Squealing belt issue - Team Camaro Tech
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post #1 of 15 (permalink) Old Jul 25th, 18, 02:43 PM Thread Starter
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Tony
 
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Squealing belt issue

I have aftermarket Classic Auto Air installed on my 350 in my 68 convertible.
The AC belt wraps around the water pump pully which is being turned by the crankshaft (with the alternator)
Whenever I turn on my AC, the compressor kicks on and the squealing is very loud and embarrassing. I tried to tighten the belt but then the fan would barely turn. I put the AC in so I could use it and now I cannot use it.

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post #2 of 15 (permalink) Old Jul 25th, 18, 03:25 PM
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Re: Squealing belt issue

How would tightening the belt stop the fan from moving?

Post a pic of your belt/pulley set up

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post #3 of 15 (permalink) Old Jul 26th, 18, 04:30 AM
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ray
 
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Re: Squealing belt issue

Compressor may be locked up.
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post #4 of 15 (permalink) Old Jul 26th, 18, 04:53 AM
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Re: Squealing belt issue

Quote:
Originally Posted by carcrazy615 View Post
Compressor may be locked up.
Agreed, it sounds like a bad compressor front bearing or a compressor clutch issue.
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post #5 of 15 (permalink) Old Jul 26th, 18, 05:35 AM
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Re: Squealing belt issue

As John suggests, a photo would help. Most A/C setups require the belt wrap around a good portion of the A/C compressor pulley to eliminate slip there. Is your belt wrapping around the A/C pulley or is the belt for the A/C compressor pulley just touching a small portion of the side of the pulley? You can run a water pump with minimal belt contact, but not a heavy load A/C compressor.

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post #6 of 15 (permalink) Old Jul 26th, 18, 11:35 AM Thread Starter
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Re: Squealing belt issue

Here are some pics of my set up...
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post #7 of 15 (permalink) Old Jul 26th, 18, 11:39 AM Thread Starter
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Re: Squealing belt issue

Pics
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post #8 of 15 (permalink) Old Jul 26th, 18, 01:23 PM
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Re: Squealing belt issue

No doubt the alternator belt is slipping because all the power to run the air and the alternator and water pump is going through just one belt. If you could run the a/c compressor belt around the crank pulley, that would take a lot of the load off of the alternator belt. Just my opinion. Take it for what it's worth.

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post #9 of 15 (permalink) Old Jul 26th, 18, 06:10 PM Thread Starter
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Re: Squealing belt issue

Quote:
Originally Posted by dyno jonn View Post
No doubt the alternator belt is slipping because all the power to run the air and the alternator and water pump is going through just one belt. If you could run the a/c compressor belt around the crank pulley, that would take a lot of the load off of the alternator belt. Just my opinion. Take it for what it's worth.
Here is my set-up:

AC compressor has its own belt to the water pump. The water pump and alternator share a belt that loops around crankshaft, the power steering has it's own belt around the crankshaft.
How should I change this set up?

Tony
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post #10 of 15 (permalink) Old Jul 26th, 18, 06:29 PM
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Re: Squealing belt issue

Quote:
Originally Posted by bondora68 View Post
How should I change this set up?
You would need to have a lower pulley that allows the ac belt to be driven off of the crankshaft as well as going around the water pump pulley. No doubt that would solve the squealing problem. I can't see the bottom pulley to see whether it has three groves or not. No matter, it needs that third groove to run the ac belt.
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post #11 of 15 (permalink) Old Jul 27th, 18, 05:42 AM
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Re: Squealing belt issue

If you've not already done so, I'd take a look at the AIM for your '68 and use the prescribed belt configuration for running an a/c compressor.

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post #12 of 15 (permalink) Old Jul 27th, 18, 07:01 AM Thread Starter
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Re: Squealing belt issue

Thank you to all!

Tony
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post #13 of 15 (permalink) Old Jul 27th, 18, 10:45 AM
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Re: Squealing belt issue

When you add AC you need to add another grove using an adapter pulley for the Crank.
The A/C compressor belt must also go around the Crankshaft, and The water pump.

that will solve your problem...
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post #14 of 15 (permalink) Old Jul 27th, 18, 11:28 AM
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Re: Squealing belt issue

CRG listing for 1968 pulleys ~ pdf

camaros.org/pdf/pulleys-68

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post #15 of 15 (permalink) Old Jul 28th, 18, 03:09 PM Thread Starter
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Re: Squealing belt issue

Quote:
Originally Posted by Pacecarjeff View Post
When you add AC you need to add another grove using an adapter pulley for the Crank.
The A/C compressor belt must also go around the Crankshaft, and The water pump.

that will solve your problem...
Yes! That is what I ended up doing. I got a longer belt and went around the crank and the water pump. I already had the extra groove on the crank pulley, I just put the AC belt on wrong. It works great now!
Thanks guys!

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