Metal to metal noise - help

Plethora · 10-14-2004, 12:54 PM

1991 C2 Cab - Replaced alt and fan belts, everything bolted back together fine. Now have intermittent noise, metal on metal and sounds like the fan hitting the shroud, but there are no marks at all on either one. Any ideas what it could be? I can't drive it like this.
Any help appreciated.

Rot 911 · 10-14-2004, 01:04 PM

you either have adjusted the fan belt too tight, or you have cracks in your fan housing and when you tightened up the fan housing strap you made the fan housing oval shaped. Try loosening up on the fan strap and, if that doesn't solve the mystery, then the fan belt.

Zeke · 04:02 PM

Kurt, you always have good advice, but did he necessarily loosen the fan strap?

EDIT: I really wanted to know. I don't know if this is a stupid question. You see, I know that the 996 engine has an external alt. Don't know when Porsche started that. So, when he says he replaced the alt and fan belts, you can read that 2 ways.

MotoSook · 10-14-2004, 02:08 PM

If the alternator wasn't seated right (torquing down the nuts to seat it), it will be cocked, resulting in a cocked fan, resulting in the rubbing....

Best to check the work over again.

bell · bell's Garage

check that the crank pulley isn't scraping on the fan housing.....it took me a few tries to get mine to seat properly.
there is a "pin" the housing sits in on top of the engine case....if it doesn't go on properly it's work it's way closer and closer until it hits the crank pulley.