E30 Timing belt whine after replacement Help needed!

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  • Blau320i
    Noobie
    • Jul 2026
    • 4

    #1

    E30 Timing belt whine after replacement Help needed!

    Hello!

    this is my first post on the forums so I'm hoping somebody might be able to lend a hand , I recently did a timing belt and water pump change on my 320i (we also replaced the spring and guide pin on the tensioner) , now as far as I can tell ever since I had the belt done it has had a whine which appears whenever I rev the engine
    at first I thought it was my fan clutch but after removing the accessory belt the noise remained , it sounds like when a viscous fan is on full lock I will link a video of the noise so you can hear it for yourselves , now as far as I know we did the procedure correctly for tensioning the belt ,
    we fully compressed the spring on the tensioner , set TDC and fitted the new belt , released the two 13mms and the spring set itself against the tensioner , locked the tensioner down then spun the engine two full rotations then slacked off the tensioner nuts to see if there was any additional movement which there was not , then locked it down again , I did some digging online and some say that the noise will eventually go away , im not sure how true this is but I don't really drive the car much so I don't see that happening on its own
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