N55 belt hiss

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		BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i) > Technical / Specific Topics > 135i Turbo Engine (N54 / N55), Exhaust and Drivetrain Modifications
N55 belt hiss

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06-08-2022, 12:27 PM	#1
tjbrett New Member 0 Rep 7 Posts Drives: 2011 BMW 135i DCT Join Date: May 2021 Location: Minnesota iTrader: (0)	N55 belt hiss Hi all, after replacing my belt and all belt components (kit from Fcp and a harmonic balancer I had lying around) my belt is now hissing. I'll attach a video of the sound here. This is really concerning as I just finished my engine rebuild after it sucked a belt up a while ago. It's not leaking oil or anything onto the belt. Also it only makes this hissing sound once it is warmed up. Let me know what you think it could be, thanks. https://youtu.be/8DNLjVjtjUE
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