Overrunning alternator (clutched) pulley on B4 with 1Z?

MikeB4

Well-known member
Joined
Apr 18, 2005
Location
Irvine, CA, USA
TDI
1997 Passat TDI Sedan, Candy White
My '97 Passat TDI (B4 with 1Z) has a standard fixed alternator pulley. I will be replacing the alternator soon with a Bosch remanufactured one that is on the way. Is it possible, and is there advantage to putting on an overrunning alternator pulley on alternator that I'm ordering, even though it didn't come with one? My belt tensioner is good and replaced periodically, but it still vibrates a decent amount.

Thanks,
Michael
 

Mozambiquer

Vendor , w/Business number
Joined
Mar 21, 2015
Location
Versailles Missouri
TDI
1998 VW Jetta TDI. 1982 VW Rabbit pickup, 2001 VW Jetta TDI, 2005 VW Passat wagon TDI X3, 2001 VW golf TDI, 1980 VW rabbit pickup,
Yes, make sure to get the Ina ones that are made in Germany, not the aftermarket Chinese ones. If you need one, I've got a few.
 

Windex

Top Post Dawg
Joined
Apr 1, 2006
Location
Cambridge
TDI
05 B5V 01E FRF
The advantage is that the clutched pulley removes the rotating mass in the alternator from the load on the crank pulley. The AHU and 1Z pulleys have been know to deform the crank and sometimes (if bad enough) affect the timing / timing belt to the point of hard starts or even valve damage.

The clutched pulley provides some insurance by removing that amount of rotating mass/inertia from the belt system, and by virtue of driving the belt, the crank pulley.

If any of that makes sense... :-/
 
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