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Join Date: Sep 2007
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Changing Belt on 1986 911 Carrara ?
My belt busted on my 1986 911 Carrara. Its the internal belt that runs the fan, not the alternator belt. Is there a diagram or instructions on this site how to change the belt ?? It looks tough to get to and Im not sure it the alternator belt has to come off first. Any help would be greatly appreciated ! What does this belt do ??
(My 911 has 300,000 miles on the original Motor and running killer !) 
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06-03-2009, 07:33 AM
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Join Date: May 2002
Location: St Louis
Posts: 4,211
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 Do you have the tool kit in the trunk? Remove the nut, count the spacers on each side, put the belt back on and if it is too tight shift a spacer from outside the pulley to inside.The alternator is behind the fan. The other belt goes to the AC. Don't run it without that belt.
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Rick 88 Cab |
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06-03-2009, 07:38 AM
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Location: Tucson
Posts: 914
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The internal belt runs both the fan and the alternator. THe external belt runs the AC compressor and yes it will have to come off.
Do a search on replacing the fan belt. It's not hard to do, but there are some things unique to the set up - like using all of the shims for adjustment. I think there's also a writeup in the tech articles section.
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1986 Carrera Coupe 1999 Chevy Tahoe 1987 Chevy Blazer 1955 Chevy Apache 3100 Pickup "A little knowledge is a dangerous thing" |
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06-03-2009, 07:44 AM
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86 Carrera Coupe
Join Date: Apr 2008
Location: Holyoke, Massachusetts (western end of state)
Posts: 425
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The above is all correct. There are 6 shims (thin washers) that need to go back on. Count the number between the pulley halfs and the number between the nut and the outer pulley half and replace the same way with new belt. If tension is to loose take some from between the pulleys and add them to the outside (between nut and pulley). Drive it a little first and check the tension most times a second adjustment (tension) is required for a new belt. I beleive there should be only a half inch deflection on the middle of the belt when pressing on it with your finger. Yes the Ac compressor belt needs to come off, just loosen the 4 bolts on the compressor mount and then loosen threaded adjusting bolt and slide compressor to left and belt will come off and then the fan/alternator belt is accessible. Pretty easy job and Bentleys and 101 both explian it well as does this forum.
http://www.pelicanparts.com/techarticles/911_volt_reg_replace/911_volt_reg_replace.htm |
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06-03-2009, 08:06 AM
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Ken 06 Cayman S - gone 85 911 Targa - gone back home to Germany 73.5 911T Targa - long gone... Founder ncPOG: nevada county Porsche Owners Group - disbanded post covid after 15 yrs |
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06-03-2009, 08:49 AM
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Be damned sure you don't get it too tight or you'll be looking at new alternator bearings down the road...
Doyle
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Recording Engineer, Administrator and Entrepeneur Designer of Fine Studios, Tube Amplifier Guru 1989 Porsche 911 Carrera Coupe 25th Anniversary Special Edition Middle Georgia |
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06-03-2009, 02:21 PM
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Location: SF Bay Area
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The Bentley manual says 5mm (less than 1/4") deflection for the fan/alternator belt. Wayne's book says 1/4-1/2". Which one is right?
Re the AC...What is the recommended deflection on the AC compressor belt? Bentley says nothing about it. |
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10-19-2017, 10:25 AM
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Just make it nice and firm. If there's no squealing, you're good.
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1986 Bosch Icon Wipers coupe. |
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10-19-2017, 11:41 AM
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Right on the Pelican Home Page
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1958 356A - Sold to a rust collector 1978 924 - sold to a sewing machine repairman 1984 944 - meticulously maintained but everything except the drivetrain self-destroyed. Used in trade for my wife's MB 1988 Carrera 3.2 Targa - purchased in 1992 and still thriving. Boy, do I love this car |
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10-19-2017, 11:41 AM
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Get off my lawn!
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It is sometimes a pain to find a replacement belt that is really the right size. Make sure none of the old belt pieces were sucked into the fan. If they were, they are on top of the cylinder cooling fins. Not a good thing. Look around with a flashlight behind the fan.
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Glen 49 Year member of the Porsche Club of America 1985 911 Carrera; 2017 Macan 1986 El Camino with Fuel Injected 350 Crate Engine My Motto: I will never be too old to have a happy childhood! |
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10-19-2017, 11:54 AM
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Join Date: Oct 2008
Location: Denver, CO
Posts: 3,494
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ron, if your ac no longer blows cold, you can snip (and leave off) the ac belt to make replacing the fan/alternator belt easier. You may also have a spare (but quite old) alternator/fan belt in your tool roll
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10-19-2017, 12:23 PM
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Cars and Cappuccino
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Use the half moon looking wrench in the toolkit to hold the fan while you break the nut free. And use it again to tighten it up. 22mm socket size (7/8 in a pinch). Good luck.
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http://www.carsandcappuccino.com 1987 Grand Prix White "Outlaw" Turbo Coupe w/go-fast bits 1985 Prussian Blau M491 Targa 1977 Mexico Blue back-dated,flared,3.2,sunroof-delete Coupe 1972 Black 911 T Coupe to first factory Turbo (R5 chassis) tribute car (someday) |
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10-19-2017, 04:42 PM
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Location: Western Mass
Posts: 418
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Looks like Ron has been gone awhile.
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1986 Carrera coupe - black on black 1972 CB500/4 |
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10-19-2017, 05:13 PM
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Cars and Cappuccino
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Quote:
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10-19-2017, 05:22 PM
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Join Date: Jan 2010
Location: SF Bay Area
Posts: 503
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Belt tensioning is critical as too little there's fan/alternator slippage and too much, alternator bearing damage. I saw no mention of AC compressor belt tensioning either. No one really knows? |
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10-21-2017, 07:53 PM
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1985 Porsche 911 Targa 3.2
2006 Cayman S
1988 Porsche 3.2 Targa
2012 Mini S
Carrera
