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The BMW Range
4 Series
Sudden appearance of rattling sound on engine start
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<blockquote data-quote="kevin1982my" data-source="post: 749748" data-attributes="member: 24337"><p>If the oil pressure is still within tolerance, i doubt the sensors will pick it up, even though the rotor is rattling like crazy inside the stator. </p><p></p><p>Industrial machines sometimes have broadband vibration sensors attached to it. By analysing the frequency content of the vibration and how it changes over time, failures can be foretold. Eg: Previously the machine was quiet at 5Hz range and now you have a noise that got progressively louder at 5 hz range over past 3 weeks = something is loose and may be failing soon.With experience, you can even tell which bearing/shaft based on how the frequency peak changes with RPM/load/etc. </p><p></p><p>Unfortunately. Such analysis are not typically done on cars so I believe its the reason why it was not pick up. </p><p></p><p>Anyway, there is a silver lining here. If they change the engine for you, then you would have a new engine for your car. </p><p></p><p>Not sure about the warranty TnCs for BMW nowadays. If it is unlimited millege and you service your ride at BMW all the time, then you should be golden.</p></blockquote><p></p>
[QUOTE="kevin1982my, post: 749748, member: 24337"] If the oil pressure is still within tolerance, i doubt the sensors will pick it up, even though the rotor is rattling like crazy inside the stator. Industrial machines sometimes have broadband vibration sensors attached to it. By analysing the frequency content of the vibration and how it changes over time, failures can be foretold. Eg: Previously the machine was quiet at 5Hz range and now you have a noise that got progressively louder at 5 hz range over past 3 weeks = something is loose and may be failing soon.With experience, you can even tell which bearing/shaft based on how the frequency peak changes with RPM/load/etc. Unfortunately. Such analysis are not typically done on cars so I believe its the reason why it was not pick up. Anyway, there is a silver lining here. If they change the engine for you, then you would have a new engine for your car. Not sure about the warranty TnCs for BMW nowadays. If it is unlimited millege and you service your ride at BMW all the time, then you should be golden. [/QUOTE]
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Sudden appearance of rattling sound on engine start
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