[Vwdiesel] Free wheeling alt pulley WasRe: Re undersized pulleys-1.5 engine

[dieseltdi at verizon.net]

Hey thanks for the info.  Nice to know exactly why they did it.  I  
actually have a brand new one sitting on a shelf that I bought for a  
1.9 project that didn't happen.  Hayden
On Aug 28, 2008, at 2:42 PM, Sandy Cameron wrote:

> At 01:56 PM 28/08/2008 -0500, you wrote:
>> As far as pulleys and alternators are concerned, my 04 Jetta TDI  
>> actually
>> has a pulley on the Alternator that freewheels at certain speeds  
>> thereby
>> reducing the load on the engine.  I guess since there is minimal  
>> electrical
>> usage on diesels they decided to save a bit.  Hayden
>>
>
>
> No, it doesn't freewheel at certain speeds, it is an overrunning  
> clutch that
> allows the alternator to overrun and slow down slower than the  
> engine when
> decelerating suddenly, (like on rapid up shifts).
>
> This reduces serpentine belt whip, caused by the rotating mass  
> inertia of
> the alternator and came about because of early tensioner bushing  
> wear-out,
> and also might have had something to do with the crankshaft nose  
> failure on
> early 1.9s.
>
> It became standard equipment on the TDIs. I have retrofitted one on  
> my 94 TD
>
> Sandy
> VE3AAC
>

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