Idler Pulley Failure

[BYprodriver]

I upgraded to the later, lighter pulleys with better bearings.

[Tjkarp]

My pulley failed at startup. It initially sounded like a hung starter (squealing). In the process of replacing it, I discovered the Overdrive Pulley on the Alternator was seized which may have led to the failure to begin with. It was the pulley just downstream of the alternator. I ended up replacing the alternator and pulley and added a new belt as well. My recommendation is if you have a sudden or catastrophic pulley failure, check out the Alternator Overdrive Pulley carefully (on manual transmission cars). If the the ODP clutch is seized, it can put a lot of stress on the whole belt drive train.

[tonythetiger]

Originally Posted by BYprodriver

I upgraded to the later, lighter pulleys with better bearings.

Where did you source? Have a parts list, I’m doing it


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[tonythetiger]

Originally Posted by tonythetiger

Where did you source? Have a parts list, I’m doing it


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So, I’m in the fence before I button everything up. 100k and I think I would be comfortable replacing the idler pulleys or at least the bearings, just need to build a parts list. The kits out there are 300 dollars. Advice?


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[lucoche]

Hello guys,

just to follow up on my repair, Porsche received my parts friday morning so after work i was able to reassemble my brand new upper, lower and tensionner rollers successfully along with the new belt. My car seems to be 100% back to normal, tested today with some savage 3rd and 4th gear highway entries :P

here is the video of the first startup after repair where you can easily see the new parts and hear the pure Porsche powerful sound
https://youtu.be/S2PQG5oh9f4

I think that it is not wrong to replace the bearings but the roller themselves require serious inspection and you never know what previous owners could have done like i found out on my car!!! If you decide to replace the bearings, make sure that you never apply strain on the outer ring of the roller while removing or pressing the bearings in them. And always put the new bearings in the freezer prior to insertion.

In the end, they are not too expensive parts even at the dealer and they are so important to be right as this belt operates absolutely everything crucial. I bought peace of mind. It was also a very pleasant job to perform in the end.

[Starter986]

Originally Posted by tonythetiger

So, I’m in the fence before I button everything up. 100k and I think I would be comfortable replacing the idler pulleys or at least the bearings, just need to build a parts list. The kits out there are 300 dollars. Advice?


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Remove each pulley. From each pulley remove the plastic ring that protects the bearings. Using brake cleaner... carb cleaner... spray out the bearings... clean them up... apply dabs of grease to the cleaned bearings... reinstall plastic ring... reinstall pulleys... enjoy.

If noise remains identify the errant pulley... replace the bearings... you're good to go and you save $190.