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Old 09-12-2012, 04:42 PM
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belt squeal

I know this topic has been covered in depth. I have spent a couple hours reading and several more hours trying to figure this out. 400 hp SBC. I CANNOT get rid of the squealing belt that goes from the crank, around wat pump to alt. I know it is this belt as I have taken the others off. The squeal is not constant, it seems to occur mostly on deceleration. I have tried: different belt, different alt, different bracket system, TIGHT belt, loose belt. I have an edelbrock high volume water pump. I am wondering if this pump overcomes the belt since there is not a lot of belt coverage on the water pump pulley. ANy help is greatly appreciated. I to attached PICS. The pulleys are aligned. GM pulley on the crank and the water pump.
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Old 09-12-2012, 05:07 PM
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Try some of this. Spray it into the pulley groove while it's running.
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Old 09-12-2012, 05:50 PM
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How old are the pulleys? What brand of belt?

You could try taking the belts off and rubbing the inside groves of the pulleys with steel wool.
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Old 09-13-2012, 06:15 AM
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The pulleys are late 70s GM. The two belts I used are the Dayco top cog pictured 15445 and an Atlas 5445. The Atlas was slightly wider, no difference.
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Old 09-13-2012, 07:38 AM
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If it's not out of the budget, try gates belts---i think it will be about $11-12.

If that does not work it may be time to get new pulleys or live with it.
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Old 09-13-2012, 08:54 AM
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belt squeal

I ran into the same problem when I replaced belts on my daughter's car. I bought the Dayco belts from Advance Auto. As soon as I started the engine I could hear the belt squeal. Not real loud but annoying. I took the belt back but they didn't have another brand. I got my money back and went to Auto Zone. I told the salesperson the problem I had. The carry the Goodyear brand belts. Gatorback I believe it was called. Solved the problem. Later I made a mistake and purchased another Dayco belt for a Jeep Cherokee that had the same annoying squeal.
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Old 09-13-2012, 10:43 AM
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Quote:
Originally Posted by Dmgarage View Post
I know this topic has been covered in depth. I have spent a couple hours reading and several more hours trying to figure this out. 400 hp SBC. I CANNOT get rid of the squealing belt that goes from the crank, around wat pump to alt. I know it is this belt as I have taken the others off. The squeal is not constant, it seems to occur mostly on deceleration. I have tried: different belt, different alt, different bracket system, TIGHT belt, loose belt. I have an edelbrock high volume water pump. I am wondering if this pump overcomes the belt since there is not a lot of belt coverage on the water pump pulley. ANy help is greatly appreciated. I to attached PICS. The pulleys are aligned. GM pulley on the crank and the water pump.
I have a similar set up on the 350 in my S15 which did the same thing when I installed the Edlebrock water pump with aluminum pulleys when operated only with a single belt as you have. When I put the inboard belt on that runs only between the the crank and pump the problem went away. It appears the high volume Edlebrock is more resistant to rotational speed changes to where a single belt just doesn't provide enough grip in these situations.

At this point your pulleys may be glazed so when you take this apart it will be a good idea to lightly sand the inside of the grooves so there is some "tooth" for the belt to bite into.

Bogie
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Old 09-13-2012, 11:50 AM
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thanks Bogie, this is the same truck I was having the cooling issue with. I got a Griffin rad 31"x19 2 rows of 1.25 tubing. that should solve that. When its apart Ill clean up the pulleys & try new gates belts. I had another belt that ran from the crank around the water pump around the power steering and to the ac compressor on the other side. I still had the squeal then too. I had taken it off before I took the pic trying to isolate the problem
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Old 09-13-2012, 12:24 PM
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i might add that i had the same/similar problem and got a gates replacement and problem basically went away.

Before i would rub the belt and pulley with soap and that would work for a few mins, but then it would come back.
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Old 09-13-2012, 04:09 PM
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Your alternator could be flexing with that type of bracket also. JMO



Cole
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Old 09-13-2012, 06:21 PM
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Thanks for the reply. I don't think it is though. You can watch it when you rev the engine and it doesn't appear to move. I was originally using the stock bracket on the top. I switched to the threaded tubing with the rod ends to make it easier to get the belt tighter. We have been using the adjustable rod for years in race applications without an issue.
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