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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 02-17-2013, 12:59 PM   #1
Registered User
Join Date: Oct 2005
Location: Overland Park, KS
Posts: 6
My Ride: 330ci 2006
Post Fan Clutch Grinding-Rattle

My 2006 330ci with 25000 miles developed a grinding-rattle noise at the front of the engine. I first thought it was the water pump. Holding a steel rod against the water pump and my ear with the engine running proved it was not making the noise. I checked the air conditioner compressor and the idler pulleys were not the noise source either. Then I noticed the fan was wobbling slightly as it turned. I found the fan could be moved back and forth about 1/4 to 3/8 inches. The bearings in the fan clutch were bad, causing the fan to cavitate making the noise. Using a 36mm wrench and clutch holder (Left hand thread) I removed the fan with the plastic shroud. The clutch nut wobbled in its socket. After replacing the clutch with a new part the noise has gone away. Check this out before replacing the water pump if it is just a noise. If you find leaking coolant from the pump then it is time to replace the pump.
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