C5 alternator question
 

I had to replace the alternator on my 2001 and discovered there are two
versions of alternator. One for auto trans and one for manual. The AT
alternator has a clutch, the MT does not. Basically, what/why? What
does the clutch do and why does it make a difference? Mine is an AT version.

C5 alternator question
 

"FBNE" > wrote in message
...
>I had to replace the alternator on my 2001 and discovered there are
>two versions of alternator. One for auto trans and one for manual.
>The AT alternator has a clutch, the MT does not. Basically,
>what/why? What does the clutch do and why does it make a difference?
>Mine is an AT version.

Millions of vehicles are now factory-equipped with an Overrunning
Alternator Decoupler (OAD) rather than a conventional solid pulley or
one-way clutch pulley. A failure to install the correct replacement
design could cause severe damage to a vehicle's belt drive system.

An OAD Decoupler is similar in appearance to other pulley designs but
plays a vital role in synchronizing the belt drive system. When
replacing an OAD-equipped alternator, the only acceptable choice is
another OAD unit.

Many new vehicle accessory drives are realizing a 1.5% to 2% fuel
economy improvement with an OAD. These improvements are possible by
utilizing a Lean System design philosophy. Lean systems can
significantly reduce the common parasitic losses found in accessory
drives, due to the belt bending that occurs during operation. The
parasitic loss reduction is a result of a holistic approach to
accessory drive - drive layout, OAD, and tensioner design/matching.

Couldn't have said it better myself, we all know that. ;-))

C5 alternator question
 

On 7/10/2012 3:42 PM, Dad wrote:
>
> "FBNE" > wrote in message
> ...
>> I had to replace the alternator on my 2001 and discovered there are
>> two versions of alternator. One for auto trans and one for manual. The
>> AT alternator has a clutch, the MT does not. Basically, what/why?
>> What does the clutch do and why does it make a difference? Mine is an
>> AT version.
>
> Millions of vehicles are now factory-equipped with an Overrunning
> Alternator Decoupler (OAD) rather than a conventional solid pulley or
> one-way clutch pulley. A failure to install the correct replacement
> design could cause severe damage to a vehicle's belt drive system.
>
> An OAD Decoupler is similar in appearance to other pulley designs but
> plays a vital role in synchronizing the belt drive system. When
> replacing an OAD-equipped alternator, the only acceptable choice is
> another OAD unit.
>
> Many new vehicle accessory drives are realizing a 1.5% to 2% fuel
> economy improvement with an OAD. These improvements are possible by
> utilizing a Lean System design philosophy. Lean systems can
> significantly reduce the common parasitic losses found in accessory
> drives, due to the belt bending that occurs during operation. The
> parasitic loss reduction is a result of a holistic approach to accessory
> drive - drive layout, OAD, and tensioner design/matching.
>
> Couldn't have said it better myself, we all know that. ;-))
>
Nicely cut. Any idea why the manual doesn't use the same system?

C5 alternator question
 

"Dad" > wrote in message
.. .
>
> "FBNE" > wrote in message
> ...
>>I had to replace the alternator on my 2001 and discovered there are
>>two versions of alternator. One for auto trans and one for manual.
>>The AT alternator has a clutch, the MT does not. Basically,
>>what/why? What does the clutch do and why does it make a difference?
>>Mine is an AT version.
>
> Millions of vehicles are now factory-equipped with an Overrunning
> Alternator Decoupler (OAD) rather than a conventional solid pulley
> or one-way clutch pulley. A failure to install the correct
> replacement design could cause severe damage to a vehicle's belt
> drive system.
>
> An OAD Decoupler is similar in appearance to other pulley designs
> but plays a vital role in synchronizing the belt drive system. When
> replacing an OAD-equipped alternator, the only acceptable choice is
> another OAD unit.
>
> Many new vehicle accessory drives are realizing a 1.5% to 2% fuel
> economy improvement with an OAD. These improvements are possible by
> utilizing a Lean System design philosophy. Lean systems can
> significantly reduce the common parasitic losses found in accessory
> drives, due to the belt bending that occurs during operation. The
> parasitic loss reduction is a result of a holistic approach to
> accessory drive - drive layout, OAD, and tensioner design/matching.
>
> Couldn't have said it better myself, we all know that. ;-))
>
By the way the pulley number is Goodyear 49908 and cost $90 and if it
fails your alternator will not charge but does not need to be
replaced. No need for a $360 alternator with a new clutch.

C5 alternator question
 

"FBNE" > wrote in message
...
> On 7/10/2012 3:42 PM, Dad wrote:
>>
>> "FBNE" > wrote in message
>> ...
>>> I had to replace the alternator on my 2001 and discovered there
>>> are
>>> two versions of alternator. One for auto trans and one for manual.
>>> The
>>> AT alternator has a clutch, the MT does not. Basically, what/why?
>>> What does the clutch do and why does it make a difference? Mine is
>>> an
>>> AT version.
>>
>> Millions of vehicles are now factory-equipped with an Overrunning
>> Alternator Decoupler (OAD) rather than a conventional solid pulley
>> or
>> one-way clutch pulley. A failure to install the correct replacement
>> design could cause severe damage to a vehicle's belt drive system.
>>
>> An OAD Decoupler is similar in appearance to other pulley designs
>> but
>> plays a vital role in synchronizing the belt drive system. When
>> replacing an OAD-equipped alternator, the only acceptable choice is
>> another OAD unit.
>>
>> Many new vehicle accessory drives are realizing a 1.5% to 2% fuel
>> economy improvement with an OAD. These improvements are possible
>> by
>> utilizing a Lean System design philosophy. Lean systems can
>> significantly reduce the common parasitic losses found in accessory
>> drives, due to the belt bending that occurs during operation. The
>> parasitic loss reduction is a result of a holistic approach to
>> accessory
>> drive - drive layout, OAD, and tensioner design/matching.
>>
>> Couldn't have said it better myself, we all know that. ;-))
>>
> Nicely cut. Any idea why the manual doesn't use the same system?
>
Snap and sharp lag, you know, like how you tear out a CLUTCH.