90200tdi Posted October 12, 2010 Share Posted October 12, 2010 Hi i've a Defender 2001 TD5 with 80,000 miles on it and the tensioner for the alt belt was making a racket and flapping about when ticking over, so a new one was ordered and fitted but now the noise is gone but its still flapping about. Why is it flapping about ? it moves at least 1/2" each way so an inch overall movement and if it continues it won't be long till the noise returns.It flaps about four times a second, hard to say really. This can't be normal, i've a 300TDI and no movement out of the tensioner when its running. Also is there a common leak point for coolant as its losing some ? Quote Link to comment Share on other sites More sharing options...
crwoody Posted October 12, 2010 Share Posted October 12, 2010 When you say "... its still flapping about ..." do you mean the spring loaded tensioner or just the belt? I think the belt flapping about is not unusual to a degree, more so when the engine is just ticking over, I know my old Td5 used to do it, I've just been out and checked the one I have now and it does it too but a lot less. If it's as bad as you suggest, I think I'd try a new belt first, maybe it's worn unevenly. While you've got the belt off, it's worth checking that all the other pulleys turn easily without any undue stiffness or noise, I've has to replace a few bearings in that area due to water/mud getting through the seals and wrecking the bearings. As for the leak, I have to say I've never had a problem here so I can't say. Quote Link to comment Share on other sites More sharing options...
90200tdi Posted October 12, 2010 Author Share Posted October 12, 2010 Thanks i'll have a look tomorrow. Quote Link to comment Share on other sites More sharing options...
landy andy. Posted October 13, 2010 Share Posted October 13, 2010 I have had this when I had a britpart belt fitted, and it also had a chirping sound. Changed it to a Land rover belt and it was much better and no noise. Andy Quote Link to comment Share on other sites More sharing options...
M&S Posted October 13, 2010 Share Posted October 13, 2010 Me too Andy Quote Link to comment Share on other sites More sharing options...
ashtray Posted October 13, 2010 Share Posted October 13, 2010 I dont know if td5s have this but on merc diesels the alternator has a one way bearing fitted to the pulley. When this seizes it causes the belt to flap about. But, like i said, i am unsure if this is a feature on td5's Quote Link to comment Share on other sites More sharing options...
Aragorn Posted October 13, 2010 Share Posted October 13, 2010 Audis have the same 1 way pulley, and same siezing symptoms. The flapping is probably caused by a partially siezed pulley somewhere, which gets tighter and slacker as it turns, this in turn means the load on the belt climbs and falls, and the tensioner takes up the difference. Quote Link to comment Share on other sites More sharing options...
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