mike of dalcharn Posted December 3, 2008 Share Posted December 3, 2008 Hi there, My old 300 TDi is making an odd noise, rather like someone putting a bamboo cane against the spokes of a spinning bycycle wheel. I have run 1500 miles with this, after the journey it stopped making the noise, but two days later it started off again. Could this be the injector pump, are they expensive and are they easy to fit? I live 120 miles from nearest city, up 100 miles of single track road, I depend on the 'beast' but my, my, it is a troublesome thing!! Cheers. Quote Link to comment Share on other sites More sharing options...
TheRecklessEngineer Posted December 3, 2008 Share Posted December 3, 2008 Could be many things... How fast is this noise? Does it vary with engine speed? Does it disappear with enough revs? Can you tell where roughly on the engine it is coming from? Injector pumps are a pig to fit and very expensive. My guess at this stage would be the vacuum pump - left hand side of the engine, behind the injection pump. But that's only a guess... Quote Link to comment Share on other sites More sharing options...
mike of dalcharn Posted December 3, 2008 Author Share Posted December 3, 2008 Could be many things...How fast is this noise? Does it vary with engine speed? Does it disappear with enough revs? Can you tell where roughly on the engine it is coming from? Injector pumps are a pig to fit and very expensive. My guess at this stage would be the vacuum pump - left hand side of the engine, behind the injection pump. But that's only a guess... Hi there. O.K.the noise doesn't vary in proportion to the engine revs, it does speed up with revs but not in proportion to the actual revs. With enough revs you can't hear it but then again you cant hear yourself think either! Once upto 3000 rpm you dont hear anything, I did 1500 miles the other week on one journey travelling upto to 80mph. One stretch at 80mph for 4 hours, couldn't hear it. When I stopped it wasn't making a sound, I carried on and a few hours later, at low speeds I heard it start again. Sometimes it goes away, comes back, goes away etc. If I swith off and back on it is quiet for 30 seconds or so and then off it goes again. Sometimes it stops once the engine is warm and you swith on and off a few times. Currently it is persitant but does go off for a while then back again. At first I thought it was the fan catching the detachable cowling over the top of it, it wasn't. The noise comes from the front of the engine itself, slightly to the drivers side if looking directly at the engine. I thought it might be one of the guide pulleys, or the aircon. but no! It's behind the fan and slightly to the left of it. It sounds just like someone holding a stick against a moving bike wheel spokes. Quote Link to comment Share on other sites More sharing options...
western Posted December 3, 2008 Share Posted December 3, 2008 could be a noisy tensioner bearing for the serpentine belt. Quote Link to comment Share on other sites More sharing options...
reedx Posted December 3, 2008 Share Posted December 3, 2008 Problem with the viscous fan unit? Colin www.REEDX.net/landrover Quote Link to comment Share on other sites More sharing options...
Phantom Posted December 3, 2008 Share Posted December 3, 2008 Take aux belt off, run the engine up and if the noise is gone then it's related to the belt run / auxillarys. If the noise is still there then its engine related. Stethoscope's work well, you can check all the individual componenets with the engine running. Good kuck. Lee Quote Link to comment Share on other sites More sharing options...
TheRecklessEngineer Posted December 3, 2008 Share Posted December 3, 2008 I would still bet vacuum pump - I had these symptoms when mine went. You can also get a tapping from the lift pump when the fuel filter clogs. Might be worth changing this first as it is only a few £ as opposed to £70ish from the vacuum pump. Might be worth using a long screwdriver or extension bars against your jaw, then placing other end against various engine components to see if you can find it. Quote Link to comment Share on other sites More sharing options...
Turbocharger Posted December 3, 2008 Share Posted December 3, 2008 If it sounds like a stick in bicycle spokes then I'd look for exactly that - you could turn the engine slowly using the nut on the front of the crank and see if it makes the same noise - then you can track it down slowly while everything's quiet. Quote Link to comment Share on other sites More sharing options...
mike of dalcharn Posted December 3, 2008 Author Share Posted December 3, 2008 could be a noisy tensioner bearing for the serpentine belt. I checked all the guide pulleys, tensioners and nothing, removed belts, still there. Really dosen't sound like it's coming from the fan which seems to be fine. I will check the other suggestions of : vacuum pump and lift pump tomorrow and see if I can isolate it a bit more. It does seem to be around the area of the aircon unit, so thats the area of the injector pump, lift pump so.......... lets see. Thanks, i'll get back to you all. Quote Link to comment Share on other sites More sharing options...
iamtobermory Posted January 11, 2009 Share Posted January 11, 2009 I checked all the guide pulleys, tensioners and nothing, removed belts, still there. Really dosen't sound like it's coming from the fan which seems to be fine. I will check the other suggestions of : vacuum pump and lift pump tomorrow and see if I can isolate it a bit more. It does seem to be around the area of the aircon unit, so thats the area of the injector pump, lift pump so.......... lets see.Thanks, i'll get back to you all. Hi, Did you get to the bottom of this one? I have exactly the same problem, I noticed it yesterday morning. I even checked the fan as I thought something had got stuck in the housing... Quote Link to comment Share on other sites More sharing options...
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