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Author
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Topic: keep loosing my belt.
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70coupe
Gearhead Posts: 346
From: Toronto,Ontario,Canada
Registered: Aug 2000
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posted 06-04-2001 01:22 PM
  
I have a 351c and the belt that goes from the crank-alternator-fan pully keeps coming off. I've never had this problem until I changed the fan blade. I went from a this flex fan to a more stock style fan for more airflow. When the engine is around 4000 rpm the belt starts to curve, almost like the air from the fan is blowing it back. Any ideas?
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jkilroy
Gearhead Posts: 1703
From: Vicksburg, MS
Registered: Dec 99
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posted 06-04-2001 02:30 PM
Is the belt tensioned properly? If the air from the fan is actually blowing it back it has to be loose. Also make sure the belt is not bottoming out in the V groove, it should just touch on the side.------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"
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Hans olsson
Gearhead Posts: 290
From: Sweden
Registered: Apr 2000
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posted 06-04-2001 02:47 PM
Do you have the oem pulley on the crank? If so the speed of the belt can make it come off. Our belt came off nearly every pass last year  . Moroso has a nice pulley part number 64550 with 4" od. We will try it out this weekend  . It will slow the belt speed by 50%. It could help you too. Hans Olsson. ------------------
-71 351c Mustang E/SA 11.92-110 mph.
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SteveLaRiviere
Administrator Posts: 32961
From: Saco, Maine
Registered: May 99
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posted 06-04-2001 05:28 PM
I used to have the same problem with the 351C in my '72 every time I revved it over 6k. I never solved it, just kept popping the belt back on. {when I could find it}------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.50 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC {Wife's car...}
All Fords since 1977
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70coupe
Gearhead Posts: 346
From: Toronto,Ontario,Canada
Registered: Aug 2000
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posted 06-04-2001 07:25 PM
I changed the fan to a flex-lite 400 (just for the hell of it) and put on a new belt and tried shimming the alternator a little to see if the pullies are maybe a little off. Let me know how the Morosso pully works?
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Hans olsson
Gearhead Posts: 290
From: Sweden
Registered: Apr 2000
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posted 06-11-2001 11:43 AM
We made six runs during the weekeend and the belt stayed on .The race ended in round one on a red light  .All i can say is buy the pulley! Hans.------------------
-71 351c Mustang E/SA 11.92-110 mph. [This message has been edited by Hans olsson (edited 06-11-2001).]
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70coupe
Gearhead Posts: 346
From: Toronto,Ontario,Canada
Registered: Aug 2000
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posted 06-11-2001 01:27 PM
Well, the belt stayed on after 9 passes.I shimmed the alternator and it seems to work. My best was 13.16@105 with a 3270lb car + 170 driver is 3440lbs. I want to run high 12's. Any ideas.
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