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Thread: BMW 735i e65 N62 engine clatter/knocking. Help with identification of source

  1. #1
    Join Date
    Apr 2017
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    cirencester, UK
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    BMW 735i E65

    BMW 735i e65 N62 engine clatter/knocking. Help with identification of source

    Hello all

    I have just purchased an E65 735i and it seems to have a bit of an engine knocking sound and I am having difficulty identifying the source. I will link to a youtube video I made of the sound and wondered if the source was obvious to anyone. The engine is running at approx 2500 rpm.

    When started from cold the car is quiet and only starts making the noise as it warms up.

    I have removed the alternator belt to eliminate the water pump and alternator.

    I have gone over the engine with a stethoscope but it hasn't proved much help in identifying the source. The sound seems to be coming from the intake manifold area and if I put my ear to the wheel arches the RHS drivers side (UK) seems to be louder than the LHS. could an aircon compressor make this noise? I cannot get down that far with the scope?

    I have ordered new timing chain tensioners but they will not arrive for a few days although I don't think this is a timing chain rattle or the chain guide in pieces.

    I've trawled the internet for videos of other knocking etc but cannot find one quite the same.


    The car has covered 120K. I have a dedicated BMW diagnostic tool and it reports no faults anywhere. Any tips or pointers would be most welcome.

    Thanks



    http://www.youtube.com/watch?v=Kzs5E...ature=youtu.be
    Last edited by sponcom; 05-05-2017 at 10:29 AM.

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