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Thread: Crankshaft pulley/Harmonic Balancer/TV Damper

  1. 31st July 2009, 01:53 PM #1
    PrettyFly
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    Crankshaft pulley/Harmonic Balancer/TV Damper

    Hi all,

    Apologies in advance for the long winded explanation.

    Could anyone let me know if they have ever had any problems with a loose crankshaft pulley in a TD5 resulting in the engine functioning ok but the crankshaft pulley not turning and therefore loss of all peripherals driven by the main fan belt?

    The story so far: My D2 TD5 recently underwent some mechanical work at a reputable Brisbane Land Rover Mechanic. Amongst other things, one of the items worked on was a very noisy harmonic balancer. This was replaced and I went home happy but with a lighter wallet.

    A week later, as I was driving towards the local school to pick up my kids, I lost the alternator, the power steering, the power brakes and ACE. A quick check under the bonnet revealed that the fan belt was still tensioned but that the crankshaft pulley was no longer turning.

    My first thought was that the mechanics had not reassembled the pulley correctly after replacing the harmonic balancer. It was quickly sent back to the mechanics shop on the back of a tow truck. The next day I picked up the D2 and was told that it was fixed for now but that it could happen again. The mechanic told me that it (the crankshaft pulley) was held on by just one bolt - which is correct as I have checked the workshop manual on RAVE - but that the position that the pulley normally sits in is quite worn which makes it difficult to get it really tight.

    He told me that they had gotten it as tight as possible and also used some liquid metal to hold it in place this time. He advised that it could last 10 years like that but that it could also let go again at any time in which case they would need to replace the crankshaft at great expense.

    My question is, has anyone seen this before in a TD5 or is the mechanic spinning me a story to hide the fact that they didn't reassemble the pulley correctly? The answers are important to me because if there is any chance that the pulley comes loose again, I'll seriously consider getting rid of the disco.

    Thanks to all.
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  2. 31st July 2009, 02:15 PM #2
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    Scouse
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    There should be a keyway to hold the damper in the right spot. If the forgot this or it has flogged out, then that might be the cause of it spinning.
    What was wrong with your original damper?
    Scott
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  3. 31st July 2009, 02:43 PM #3
    PrettyFly
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    The original damper was shot, rattling like a tin can full of stones.
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  4. 31st July 2009, 02:50 PM #4
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    But it wasn't loose on the crankshaft?
    If not, then there's no reason I can think of why the new one should come loose other than the bolt being left loose.

    You mentioned that he said the position that the pulley normally sits in is quite worn which makes it difficult to get it really tight - that doesn't explain the bolt coming loose in my book.
    That sounds like he's saying the crankshaft is was worn before he even fitted the new pulley .
    Scott
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  5. 31st July 2009, 03:07 PM #5
    PrettyFly
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    Yes good point Scouse. It's looking more and more like they may have made a mistake and are covering up rather than be embarassed by admitting to it. At least I'm hoping so as the car is going really well now - when the crankshaft pulley is turning that is...
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  6. 31st July 2009, 03:28 PM #6
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    alien
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    339 ft/lbs

    When I ceased an idler bearing and broke the belt(Should investigate noises eirlier), Mine broke the rubber in the damper and made a horrible noise.

    2nd hand unit fitted(bolt supplied), NO KEYWAY on these cranks. Had about three goes to get it tight.

    Rave CD =455 Nm /336 lbf.ft Haynes 460 Nm /339 lbf.ft. (Recomended to change bolt)

    Yes it is that tight, have to do mine again as timing case off.

    Cheers.
    Last edited by alien; 31st July 2009 at 03:30 PM. Reason: Correct no.s
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  7. 31st July 2009, 06:56 PM #7
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    Quote Originally Posted by alien d2 View Post
    NO KEYWAY on these cranks.
    Well, there you go - I didn't know that.

    As I suggested before, if you're original damper wasn't actually loose on the crankshaft, the only reason I can think of why it would come loose is that he left the bolt loose. I hope it holds together for you now otherwise it might take a bit of work to fix properly.
    Scott
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  8. 31st July 2009, 08:20 PM #8
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    I wonder if the bolt is too long. Wasn't that a problem with early 300Tdi engines?
    Ron B.
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  9. 31st July 2009, 08:45 PM #9
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    I thought that was a tdi200 thing.

    if you have a hardnening failure of the harmnic balancer (I've heard of it once and never ever seen an actual case of it and I half suspect that the reported fact that it can happen is something of a myth but anyway in case its not) in theory it can work loose on the crank. Im lead to believe that it happens because the crank can then hammer at the pully and theres no vibrational dampening.

    Ive seen it happen when a standard pully has been put on in place of a Harmonic balancer but harmonic balancers usually just split apart.
    Dave

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