Belt squeal
Thread Starter
Instructor
Joined: Sep 2013
Posts: 153
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Belt squeal
Ok guys, my belts were squealing when I first fired up the car a couple weeks ago. So... I replaced both belts. Problem solved, so I thought. Now when I get the car up to 75 they start squealing. Any ideas why? They seem to be tight with no play
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
Which engine? And is the water pump pulley 2 or 3 grooves?
Here is the AIM for 69 w/427- there is a belt that runs between the crank and water pump only- if it's missing it squeals.
Here is the AIM for 69 w/427- there is a belt that runs between the crank and water pump only- if it's missing it squeals.
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
That AIM picture should apply. I have p/n's for the belts for my 69. They may not apply to the 73.
Dayco 15325 Crank to Water pump
Dayco 15445 Crank to water pump to Power Steering
NAPA 25-08003 Power Steering to Alternator
Use caution if your setup has the crank to water pump belt without an idler pulley. Too lose and it still squeals, too tight and it eats the bearings in the water pump. You have to remove the fan to install.
Dayco 15325 Crank to Water pump
Dayco 15445 Crank to water pump to Power Steering
NAPA 25-08003 Power Steering to Alternator
Use caution if your setup has the crank to water pump belt without an idler pulley. Too lose and it still squeals, too tight and it eats the bearings in the water pump. You have to remove the fan to install.
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Team Owner
Joined: Jun 2000
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From: Southbound
Cruise-In II Veteran
Has your assembly instruction manual arrived yet? The AIM will show the correct belt routing for your car (Tim's pic is an AIM page) and will show the idler if one was used on your car.
Racer
Joined: Feb 2013
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From: carpentersville ill.
Melting Slicks
Joined: Sep 2011
Posts: 3,372
Likes: 215
From: Peoria Arizona
I fought this exact same issue and TimAT has hit your solution exactly.
Generally speaking - this issue is somewhat common after the removal of the AC compressor when the empty belt grooves (where the AC belt was) are not used. The AC belt grooves must be used - a crank to water pump belt is needed in it's place or you will get belt squeal. I tried different belts, widths, brands, new PS pump, etc. Nothing solved it until I ran that belt. No more squeal.
Generally speaking - this issue is somewhat common after the removal of the AC compressor when the empty belt grooves (where the AC belt was) are not used. The AC belt grooves must be used - a crank to water pump belt is needed in it's place or you will get belt squeal. I tried different belts, widths, brands, new PS pump, etc. Nothing solved it until I ran that belt. No more squeal.
Last edited by AdamMeh; Nov 24, 2013 at 10:30 AM.
Melting Slicks
Joined: Sep 2011
Posts: 3,372
Likes: 215
From: Peoria Arizona
Sanding the pulley grooves did help mine as well. They are 30+ years old and tend to get polished smooth (too smooth). Adding in a belt from the crank to the water pump also gave me a little peace of mind over just one belt on the water pump.
Race Director
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