When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
As Steve already said. But for a 'new' fan, I'd suspect worn alternator bearings, worn fan hub bearing, a distorted fan housing from overtightening the strap, or something was sucked in while the engine was running. If one blade shears off, others will likely follow as the fan does its best imitation of a Cuisinart food processor...
In any event, you need to replace it as having metal shards potentially flinging around in the engine is generally not a good idea. When you remove it carefully inspect the top of the engine cylinders behind the alternator as some of the shards may be in there. I would recommend using a belt tensioning gauge when reinstalling the belts to avoid inducing clearance issues as a result of over tightening the belts. Once the new belts are in place run the engine for a short time to seat a little and check the tension again.
Andy
or something was sucked in while the engine was running.
Probably too obvious - and too random to really be suspect - but just in case, are you missing one of the two bolts that attach the engine cover latch - just across from the fan when closed?
As Steve already said. But for a 'new' fan, I'd suspect worn alternator bearings, worn fan hub bearing, a distorted fan housing from overtightening the strap, or something was sucked in while the engine was running. If one blade shears off, others will likely follow as the fan does its best imitation of a Cuisinart food processor...
Andreas
Now that fan would make one interesting "Salvador Dali" clock, Andreas.
Does anyone know if there is an after market fan available at a better price than the OEM one?
I know Steve Weiner-Rennsport Systems was working on this back in 2016 but as of March of this year he has shelved it until Porsche no longer sells them.
I know Steve Weiner-Rennsport Systems was working on this back in 2016 but as of March of this year he has shelved it until Porsche no longer sells them.
We do make 993TT fans since Porsche has discontinued that part but as Chuck said, I won't tackle the 3.6 N/A fans unless the Factory quits making them.
The TT fan is hard-anodized aluminum with some performance improvements and the last fan one will buy.
FYI,....its not interchangeable with the N/A version; one also needs the TT shroud to make it work.
Originally Posted by Steve Weiner-Rennsport Systems
We do make 993TT fans since Porsche has discontinued that part but as Chuck said, I won't tackle the 3.6 N/A fans unless the Factory quits making them.
The TT fan is hard-anodized aluminum with some performance improvements and the last fan one will buy.
All, many thanks for your thoughts and suggestions - sorry I haven't posted earlier, but... work
The shop has inspected the fan and shroud, but weren't able to find any obvious culprit. I will naturally not run the car with this fan - I'll but a new one, and in the meantime I'll run the replaced fan, who has a small crack, but is otherwise ok. I kind of regret now having replaced it with the one that broke ))
Anyway, one question - do I need to replace the shroud as well? The blades in the shroud have been 'pinched' a bit where the broken blades/material from the fan have hit it while being still spun by the fan.
The reason I'm asking is because a new shroud costs an arm and a leg - normally it should still work, but I wonder how the small pinches affect the airflow on top of the engine.
11-05-2018, 11:33 AM
Massive Engine Fan Failure - Any Ideas as to the Cause?
