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  1. 01-08-2020 08:52 AM #1
    Marlon177
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    2016 CLA250 4Matic
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    Need Supercharger belt tensioner and idler torque spec

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    Will be replacing both supercharger belt tensioner and idler, but I can’t find the torque spec. Does anyone know? Thank you in advance.




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    Last edited by Marlon177; 01-22-2020 at 08:44 AM.
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  2. 01-08-2020 09:27 AM #2
    ellwood
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    idler is 42 N-m (31 ft-lbs) and tensioner is 40 N-m (30 ft-lbs)
    2021 M340i xDrive, 2016 Sepang SQ5, (sold) 2012 Glacier White S4 6MT - APR Stage II
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  3. 01-08-2020 09:40 AM #3
    MSq5
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    Quote Originally Posted by ellwood View Post
    idler is 42 N-m (31 ft-lbs) and tensioner is 40 N-m (30 ft-lbs)
    Above is correct, but, honestly, when I replaced the s/c tensioner, I just put a little blue Loctite on the threads and tightened it up nice and snug. This is not critical like cylinder head to block studs or main and rod bearing caps.
    2017 Q5 3.0T S-Line | Brilliant Black | 034 Stage 2+dual pulley 93 octane tune | JHM 187mm crank pulley w/ EPL 57.6mm s/c pulley - 3.247 total ratio | Red Star shielded test pipes | Magnaflow high flow downstream ceramic core bottle cats | Vibrant Ultra Quiet Resos in place of OEM baby resos | aFe Pro 5R (part#10-10121) filter in "modified" stock air box | 034 silicone throttle body hose | HP Tuners custom TCU tuned ZF8 | Merc Racing HX | Michelin Pilot Sport A/S 3+ 255/45/20.
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  4. 01-08-2020 11:46 AM #4
    Marlon177
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    2016 CLA250 4Matic
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    NY/South Jersey

    Quote Originally Posted by ellwood View Post
    idler is 42 N-m (31 ft-lbs) and tensioner is 40 N-m (30 ft-lbs)
    Quote Originally Posted by MSq5 View Post
    Above is correct, but, honestly, when I replaced the s/c tensioner, I just put a little blue Loctite on the threads and tightened it up nice and snug. This is not critical like cylinder head to block studs or main and rod bearing caps.
    Thank you so much for the info


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  5. 01-08-2020 01:38 PM #5
    viperbenz1
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    boston ma


    I just replaced it


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  6. 01-08-2020 01:42 PM #6
    Marlon177
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    Quote Originally Posted by viperbenz1 View Post

    I just replaced it


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    How long did it take u?


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  7. 01-08-2020 01:52 PM #7
    viperbenz1
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    Quote Originally Posted by Marlon177 View Post
    How long did it take u?


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    It took about 90minutes , most of it was taking the bumper cover and putting it back on


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