 Fan Belt Help |
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| Ken Mikos |
 Aug 22 2021, 07:31 PM
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#1
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Newbie  Group: Members Posts: 28 Joined: 20-February 14 From: Pgh Member No.: 17,024 Region Association: None  |
Just put a new fan belt on, it jumped off the pulleys twice as I was driving after about 10 miles.
The old belt had inner cogs and the new belt has outer cogs. Will that make a difference? I made sure the belt was tight the first time and probably over tightened it the second time as I had only about a 1/4” of flex. Any suggestions would be appreciated. Thanks |
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| windforfun |
Aug 22 2021, 07:33 PM
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#2
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Senior Member Group: Members Posts: 1,823 Joined: 17-December 07 From: Blackhawk, CA Member No.: 8,476 Region Association: None |
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| Ansbacher |
Aug 22 2021, 08:00 PM
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#3
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Senior Member Group: Members Posts: 689 Joined: 4-July 14 From: Tampa Bay, Florida Member No.: 17,589 |
I thought Ken's use of the word "cog(s)" was appropriate and descriptive. Maybe not technically correct, but I understood what he meant in relation to a fan belt.
Ansbacher |
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| jcd914 |
Aug 22 2021, 09:17 PM
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#4
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Advanced Member Group: Members Posts: 2,081 Joined: 7-February 08 From: Sacramento, CA Member No.: 8,684 Region Association: Northern California |
Check the alignment of the alternator pulley and fan pulley.
I have also heard of the lower alternator bracket breaking. Don't worry about the cogs. Jim |
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| PanelBilly |
Aug 22 2021, 09:50 PM
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#5
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914 Guru Group: Members Posts: 5,811 Joined: 23-July 06 From: Kent, Wa Member No.: 6,488 Region Association: Pacific Northwest 
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check the pully for bends. A small kink can throw the belt
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| bdstone914 |
Aug 22 2021, 09:59 PM
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#6
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bdstone914 Group: Members Posts: 4,531 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
@Ken Mikos
What brand and part number did you buy? What is the size marked on it? I have never seen the type of belt you describe on a 914. |
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| iankarr |
Aug 22 2021, 10:05 PM
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#7
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The wrencher formerly known as Cuddy_K Group: Members Posts: 2,480 Joined: 22-May 15 From: Heber City, UT Member No.: 18,749 Region Association: Intermountain Region
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(IMG:style_emoticons/default/agree.gif)
Could it be the belt is inside out? I've also had belts thrown when the alternator pulley was cracked / broken. Def worth a check. |
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| Shivers |
Aug 23 2021, 02:42 AM
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#8
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Senior Member Group: Members Posts: 2,410 Joined: 19-October 20 From: La Quinta, CA Member No.: 24,781 Region Association: Southern California |
Cog is correct according to this guy, I've also heard them called cog belts. Don't over tighten the belt, alternators are not cheap. The "cogs" allow it to bend easier around a small pulley. You may have it so tight that the belt is getting hot and being pushed up and out of the pulley
https://www.youtube.com/watch?v=zH1RRx2j9SM |
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| bdstone914 |
Aug 23 2021, 07:28 AM
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#9
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bdstone914 Group: Members Posts: 4,531 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
@Ken Mikos
Dud the original belt have the sane oribkem? If si the pulleys are probably ok. But check them anyway and check the brackets. It does not make sense why the belt cogs are on the outside. They are meant to allow the belt to go around small pulleys. At this piint i would get a different belt. |
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| Ken Mikos |
Aug 23 2021, 02:10 PM
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#10
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Newbie Group: Members Posts: 28 Joined: 20-February 14 From: Pgh Member No.: 17,024 Region Association: None |
Thanks for all the constructive comments.
Checked the Alt Pully, no play or bends and the Alt Bracket is fine. The newer belt that spun off has the same ID #15380 but is slightly different than the old belt as described earlier. To remedy the issue I temporally installed the old belt and placed an order for a Conti 10X965 which has the cogs on the inside. Will keep you all updated on this bizarre issue. Ken |
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| Quinn Moore |
Aug 23 2021, 04:45 PM
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#11
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Qmoore Group: Members Posts: 108 Joined: 13-July 21 From: Fox River Grove, IL Member No.: 25,718 Region Association: Upper MidWest
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QUOTE(Ken Mikos @ Aug 23 2021, 03:10 PM)  Thanks for all the constructive comments. Checked the Alt Pully, no play or bends and the Alt Bracket is fine. The newer belt that spun off has the same ID #15380 but is slightly different than the old belt as described earlier. To remedy the issue I temporally installed the old belt and placed an order for a Conti 10X965 which has the cogs on the inside. Will keep you all updated on this bizarre issue. Ken I had "roughly" the same issue. My belt that broke had the the cogs on the outside. Very narrow though (VW?). Anyway I was far from home and went to local advance auto, found a dayco under Volkswagen. Came off.. pulled over, really tightened it up and got me home. Then bought the correct belt from autoatlanta.com. continental. Cogs on the inside, correct 10x965. All good. |
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