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Steve Tinker · 05-06-2015, 05:55 PM

On manual transmission cars, the alternator has a free wheel clutch integrated with the pulley. This can seize in a worst case scenario.
A couple of years ago, I heard a slight clicking / rattle sound @ idle which stopped when I ran the engine with the accessory belt removed. I found it was the alternator clutch on its way out - it felt very notchy when turned by hand.
You also need a special splined removal tool to get the clutch off the shaft.

05-06-2015, 05:55 PM	#51
Steve Tinker Registered User Join Date: Dec 2008 Location: Queensland, Australia Posts: 1,522	On manual transmission cars, the alternator has a free wheel clutch integrated with the pulley. This can seize in a worst case scenario. A couple of years ago, I heard a slight clicking / rattle sound @ idle which stopped when I ran the engine with the accessory belt removed. I found it was the alternator clutch on its way out - it felt very notchy when turned by hand. You also need a special splined removal tool to get the clutch off the shaft. __________________ 2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley. 2001 MV Agusta F4.