|
|
|
|
| Author |
|
|
Registered
Join Date: Oct 2001
Location: San Carlos, CA US
Posts: 5,523
|
Fan touching housing,
My 911SC (11-blade fan) very slightly touches the fan housing at the bottom left hand side (wear marks). While I was replacing the belt I noticed that the fan has a little radial play. What's the cause, and what's the cure?
__________________
Porsche 2005 GT3, 2006 997S with bore-scoring Exotic: Ferrari F360F1 TDF, Ferrari 328 GTS Disposable Car: BMW 530xiT, 2008 Mini Cooper S Two-wheel art: Ducati 907IE, Ducati 851 |
||
12-10-2003, 07:09 AM
|
|
|
Registered
Join Date: Jan 2002
Location: I'm out there.
Posts: 13,084
|
Your alternator bearings are shot. Replace them FAST. A little play becomes a lot of wiggle in a hurry. If the bearings are not fixed in time, the wobble will ruin the brushes in the alternator and you'll get to replace that, too! (Ask me how I know!)
__________________
My work here is nearly finished.
|
||
|
12-10-2003, 07:18 AM
|
|
|
GAFB
Join Date: Dec 1999
Location: Raleigh, NC, USA
Posts: 7,842
|
Two potential causes -
More common: Worn-out bearings in the alternator (replace alt). Due to the radial play you mentioned, sounds like your winner. Less common: Cracked/deformed fan housing (caused by over-torquing housing strap; requires replacement of housing).
__________________
Several BMWs |
||
|
12-10-2003, 07:19 AM
|
|
|
Registered
|
I had that problem. I first had the alternator bearings replaced, but that didn't solve it. So, I took a Dremel tool and removed a little of the housing where the fan was hitting. No more noise!
__________________
Steve Wilwerding 1998 3.4L Zenith Blue Boxster 2009 Meteor Gray Cayenne |
||
|
12-10-2003, 07:21 AM
|
|
|
It'll be legen-waitforit
Join Date: Jan 2002
Location: Calgary, Canada
Posts: 6,994
|
The fan rides on the alternator shaft, it could be time for an R/R of the alternator. Check the bearings and have it all refurbished while it's out.
Cheers
__________________
Bob James 06 Cayman S - Money Penny 18 Macan GTS Gone: 79 911SC, 83 944, 05 Cayenne Turbo, 10 Panamera Turbo |
||
|
12-10-2003, 07:21 AM
|
|
|
Schleprock
Join Date: Sep 2000
Location: Frankfort IL USA
Posts: 16,639
|
Another possibility is that the alt. is not seating squarely in the fan housing. This would explain the rubbing in only one location?
Just a guess here. If the alt. bearings were shot (which it seems like they are since there's some radial movement), would there be rubbing in more than one location? But since the belt is pulling the alt. in one direction all the time.......... maybe rubbing remains isolated to one place. Just throwing some things out there to think about. Whatever the case may be, a removal of the fan/alt./housing combo. is inevitable.
__________________
Kevin L '86 Carrera "Larry" |
||
|
12-10-2003, 08:35 AM
|
|
|
|
Registered
Join Date: Oct 2001
Location: San Carlos, CA US
Posts: 5,523
|
I was planning on dropping the engine to clean and seal it, plus to do other tidying work in January. It seems this will now happen even sooner. Thanks.
__________________
Porsche 2005 GT3, 2006 997S with bore-scoring Exotic: Ferrari F360F1 TDF, Ferrari 328 GTS Disposable Car: BMW 530xiT, 2008 Mini Cooper S Two-wheel art: Ducati 907IE, Ducati 851 |
||
|
12-10-2003, 08:44 AM
|
|
1981 Porsche 911SC Euro 3.0
Boxster 3.4
