|
|
|
|
| Author |
|
|
Registered
Join Date: Feb 2006
Location: parkland,florida
Posts: 10
|
loose alternator belt
need help in finding out why the altn. belt keep getting loose even with new belts and down to the last washer, would it be something with the pulleys? suggestions
appreciated.its a 86 911 |
||
10-10-2010, 07:07 AM
|
|
|
Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,079
|
pic please ?.....you add and remove shims from behind the pulley......
__________________
D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
||
|
10-10-2010, 07:13 AM
|
|
|
Registered
Join Date: Jun 2009
Location: Manhattan Beach, California. Factory Delivery-Original owner-Retired engineer
Posts: 5,238
|
Quote:
On our '86 we have three shims between the pulley halves, and three shims under the cup. All six shims must be installed in either locations. Alternator belt Part #999 192 176 50. 9.5 X 710 mm. Good luck, Gerry
__________________
1986 911 Targa. Per Road and Track magazine: Only in L.A.: In the window of a bar in Hermosa Beach, California. "Happy Hour prices during all car chases." Last edited by 86 911 Targa; 10-10-2010 at 07:50 AM.. |
||
|
10-10-2010, 07:47 AM
|
|
|
Forced Induction Junkie
|
Sounds like the sides of the belt are wearing due to shims. There should be a total of 6 shims in the alternator/fan pulley assembly. These shims are used to get proper belt tension, but also to maintain the proper plane relationship between the crankshaft pulley and the alternator/fan pulley. If there are less than the required 6 shims, the relationship between the crankshaft pulley and fan pulley will be out of whack and you'll see accelerated belt wear.
To adjust the proper belt tension, you add or subtract the appropriate shims from the inside of the pulley half and put them on the outside of the pulley cup.
__________________
Dave '85 930 Factory Special Wishes Flachbau Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P |
||
|
10-10-2010, 07:52 AM
|
|
|
Registered
Join Date: Jul 2001
Location: mt. vernon Wa. USA
Posts: 8,713
|
Is it possible that your fan pulley half has worn into the the mating portion of the fan. I have seen a groove worn into the fan side that then allows the pulley half to slide into it. It then becomes off-center and appears to be a loose fan belt, with the associated belt vibration, etc.
This is usually the result of over tightening the belts. Regards, al
__________________
[B]Current projects: 69-911.5, Previous:73 911X (off to SanFrancisco/racing in Germany).77 911S (NY), 71E (France/Corsica), 66-912 ( France), 1970 914X (Wisconsin) 76 911S roller..off to Florida/Germany RGruppe #669 http://www.x-faktory.com/ |
||
|
10-10-2010, 09:21 AM
|
|
|
Registered
Join Date: Feb 2006
Location: parkland,florida
Posts: 10
|
thankyou for all your response,i have six shims and is ajusted to the max after 3 runs then i changed to a new belt ,getting loose,move the shims until the max then its loose again.two different shops couldnt fix it.
|
||
|
10-10-2010, 05:35 PM
|
|
|
|
Forced Induction Junkie
|
Guess it's time to pull the fan, alternator and fan housing off the engine. First thing to check for is a worn rear bearing on the alternator, followed by checking the fan and fan housing for cracks.
__________________
Dave '85 930 Factory Special Wishes Flachbau Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P |
||
|
10-10-2010, 06:25 PM
|
|
|
Registered
Join Date: Feb 2006
Location: parkland,florida
Posts: 10
|
thankyou
|
||
|
10-10-2010, 07:40 PM
|
|
1985 Porsche 930 Fac. Slantnose 3.3l
