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Thread: Belt Tension, Howto

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    Belt Tension, Howto

    According to the Mirage Service Manual, the correct belt tension is determined by its resonant tone.
    Just like a guitar string, the tone changes pitch according to tension. The dealer would use the MUT3 tool to measure it, and to get the tension right.

    Now, since I do not own a MUT3, here is a different way of doing it:

    Pluck the belt firmly where it runs under the engine mount, just as if it were a guitar or any other string instrument.
    See the picture for details.
    This produces a tone with a pitch proportional to its tension.
    Play the audio file for comparison, and adjust the belt tension until its pitch matches that of the audio file. You may want to put the sound file on your mobile phone, so it can be played where and when you need it.
    The sound file was recorded from a Mirage with round about 25.000km on it, being about 15.000 miles.

    MP3 audio file: mirage-Belt-tension-plucking-sound.mp3

    Happy twanging
    Foama
    Name:  Belt being plucked.jpg
Views: 450
Size:  37.8 KB


    Last edited by foama; 04-16-2016 at 08:04 AM.

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    91cavgt (04-26-2016),MetroMPG (04-15-2016),mitsumi (04-16-2016),RedRage (04-26-2016)

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    Audio file added to your post!

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        click to view fuel log View my fuel log 2014 Mirage base ES 1.2 manual: 54.0 mpg (US) ... 23.0 km/L ... 4.4 L/100 km ... 64.9 mpg (Imp)


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    hehe thats nice! i can tune a guitar and see if i can tune a belt! lolz

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        click to view fuel log View my fuel log 2015 Mirage GLS 1.2 manual: 26.3 mpg (US) ... 11.2 km/L ... 8.9 L/100 km ... 31.6 mpg (Imp)


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    Thanks, that's a great way to test the tension. Just being curious, and please don't take offense, but was yours measured with an MUT3 beforehand? How do you know the tension on yours is correct?

    What's the procedure for adjusting the belt tension? That and your audio file would make an awesome DIY write up.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 44.1 mpg (US) ... 18.7 km/L ... 5.3 L/100 km ... 52.9 mpg (Imp)


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    Quote Originally Posted by wellswebdesign View Post
    Thanks, that's a great way to test the tension. Just being curious, and please don't take offense, but was yours measured with an MUT3 beforehand? How do you know the tension on yours is correct?

    What's the procedure for adjusting the belt tension? That and your audio file would make an awesome DIY write up.

    The procedure for adjusting the belt tension is totally self-explanatory. The recorded tone was from my car which has a belt with some 25 000km (15000miles) on it, so I can assume it is correct.

    The manual says:

    DRIVE BELT TENSION CHECK
    CAUTION
    * When checking the drive belt tension, make sure that
    the engine is cold.
    * Check the drive belt tension after turning the crank-
    shaft clockwise one turn or more.
    * Check the drive belt tension in the following procedure.
    NOTE: For the vehicles without A/C, the check procedure is
    also same.
    Belt tension meter set (MB992080) MB992081 MB992082 AC507219AB
    1. Connect special tool microphone assembly (MB992082) to special tool belt tension meter (MB992081) of special tool belt tension meter set (MB992080).

    The manual continues to say the tension "when being adjusted" relates to a certain vibration (tone-)frequency when the tension is correct.

    Since I have none of the mentioned metering equipment, I simply go by the tone as recorded when the belt was plucked as in the picture. Probably anyone not having ten left thumbs on his hands and not being tone-deaf can get it right first try without hassle.
    Last edited by foama; 04-26-2016 at 04:14 PM.

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    I need to re-adjust the tension on my belt. Here lately it has been squeeling a lot when driving through water and it used to never do that. My Mirage is sitting at 33,000 miles so it is probably due.
    Certified holder of useless car knowledge.

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    As a guitar player I have to say that I am amazed of this nice sound. Keep up the belts tension and let it sing to fill our hearts with driving joy

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    That sound is a G note, 784hz, or quite close to it.

    An android program called "note analyzer" should work to determine you have the right tension by the right note.
    Zero, my 2014 ES Plus gone but not forgotten. We're driving the Beetle of the 21st century

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        click to view fuel log View my fuel log 2017 Mirage ES PLus 1.2 manual: 39.0 mpg (US) ... 16.6 km/L ... 6.0 L/100 km ... 46.8 mpg (Imp)


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    I've added this to the mods list:

    Mirage Modifications, Customizations, and DIY list

    Foama, looks like we missed a bunch of these threads you did. Got any more squirreled away?
    Custom Mirage products: Cruise control kit, Glove box light, MAF sensor housing
    Current project: Developing a rear sway bar alternative

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage DE 1.2 manual: 41.7 mpg (US) ... 17.7 km/L ... 5.6 L/100 km ... 50.0 mpg (Imp)


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    Quote Originally Posted by Daox View Post
    I've added this to the mods list:

    Mirage Modifications, Customizations, and DIY list

    Foama, looks like we missed a bunch of these threads you did. Got any more squirreled away?

    How about these:

    Reflections in the windshield, getting rid of

    How to do some noise dampening



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