Accessory Belt Issue....... Help! *******UPDATE******
#2485419
04/20/18 02:13 AM
04/20/18 02:13 AM
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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
OP
master
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OP
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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My car runs the stock pulley & belt setup. I’ve had the car for 12 years, and never had a belt issue, nor replaced a belt up until last fall when it threw the water pump / alt. belt on what was the last pass of last year. I figured it was just time, as the belt was who knows how old. I replaced the belt and it saw a few street miles last fall before tearing the top end down to have the heads worked on over the winter. All recently went back together once again with the bracketry and pulley setup no different than it has been since I’ve owned the car. I am completely confident that the belt was tight.
Today I pulled it out of the garage and took it for a short drive to put gas in it for the upcoming race weekend. I cracked into the secondaries once and felt and heard a rap under the hood. Pulled over........ yep, belt gone.
Anyone have any ideas on why the same setup that was rock solid for 50 years would suddenly start throwing belts? Alternator is solid as a rock. Water pump is solid and spins evenly. All pulleys appear to be in good repair. Could I be tightening the belt too much??
Last edited by StealthWedge67; 04/25/18 01:55 AM.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Accessory Belt Issue....... Help!
[Re: StealthWedge67]
#2485472
04/20/18 08:58 AM
04/20/18 08:58 AM
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Joined: Jan 2005
Posts: 4,243 Charlotte, North Carolina
sgcuda
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master
Joined: Jan 2005
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Charlotte, North Carolina
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Probably due to changes in belt manufacturing, may be wider than originally used. If you are not already using deep groove pulleys, a cheap way out is to match up an old air pump belt. They were narrower than a standard drive belt and will sit deeper in the pulleys.
[image][/image]
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Re: Accessory Belt Issue....... Help!
[Re: StealthWedge67]
#2485632
04/20/18 03:09 PM
04/20/18 03:09 PM
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Joined: Jan 2003
Posts: 4,335 Morrow, OH
markz528
master
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master
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Morrow, OH
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Check the basics. Are the pulleys excessively worn or cracked? You should check the pulley wear against a gauge - if you don't have one PM me and I will send you one - vendors give them away for free.
And check for pulley alignment - something may have moved.
67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......
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Re: Accessory Belt Issue....... Help!
[Re: StealthWedge67]
#2485647
04/20/18 03:49 PM
04/20/18 03:49 PM
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Joined: Jan 2003
Posts: 1,814 North Dakota
Azzkikrcuda
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,814
North Dakota
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I had this same problem. Had the belt on my car for years shifting at 6700rpms, hitting the rev limiter occasionally with no problems. Changing oil one day and noticed the bottom was missing some chunks. I put and new belt on of the same part number. First time out shifting it came off. I checked pulleys, mounts and tried a few different brands of belts, nothing worked, if I hit the rev limiter it would come off. Never did figure it out, I changed over to serpentine belt.
The only Carbs I care about are under the hood!
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Re: Accessory Belt Issue....... Help!
[Re: Cab_Burge]
#2485830
04/20/18 10:37 PM
04/20/18 10:37 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I'd be looking at a misalignment of at least 1 of the pulleys.. a belt just doesnt fly off on its own... could be even a bent belt usually caused by a pulley misalignment Try putting a straight edge on each one
Last edited by MR_P_BODY; 04/20/18 10:39 PM.
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Re: Accessory Belt Issue....... Help!
[Re: StealthWedge67]
#2486066
04/21/18 02:10 PM
04/21/18 02:10 PM
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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
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OP
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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Thanks for the tips guys! I’ll be out in the garage today going over this list. Hope I get it figured out.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Accessory Belt Issue....... Help!
[Re: StealthWedge67]
#2486070
04/21/18 02:22 PM
04/21/18 02:22 PM
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Joined: Feb 2014
Posts: 1,737 central il.
second 70
top fuel
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top fuel
Joined: Feb 2014
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central il.
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The 15470 belt worked best for my alternator and 15440 for power steering on my hemi.
15 means 15mm or 7/16 and the 47 or 44 is length of belt.
I bet just changing to this belt will fix your problem it did on mine.
Good luck
Mike
Last edited by second 70; 04/22/18 01:04 PM. Reason: correction
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Re: Accessory Belt Issue....... Help!
[Re: StealthWedge67]
#2487614
04/25/18 01:22 AM
04/25/18 01:22 AM
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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
OP
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OP
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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UPDATE:
I couldn’t find a local distributor of Dayco, so I went with a Gates belt, one size narrower than the book calls for. Then I also made an adjustment to the bracketry; although it looked straight, when I put a straightedge across the pulleys the alternator was a little proud of the crank and pump. So I moved it back slightly and reassembled.
Well, Either I fixed the alignment, the narrower belt worked, or (most likely) it was just a freak deal from the get-go, because I made 3 full passes on Sunday with no issues whatsoever.
Car went a new best as well, 11.321 @ 117.89; but that’s for another thread.....
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Accessory Belt Issue....... Help!
[Re: StealthWedge67]
#2487634
04/25/18 02:30 AM
04/25/18 02:30 AM
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Joined: Oct 2006
Posts: 1,266 New York, USA
Chargerfan68
pro stock
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pro stock
Joined: Oct 2006
Posts: 1,266
New York, USA
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Glad you got it sorted out. Congrats on your new best!!
1.50 60Ft. , 10.75@ 127MPH Hauling 3900 LBS.
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