Fan blade hitting shroud

[Bass911sc]

Hi everyone I've had a problem with my fan blade hitting fan shroud for a while change the alternator twice the fan shroud once the fan blade once replaced center support on old blade change rear motor mounts before the alternator went bad I replaced it with same one changed fan belt to 710 mm instead of lager it was ok for a while then fan bladee started hitting the shroud ground the the shroud and fan blade slightly then went away only to return and continue hitting I loosened and tightened the air duct extension on alternator but it still hits. The crankshaft fan pulley look secure I'm not sure what else to do. Any help or idea would be appreciated.
Thanks

[john walker's workshop]

,,,,,,s and ......s are nice to use.

[PeteKz]

John is right. When our only method of communication is the written word, you must write clearly.

[rowingone]

the washer placement and number is important when reassembling the fan . . double check that you have the correct amount and placement.

[wgirardot]

Make sure the alternator is fully bottomed out in the housing using the nuts to pull it in all the way. Then, when putting backside air duct on, snug the nuts tight, but not too tight to crack the plastic



Bill

[sigchuck]

I went through this using a reproduction shroud and a high amp alternator with spacers, so many variables. I ended up having to use a few strips of aluminum tape (as suggested by another member) to shim the fan/alternator up in the housing (mine was hitting around 7 o’clock). I also think I tightened the alternator bolt at 12 o’clock first hoping that it would ensure the assembly up and away as much as possible. In any event, it took care of the rubbing and I haven’t had any issues since.

The air guides are fragile and I ended up having to rebuild the flange on mine. There is a blog run by Joe Engineer that has a great procedure outlined for this if yours is in bad shape.

[isby]

Just dealt with this issue after replacement of my old cracked housing with a genuine Porsche magnesium housing. Bill is certainly correct that you need to make sure that the alternator is bottomed out in the housing. After doing that, I still had a significant amount of scraping. My ultimate conclusion was that the housing was not machined to the correct specifications (confirmed by comparing measurements of old housing and new housing). And so I had to grind down the interior of the housing, install alternator, identify high spots, remove alternator, grind down, re-install alternator, etc., etc. After repeating this dance about a dozen times (with a few dozen expletives), I finally had a fairly uniform gap between all the fan blades and housing. The parts market for our cars ain't what it used to be. And don't even get me started on that air deflector!!