Alternator Belt Throwing - Team Camaro Tech
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post #1 of 20 (permalink) Old Apr 27th, 10, 08:25 AM Thread Starter
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Alternator Belt Throwing

I keep throwing and tearing up belts particularly on the Alternator. The most I've gotten out of a belt is about 50 miles. Iíve shimmed the water pump pulley, installed a new alternator bracket, and alternator, with no success.

I've noticed two things:

1) the alternator belt wines and sometimes sequels after a cold startup. The noise goes away if I spray the belt with CRC Belt Conditioner. I've been careful to tighten the belt as close to specs as I can gauge.

2) I'm seeing small pieces of rubber around the front of the engine. Also, after 15 to 20 miles of driving I'm seeing the belt start to fray on the edges.
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post #2 of 20 (permalink) Old Apr 27th, 10, 08:26 AM
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Re: Alternator Belt Throwing

way out of line on the alt?..unless thats just the way im looking at it?.the alt looks cocked a bit?

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post #3 of 20 (permalink) Old Apr 27th, 10, 08:37 AM Thread Starter
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Re: Alternator Belt Throwing

which way? Do you think the alternator is too far forward? I've attached pictures with a metal bar set in the pulley tracks for better reference.
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post #4 of 20 (permalink) Old Apr 27th, 10, 08:47 AM Thread Starter
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Re: Alternator Belt Throwing

Alignment pic 1
Alignment pic 2
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post #5 of 20 (permalink) Old Apr 27th, 10, 08:59 AM
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Re: Alternator Belt Throwing

Picture #2 looks like that chrome/aluminum 3" spacer needs to be cut down 1/4 inch. The alt looks like its tipped up-wards and in-wards.

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post #6 of 20 (permalink) Old Apr 27th, 10, 09:14 AM
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Re: Alternator Belt Throwing

use a straight edge against crank pulley to the alternator.
hold straight edge against both sides of crank pulley.
match up alternator to meet the straighedge.
or get a cog belt system like i got from black mountain precision.
http://www.blackmountainprecision.com/


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post #7 of 20 (permalink) Old Apr 27th, 10, 10:00 AM
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Re: Alternator Belt Throwing

Another method to align pulleys is to remove the belt and place a 1/4" wood dowel about 6-10" long in the groves. Push into the pulleys and hold in place with a finger. It will point exactly to where the belt is told to go by that pulley. Check top and bottom of all pulleys that the belt runs in. If perfect, get deeper pulleys. But the chances of your pulleys being perfect, are, slim.
Harry, nice setup!
Oh, forgot. Rubber thrown from the belt can indicate overloading regardless of alignment. Overloading can be caused by an alternator running at full-field. Another thing to try is to keep tightening the belt until it stops squealing. Might work. Won't hurt to try.

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post #8 of 20 (permalink) Old Apr 27th, 10, 01:25 PM
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Re: Alternator Belt Throwing

Are you sure that the belt profile matches the V profile of the pullys?
Do not over tighten belts.
I Run my alternator/water pump belts a little slack, engough to squweell around 5500 rpms
This takes the side load off the water pump bearing which is the usual fail of the water pump.
If going to hoon up I nick up the belts a little

I can tell very clear from the picks, but shouldnt the power sterring and the AC have duel belts?
And when buying belts to be used together make sure the manufacturing batch number is the same, so you have a 'matching' pair.

My Spelling is not incorrect...it is creative

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post #9 of 20 (permalink) Old Apr 27th, 10, 01:52 PM
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Re: Alternator Belt Throwing

I had an issue with the same thing and went to a thinner belt... 7500 and no issues

What belt (size) are you running ?

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post #10 of 20 (permalink) Old Apr 27th, 10, 02:27 PM
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Smile Re: Alternator Belt Throwing

I know the belt is out of alignment, but it could also be a problem with the alt. I had a 70' chev. p/u that kept snapping one of the mounting bolts off even GRD8 bolts. I spun the alt. no noises. 2 days later it snapped another bolt. I swapped alt's, problem went away. I think one or both brgs. were seizing momentarily and snapping the bolt which threw off the belt at 65-70mph
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post #11 of 20 (permalink) Old Apr 27th, 10, 02:46 PM Thread Starter
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Re: Alternator Belt Throwing

Thanks for the great advice everyone.

I used the wooden dowel trick and the alternator appeared to be a little too far forward. I trimmed the spacer, put a new belt on and fired her up. After about 5 minutes of idling i rechecked the tension and noticed rubber dust on the Alternator and water pump housing. A closer look at the belt appears that it's tighter on the engine side then the radiator side and the belt is showing wear on that side. The alternator appears to be on a sloping angle where the front (radiator side) is higher. Problem is I have no idea how to adjust this angle because the lower alt bracket has 2 bolts that mount to the water pump and set the angle. Any ideas on how to level the alternator out?

I'm running a Dayco 15460 (11A1170) Top Cog belt and the alternator and all pulleys are new.
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post #12 of 20 (permalink) Old Apr 27th, 10, 03:03 PM
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Re: Alternator Belt Throwing

The factory brackets are designed to align the pulley correctly with it's mates. It's possible that aftermarket brace is hindering alignment. The pulleys must be aligned in all ways, not just front to back as you have found.
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post #13 of 20 (permalink) Old Apr 27th, 10, 05:10 PM
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Re: Alternator Belt Throwing

Quote:
Originally Posted by nghtrn99 View Post
Thanks for the great advice everyone.

The alternator appears to be on a sloping angle where the front (radiator side) is higher. Problem is I have no idea how to adjust this angle because the lower alt bracket has 2 bolts that mount to the water pump and set the angle. Any ideas on how to level the alternator out?
Try using washers between the alternator bracket & water pump or between the alternator bracket & the alternator.

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post #14 of 20 (permalink) Old Apr 27th, 10, 06:31 PM
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Re: Alternator Belt Throwing

I've got the same kit so I wonder if I might run into the same problem.

Looks like that heim joint may be allowing it to tilt out. Maybe something more rigid would help? Like a bracket instead?

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post #15 of 20 (permalink) Old Apr 28th, 10, 06:39 AM
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Re: Alternator Belt Throwing

does the alternator bolt go into the head?
if so It might be the cause which was my problem
(head bolt wasnt taped square and caused alternator to become slightly cocked)
a 20 buck allen grove bracket fixed it!
bolts to the waterpump.


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