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Thread: Help me identify this engine noise

  1. 09-24-2024, 05:20 AM #1
    Nhs15
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    Help me identify this engine noise

    1970 911t, engine rebuild about 6 years ago. Just last week this rhythmic sort of rubbing engine sound started. There at idle and increases with revs. No change in performance. Coming from fan area so assumed it was the fan rubbing on the housing. Removed the pulley and belt and fan seems to spin fine. No cracks on shroud. Can alternator make this sound? Any other areas to look? Hope the video helps. Thanks.

    https://youtube.com/shorts/xJYv4shA4_Y?feature=share
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  2. 09-24-2024, 05:35 AM #2
    jim amato
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    Run it with fan belt removed, if the sound is still present, check chains and guides
    registry #2072
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