110k miles
    2007 XC70, Barents Blue, Charcoal Leather 200k miles
    2001 Honda Accord V6 SE - 82k miles - Steady reliable transport
    1978 Bitchin' Chevrolet Z28 Camaro - Fuel Injected 383ci SB Dyno'd at 452HP 462FT/LBs Torque
    My build thread: http://www.nastyz28.com/forum/showthread.php?t=276139

  5. #5
    Join Date
    Dec 2004
    Location
    Connecticut, US
    Posts
    274

    Default

    Thanks guys. The noise heard in the video happens when the car is turning. It would stop when going straight. When going straight the same sound may come back just once after a long stretch (hundreds of feet). So whatever is broken reacts to the turn almost exclusively. Would bear gear or ujoint do that if they are broken? Thanks!

    DYZ
    2005 Volvo XC70, Ash Gold, 198K miles

  6. #6
    Join Date
    Dec 2004
    Location
    Connecticut, US
    Posts
    274

    Default

    8pack,

    I got the 4 corners of the car on stands and found the awd is not working. I think I'm going to do the bevel gear mod you invented So I guess I have to remove the prop shaft first (I already got the half shaft out on the passenger side). Those allen head screws in the front are not easy to get to, any tips on getting them off?

    DYZ
    2005 Volvo XC70, Ash Gold, 198K miles

  7. #7
    Join Date
    Apr 2003
    Location
    Devon PA
    Posts
    11,409

    Default

    Take some time, do it slowly
    Spray with some PB Blaster and let it soak in first
    All emails please use: jrl1194 (at) aol.com

    2007 V70 2.5T White/Oak, 112K miles. My daily driver and GORGEOUS
    2000 V70R wife's. Won't sell, now at 148K miles !! and still (almost) perfect.
    2000 S70 GLT SE with 29,000 miles!!! A time capsule, V70R front bumper, Volans, etc. SOLD!!! (I Will regret selling this!)

  8. #8
    Join Date
    Dec 2004
    Location
    Connecticut, US
    Posts
    274

    Default

    I now have a reasonable access to the allen head screws after removing a front member from where the catalyst hangs. Not sure how to put a counterhold while removing the screws. VIDA shows a special counterhold tool (9995743) that costs about $60. Anyone managed to get these screws out without buying this tool?

    DYZ
    2005 Volvo XC70, Ash Gold, 198K miles

  9. #9
    Join Date
    Dec 2004
    Location
    Connecticut, US
    Posts
    274

    Default

    OK. I got the allen head screws out. I also removed the two screws from the center. Now, how do I get it out? Do I pull it out from the rear or just drop it to the floor? Thanks!

    DYZ
    2005 Volvo XC70, Ash Gold, 198K miles

  10. #10
    Join Date
    Dec 2004
    Location
    Connecticut, US
    Posts
    274

    Default

    UPDADE: I made the car into FWD. From what I can see the sleeve is not stripped, but the angle gear side is worn. So, it seems to me the material for the sleeve is harder than earlier cars, causing the worn on the angle gear side. So replacing the sleeve is no longer an option.

    DYZ

    Click image for larger version. 

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    2005 Volvo XC70, Ash Gold, 198K miles

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