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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 06-04-2011, 03:38 AM   #1 (permalink)
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Question About Fan Nut

I have finished assembling the car after a coolant system overhall. Question on the Rad fan nut, since it is reverse thread, it is self tightening? I have it as tight as I can get it without turning the whole engine crank and accessories. Should I somehow lock the drive belt down and keep tightening the 32mm nut or will it continue to tighten on its own? Thanks!
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Old 06-04-2011, 07:43 AM   #2 (permalink)
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No, it won't tighten on it's own because the centrifugal forces are not great enough... It won't unscrew itself either !!
You could have put some "Thread-seal" on before yo tightened it, just for your peace of mind.
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Old 06-04-2011, 06:12 PM   #3 (permalink)
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Its probably not even necessary to use the loctite. Once its on tight, there aren't any forces that are going to loosen it, other than a monkey with a spanner.

When I removed mine, it took two burley guys with breaker extension bars to undo it, and it wasn't chemically bound, it was probably just the original thermo fan after 10 years of use.
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Old 06-05-2011, 08:45 AM   #4 (permalink)
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Well said, Brett !
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