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Join Date: Aug 2012
Posts: 74
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Fan scrape
87 3.2. Fan once in a while scrapes the housing on the bottom. Done this very seldom since I bought it 3 yrs ago. Then the alternator went bad and I just replaced it with a pp rebuilt. Now the fan scrapes even more. It only does it when you have driven awhile, shut the engine off, wait 5 mins or so and crank it and start. It scrapes for 15 seconds, then stops. Any thoughts on how to fix this. It's the original fan and housing.
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08-22-2013, 06:10 PM
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Member 911 Anonymous
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When off the car doesit bind? Which belt are you using and how many shims in and out?
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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08-22-2013, 06:13 PM
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Registered
Join Date: Jul 2005
Location: Atlanta, GA
Posts: 268
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Make sure the fan housing is seated properly. Sometimes its tricky to get it seated just right.
May want to make sure the fan belt is not too tight. Quote:
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08-22-2013, 06:29 PM
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Registered
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Location: Southern California
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Quote:
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1984 Targa |
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08-22-2013, 06:44 PM
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Make sure your fan strap isn't too tight. I do t have the spec in front of me, but IIRC it was quite light.
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Ken 1986 930 2016 R1200RS |
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08-22-2013, 06:57 PM
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Location: seattle, WA
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Did you check to see if the fan housing is cracked? If it is maybe when you tighten down, you may have squeezed it and now its out of round
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ken 87 targa |
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08-22-2013, 07:29 PM
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Join Date: Sep 2001
Location: New England
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The fan housing mounting strap allen bolt tightening torque is 18 ft lbs per Bentley.
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08-22-2013, 07:31 PM
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Registered
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A few tens of thousands of miles ago mine would scrape where I had a bubble in the magnesium housing - took it apart and sanded the bubble down and it's been all good since.
Chuck.H '89 TurboLookTarga, 362k miles |
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08-23-2013, 05:20 AM
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Registered User
Join Date: Aug 2012
Posts: 74
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Thanks guys
I'm using a porsche belt with 3 shims inside and outside Pretty sure I put the alt into the housing ok Might have the strap bolt over tight or the housing is out of round? I'll try to move one shim to the outside on the belt and do 18 ft lbs on the strap Thanks all |
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08-23-2013, 03:53 PM
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Location: Usa
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Take the belt off and make sure the alternator is secure on the mount. If the bolts securing the alternator to the assembly are loose, it will rub. Next, make sure the alternator itself does not have play in the shaft.
If none of the above suggestions help (not just mine - the others are excellent points) then you may have to just take it apart and examine it. These housings can crack and it does change where the fan and alternator sit in relation to the lower part of the housing. angela
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08-23-2013, 04:24 PM
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Registered User
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Agreed. I'm going to pull it out and check things carefully. Including checking cracks and out of round.
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08-23-2013, 06:03 PM
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Registered
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+1 on your last post--great plan to check for cracks and out of round. Also look for scrapes in the inside of the fan housing, especially where you think its rubbing. A failure could be catastrophic.
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1987 911 Carrera Cabriolet (sold) 2009 Prius (daily driver--keeps me sane) 2011 Mercedes GLK350 (wife's car) 2002 Volkswagen Beetle Turbo S (son's car--keeps wife sane) |
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08-23-2013, 06:25 PM
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The Bavarian
Join Date: Mar 2012
Location: Pfaffenhofen/Bavaria/Germany
Posts: 247
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After cleaning up my fan and housing and re-installing everything, the fan touched the housing at the lower part. When running the engine, it was clearly audible. I dis-assembled it again but couldn't find anything. Same thing after re-assembly. Then I loosened the belt by putting one more shim on the inside of the pulley and the interference was gone.
- Manfred |
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08-23-2013, 09:38 PM
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Registered User
Join Date: Aug 2012
Posts: 74
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Who would think one shim would do the trick! I'm trying that first for sure. If not, then it's all comes apart for crack and roundness.
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08-24-2013, 07:15 AM
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Join Date: May 2004
Location: Boulder, Colorado
Posts: 7,275
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The cracks I think you will look for, if you have to do that, are probably in one or more of the "arms" which connect the alternator mounting part in the middle out to the circumferential housing of the whole assembly.
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08-24-2013, 10:24 AM
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Registered User
Join Date: Aug 2012
Posts: 74
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Ok moved one shims inside and re tightened the strap bolt to 18 ft lbs. will try it tonight. Too hot now in Dallas today. Will let you know
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08-25-2013, 07:08 AM
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Registered User
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Quote:
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Dustin |
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08-25-2013, 08:21 AM
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Registered User
Join Date: Aug 2012
Posts: 74
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Bentleys shows the Allen strap bolt at 18 ft lbs. so which one is correct?
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08-25-2013, 08:30 AM
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6 cylinder symphony
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Yer worrin' too much. Get a short wrench and snug it down tight. It'll be fine.
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'84 3.2 Targa '89 964 Coupe "What do you mean NEXT project?" - my wife |
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08-25-2013, 09:35 AM
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Seat the alternator without the front fiberglass cone first using the 6 nuts. Once its seated, remove the nuts and re-install the cone.
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08-25-2013, 05:14 PM
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Marble Grey
911 Turbo
2014 
1987 Porsche 911 Carrera Cabriolet
Hester
