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Thread: Is the aux belt tensioner really self-tensioning?

  
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    Is the aux belt tensioner really self-tensioning?

    Aux belt / fan belt etc.

    I'm getting a slight squeal from around my aux belt area which is irritating me now. It's not loud but I notice it and I want it stopped.
    My mechanic said rather nonchalently that the tensioner probably needs replacing.
    I asked him if it could simply be re-tightened or whatever, but he said no - on this car the tensioner is self-tensioning and if it starts producing a noise you have to replace it.

    Is this right?

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    He's sort of correct... the tensioner on most recent VX diesels is spring-loaded, pressing against the belt to tension it correctly. If the spring has broken or lost it's strength, it's new tensioner time I'm afraid. However, an old belt can give similar symptoms.

    On the plus side, a new tensioner isn't megabucks.
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    Thanks for the reply.
    How would I go about checking that the spring has gone (and therefore the whole tensioner needs replacing) as opposed to the tensioner just needs 'tightening'?

    I'd obviously prefer to tighten it first and go from there as that would be free if I can DIY Is it an easy-peasy job for a novice like moi?

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    It's easy enough to change, it'll be access to it that might be a pain. I'll admit I'm not 100% au-fait with the Isuzu engine, but a self-tensioner should be fairly strongly sprung... you should just about be able to move it by pulling on it with your hand. If it's very easy to move, you'll probably need a new one.
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    If the tensioner has gone, it will be on its full extension.

    You shouldn't be able to move it with your hand put it that way, Try getting a ring spanner on the tensioner nut, pulling it towards you and letting it return, it should return under its own tension, quite quickly.
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    Thanks so much guys for your help.

    Could someone post up a pic of which sprocket is the tensioner one I need to check? I can see about 4 or 5 'sprockets' on that side of the engine. I have the aircon model too.

    Also any dangers I need to be aware of, e.g. if I try to pull it by hand can it spring back and catch my fingers dangerously? Which way do it pull it if I am standing parallel to the drivers side wing for example?

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    Hi there, I punched a year 2000 Y17DT into TIS 2000, looked up tensioner...



    Thought you might also want the removal/install info as well



    Cheers, Paul

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    Quote Originally Posted by paul.spencer View Post
    Hi there, I punched a year 2000 Y17DT into TIS 2000, looked up tensioner...



    Thought you might also want the removal/install info as well



    Cheers, Paul
    Many, many thanks for that Paul. You are a star. What's TIS?

    I will check my tensioner this weekend hopefully now.

    It says above that you have to "tension" it and then "allow to glide back".
    Does that mean you need to tighten it hand-tight with a spanner and then watch it try to glide back round? If it glides back then it's ok?

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    I couldn't decide if the belt was at fault and/or if the tensioner was worn out so I've booked my car in to my local tomorrow for him to check and inform me. Hopefully he won't charge just for checking - he's good like that. After his check I may do the actual work myself.

    The Haynes manual says to get at the tensioner you have to disconnect the MAF and sensor too......huh??? Is that really necessary?
    And it gives guidance on tightening torque (like the TIS above)....I don't have a torque meter so would "hand-tight" be sufficient?

    Sorry for all the Q's. I am a novice.

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    I think that is just in the case you might knock it and break it etc. Everything is acessible without any dismantling.

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