300 Tdi Serpentine belt failure - Defender Source
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  #1  
Old May 24th, 2006, 04:15 PM
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300 Tdi Serpentine belt failure

I've had 2 serpentine belts shread in the last 200 or 300 miles under normal driving conditions. My truck is currently in the shop and they're telling me it needs a new idler pulley, which they have procured and are about to install. Can anyone (Pendy) tell me if this sounds like an accurate assessment? I trust my shop, I'm just really not familiar with this diesel powerplant. Would the idler pulley cause a breakdown in my serpentine belts like this or could it be something else?

FYI, I just has the serpentine belt AND the timing belt replaced about 200 miles ago. The timing belt that they removed still looked new with no visible/abnormal signs of wear. The serpentine belt was beginning to shread on one side. This last serpentine belt that failed ( the same one they replaced when they installed a new timing belt) completely shreaded. I feel like an idiot even asking this question, so forgive me. I really need to get up to speed with this engine....fear of the unknown....
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  #2  
Old May 24th, 2006, 08:03 PM
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IT could be... Maybe the idler has siezed up and has worn the crap out of the belt. Also since they had all the pulleys off to do the timing belt, I would make sure they put everything back correct and nothing is misaligned. That would cause the edge to wear and shred eventually...
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Old May 24th, 2006, 08:37 PM
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I accidentally screwed up my AC belt by not tightening the tensioner enough. It didnt jump the pulleys, instead it just shredded itself.
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  #4  
Old May 24th, 2006, 08:57 PM
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I seem to remember an issue with some idler pulleys not properly lining up with the rest of the pulleys in the system - this was a big issue in the mother country and caused some sort of controversy about a lack of recall and response from the dealers on what should have been a warranty issue. I think there were some letters to the editor in one of the British Land Rover magazines a few years ago.

If my memory is correct replacing the idler pulley with the latest version solves teh problem.
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Old May 24th, 2006, 11:26 PM
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Yep,

Its a common problem. The idler pully gets loose/offline and it will cause the belt to move around and can wear it very fast. It happened to me. I now carry a spare belt in the truck. Once I fixed the pully, it never happened again.
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Old May 25th, 2006, 02:53 PM
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Thanks so much you guys. I'm glad there's such an abundance of Tdi guys here. Thanks again.
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