Updated alternator pulley
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From: Boston, MA
Updated alternator pulley
So, it appears that I need the updated alternator pulleys. A couple of questions:
- 993-106-268-01 is the correct current part number?
- Has anybody used URO parts vs Porsche parts? If so, what do you think?
- The pulley can be replaced without removing A/C belt?
- Any other thoughts or nuances?
- 993-106-268-01 is the correct current part number?
- Has anybody used URO parts vs Porsche parts? If so, what do you think?
- The pulley can be replaced without removing A/C belt?
- Any other thoughts or nuances?
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Hi Nile,
Here is the Technical Service Bulletin (TSB) on the subject.
Since a TSB was issued, I seem to recall it may be a fee part from the dealer if you remind them of the TSB. They may not go for it, but it is worth a try.
It can be ordered under the numbers on the TSB. If the part number was superseded, whoever you buy it from will still be able to look it up under the old number.
Here it is in the Pelican Parts catalog showing a supersession on the pulley halves to the part ending in "02":
https://www.pelicanparts.com/More_In...=c&SVSVSI=0647
Andy
Here is the Technical Service Bulletin (TSB) on the subject.
Since a TSB was issued, I seem to recall it may be a fee part from the dealer if you remind them of the TSB. They may not go for it, but it is worth a try.
It can be ordered under the numbers on the TSB. If the part number was superseded, whoever you buy it from will still be able to look it up under the old number.
Here it is in the Pelican Parts catalog showing a supersession on the pulley halves to the part ending in "02":
https://www.pelicanparts.com/More_In...=c&SVSVSI=0647
Andy
Last edited by pp000830; Jun 11, 2026 at 11:19 AM.
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Interesting, Andy. Saw that TSB before, but have not heard about them giving it for free. Was it just a free part or did they actually install it as well?
I did order a pair of URO parts from Amazon, cheap enough not to worry much, but curious if they are the same as OEM.
I did order a pair of URO parts from Amazon, cheap enough not to worry much, but curious if they are the same as OEM.
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Originally Posted by TakeFour
I doubt that they are cast
This comes up every year. The belts only need to be tight enough to not squeal with rpm changes.
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Hi TakeFour,
I installed one in my car. The original pulley halves were stamped sheet metal and are silver in color. The upgrade pulley halves are cast and gold chromate-finished. I think the casting provides better dimensional stability, which is why it was made in this way.
Andy
I installed one in my car. The original pulley halves were stamped sheet metal and are silver in color. The upgrade pulley halves are cast and gold chromate-finished. I think the casting provides better dimensional stability, which is why it was made in this way.
Andy
Last edited by pp000830; Jun 14, 2026 at 11:56 AM.
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My alternator belt shredded, so I ordered the updated pulley from the dealer. They said it was wrong for my vin, so I sent them the pdf showing the update and they said okay, but changed the order to the old design pulley halves anyway. 
When I received the same thing I already had, I got fed up and told them to give me a refund and pay for return shipping, and ordered the "Genuine porsche part" off ebay. That ebay pulley showed up 3 weeks late and was a URO part removed from the original packaging. 
All that to say, I can give an unintentional review of the URO part. It's silver, and looks nice on the engine. However I don't think the battery is being charging properly. But I'm not sure if that's because of the pulley, or the voltage regulator, or the alternator itself. If I were you I would order the part from Porsche and tell them to go away when they ask for a VIN.
When I received the same thing I already had, I got fed up and told them to give me a refund and pay for return shipping, and ordered the "Genuine porsche part" off ebay. That ebay pulley showed up 3 weeks late and was a URO part removed from the original packaging. All that to say, I can give an unintentional review of the URO part. It's silver, and looks nice on the engine. However I don't think the battery is being charging properly. But I'm not sure if that's because of the pulley, or the voltage regulator, or the alternator itself. If I were you I would order the part from Porsche and tell them to go away when they ask for a VIN.
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I already ordered URO, so will see if I want to put it in (cheap and returnable, from Amazon). If I do, will measure the voltage with old and new pulleys if I don't manage to forget.
The plus side is that there was no noises today, so, I' thinking that the belt just stretched a bit and might be OK. If so, will just carry the new OEM belt and this new pulley halves until the car eats the current belt.
The plus side is that there was no noises today, so, I' thinking that the belt just stretched a bit and might be OK. If so, will just carry the new OEM belt and this new pulley halves until the car eats the current belt.
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https://993servicerepair.blogspot.co...fan-belts.html
If you tension the belt using the KriKit gauge and replace the fan and alternator belts every 30K miles, you will never shred a belt going forward.
If you plug a volt meter into your cigarette lighter plug and it shows 13.5 to 14.2 volts with the engine running, the alternator is producing voltage in the correct range. If, a few seconds after turning the engine off, the voltage settles to 12.6 volts or higher, your battery is in good shape.
Andy
Last edited by pp000830; Jun 12, 2026 at 06:15 PM.
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BTW theoretically... When replacing the pulley with the new design and re-using the belt, would the number of shims remain the same? Or is the internal angle different on the new pulley halves?
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I would assemble it with the same number of shims, then run the engine for a few moments.
Then check the belts' tension with the Gates KriKit gauge, and if out of specification, adjust the number of shims.
Be aware that the new pulley halves do not allow storage of unused extra shims on the pulley shaft.
Andy
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It is probably not the upgrade pulley if you tensioned the belt correctly by using the correct number of shims and checked the tension with the Krikit belt tensioning gauge, and the below procedure:
https://993servicerepair.blogspot.co...fan-belts.html
If you tension the belt using the KriKit gauge and replace the fan and alternator belts every 30K miles, you will never shred a belt going forward.
If you plug a volt meter into your cigarette lighter plug and it shows 13.5 to 14.2 volts with the engine running, the alternator is producing voltage in the correct range. If, a few seconds after turning the engine off, the voltage settles to 12.6 volts or higher, your battery is in good shape.
Andy
https://993servicerepair.blogspot.co...fan-belts.html
If you tension the belt using the KriKit gauge and replace the fan and alternator belts every 30K miles, you will never shred a belt going forward.
If you plug a volt meter into your cigarette lighter plug and it shows 13.5 to 14.2 volts with the engine running, the alternator is producing voltage in the correct range. If, a few seconds after turning the engine off, the voltage settles to 12.6 volts or higher, your battery is in good shape.
Andy
Last edited by NeinEleven; Jun 13, 2026 at 02:33 PM.
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Thanks, Andy. Yeah, I've read the "no shim storage" line in TSB as well.
BTW, those shims... Are extras available outside of Porsche, i.e., do we know what size to get and where?
BTW, those shims... Are extras available outside of Porsche, i.e., do we know what size to get and where?
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A brand-new, fully charged battery can produce 12.7 volts even with the engine (alternator) not running.
With the factory setup, the voltage while running should be between 13,5 and 14.2 Volts. With the aftermarket single pulley, the alternator may spin a bit too slowly at idle to achieve this. There is a workaround for this.
If the belts are tensioned correctly with the original or updated pulley and the connections to the alternator and battery are in good shape, your alternator is marginal, and rebuilding it should be considered.
Andy
With the factory setup, the voltage while running should be between 13,5 and 14.2 Volts. With the aftermarket single pulley, the alternator may spin a bit too slowly at idle to achieve this. There is a workaround for this.
If the belts are tensioned correctly with the original or updated pulley and the connections to the alternator and battery are in good shape, your alternator is marginal, and rebuilding it should be considered.
Andy
Last edited by pp000830; Jun 14, 2026 at 11:45 AM.