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Thread: Serpentine Belt Replacement

  1. #1
    Registered Member

    2007 CX-9 Sport

    Join Date
    Nov 2011

    Serpentine Belt Replacement

    On Saturday I tried to replace the serpentine belt on our 2007 CX-9 Sport but wasn't able to get the new one on. I was able to figure out that you have to take the right front tire off and remove a panel from the wheel well to gain access. I used a 13mm open ended wrench to move the idler pulley and the old one came right off. I tried for about two hours to get the new one on and there was no way it would go. What a horrible design. First, the bolt that holds the idler pulley to the torsion arm faces the engine block and there is not enough room to get a socket wrench in there. Second, the direction that you need to turn to relieve tension is also the direction to loosen the bolt that holds the idler pulley on( yes, mine did loosen but I was able to tighten it up enough to allow it to relieve tension without it coming loose again). Again, what a horrible design. I have never had a problem like this.

    I put the old one back on in about two minutes so I am guessing it has stretched enough to make it easy. The new one I'm putting on is a Dayco that I bought at Advance Auto and is about an 1/8" wider than the Motorcarft part that is on there now.

    Anyone have any advice on how to get the new one on? Thanks.

    Last edited by MikeJ; 11-09-2011 at 09:02 PM.

  2. #2
    Registered Member ceric's Avatar

    2016 Mazda6 iGT, 2014 Mazda3 sGT hatchback

    Join Date
    Jan 2008
    Northern California
    You are right about removal of wheel and shield.
    I just checked the WorkShop manual.
    I can scan you a copy if you send me a PM with an e-mail to send it to.
    2016 Mazda6 iGT + Tech Pkg
    ....Sonic Silver Mica / Parchment
    2014 Mazda3 sGT hatchback
    ....Soul Red Metallic / Almond

  3. #3
    Biggie T Skinny helbigtw's Avatar
    CX Moderator

    08 CX-9 GT Fwd, Bose/Nav, BSM,Compass/Homelink, Pwr Lift,Tow

    Join Date
    Feb 2011
    Lexington, KY
    Is it possible that the aftermarket is slightly smaller than the oem belt? I changed one on my V6 Passat (of course I remember having plenty of room for the wrench to loosen the idler pulley) but I don't think these belts really stretch over time...they just crack and get hard.

    08' CX-9 GT FWD
    Color: Gray Mica with Black Interior
    OEM Options: Nav/Bose/Sunroof/Bluetooth Phone/Rack&Crossbars/BSM/Pwr Lift/Homelink&Compass Mirror/Tow Pkg/All Weather Rear Mats
    Aftermarket: K&N drop-in filter/Centric E-Coated rotors & Centric Posi-Quiet Ceramics /Yakima ForkLift Bike Tray / Weathertech front mats
    Tires: Nitto NT850+ CUV
    Oil: Mobile One Full Synth 5w30
    Problems to date: Blower motor relays replaced once, intake manifold rear brace was missing from factory build, headlamp motors are dying
    Mileage: 91k March/16'
    Location: Lexington, KY
    Job: Auto Physical Damage Adjuster

    ... ... ...

  4. #4
    Registered Member

    2007 CX-9 Sport

    Join Date
    Nov 2011
    It is possible. I think I might bring it back and get one from the dealer.


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