986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - It's incredible how much noise that alternator pulley can make!

deathsled986 · 03-07-2018, 01:22 PM

That clutched/freewheeling (is it viscous?) alternator pulley on the manual cars sure can make a lot of noise when it fails! It's crazy how bad it sounds once seized up. I guess maybe it's from the ball bearings tossing around inside it? My 986 has sounded like garbage at idle for a long time. It sounded like one of those rock tumblers you use to polish rocks. I finally got in there the other day to isolate the noise (I knew it wasn't internal and was fairly confident it wasn't from the clutch/bearing so I let it slide for a long time) and today got the replacement pulley on. She's quiet as a mouse now (aside from the Ti exhaust) and I'm no longer embarrassed at stop lights and parking lots haha.

03-07-2018, 01:22 PM	#1
deathsled986 Registered User Join Date: Jun 2017 Location: Southeast Posts: 73	It's incredible how much noise that alternator pulley can make! That clutched/freewheeling (is it viscous?) alternator pulley on the manual cars sure can make a lot of noise when it fails! It's crazy how bad it sounds once seized up. I guess maybe it's from the ball bearings tossing around inside it? My 986 has sounded like garbage at idle for a long time. It sounded like one of those rock tumblers you use to polish rocks. I finally got in there the other day to isolate the noise (I knew it wasn't internal and was fairly confident it wasn't from the clutch/bearing so I let it slide for a long time) and today got the replacement pulley on. She's quiet as a mouse now (aside from the Ti exhaust) and I'm no longer embarrassed at stop lights and parking lots haha.