Problem with a screaming belt, (sigh) help - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 10 (permalink) Old 03-31-2010, 12:11 PM Thread Starter
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Problem with a screaming belt, (sigh) help

I cannot believe I have to ask for guidance on such an elementary problem. But this thing is driving me nuts. I recently did away with the smog pump on my wife’s 96 F250 gasser. It has a 351. I eliminated the smog pump and an idler pulley then ran a shorter belt. The set up works great. Except, when the truck starts up it sounds like a screaming banshee who has not had her morning coffee. It is even worse when it is cold out. All the pulleys are in good shape the belt is new what is the issue? I think maybe the belt is a little too short and I should go with a half inch longer. What do you all think?
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post #2 of 10 (permalink) Old 03-31-2010, 09:42 PM
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try a different brand belt

1996 psd 5speed 4x4 cc 8' bed, 3" body lift, 35's swamped, dp-tuner, intercooled, custom fuel system, no fan, and a few other goodies, 263k. 349.2hp sold
2003 7.3 4r100 4wd sc 8', xlt 20th anniversary edition
stock cept for duals. 260k sarted out as a 2wd xl work tk
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99 v-10 4x4 sc sb auto 275hp gas guzzler
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post #3 of 10 (permalink) Old 03-31-2010, 09:55 PM Thread Starter
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Really? You think it could be that brand? I had not thought about that, but I see your point.
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post #4 of 10 (permalink) Old 04-01-2010, 12:03 AM
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A couple of other things to check.

1)Do you have an automatic tensioner (if yes is it in the range of 1/2 to 2/3 deflection)?

2)Are you getting enough "wrap" around your water pump, power steering pump, altenator, etc? as you said you eliminated an idler and a pump, you may have to put one back in, in order to drive a load that doesn't have enough belt wrap. (I believe the minimum is 120 degree's of wrap for loads but the more the better)

3)Are all your idlers and pullys aligned? A crooked pulley (even slightly) can cause the backing on a serpintine belt to glaze over, get hard and squeal in no time.

Lets us know how you make out.

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post #5 of 10 (permalink) Old 04-01-2010, 12:05 AM Thread Starter
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thanks. You brought up some stuff I did not think of. I will check those things tomorrow.
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post #6 of 10 (permalink) Old 04-02-2010, 12:50 AM
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had a napa on my 99 when I got it, squelling badly, cleaned, checked all pulleys etc, all ok.
put a motorcraft belt on , no squeal.
went 500 miles started to get a chirp, thought is was alt, changed alt, noise went away for a day, then thought it was ps pump swapped that and noise got real bad, took MC belt off put napa back on, no noise, went 25 miles and napa squealing worse than ever.
put a new MC belt on and its been 200 miles noise free.

1996 psd 5speed 4x4 cc 8' bed, 3" body lift, 35's swamped, dp-tuner, intercooled, custom fuel system, no fan, and a few other goodies, 263k. 349.2hp sold
2003 7.3 4r100 4wd sc 8', xlt 20th anniversary edition
stock cept for duals. 260k sarted out as a 2wd xl work tk
Early 99 CC dually 4x4 4r100 dark lights, dark windows, stainless simulators
99 v-10 4x4 sc sb auto 275hp gas guzzler
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post #7 of 10 (permalink) Old 04-02-2010, 01:04 AM
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To find a component that squeals what I do is take a soap bottle with a stream setting and spray the pulley, If it stops you have found it and also it will clean the belt. A preasure washer, with soap works to clean the belt. It takes a very little contamination to get the belt to squeal. Also as was said if in removing the component, you changed the belt wrap, around a pulley, then you will have a problem. I dought that putting on a longer belt will cure the problem, unless the belt is overtightened to the extreme.

1988 ford van fresh overhaul, 1991 nissan pick-up 1993 Caprice 2000 GMC S10 Blaser 2007 nbs 3500 GMC 4x4 crew-cab long box 17 inch single wheels Duramax Alison. BW turnover Ball. Furakawa FL35 loader. Retired, HD mechanic, worked on engines all my life. Fabricator welder. electrician. in the process of finishing my new shop. Live in Rock Creek B.C. Wife has a fruit stand.
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post #8 of 10 (permalink) Old 04-02-2010, 02:17 AM Thread Starter
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Who sells Mc's?

I thought about using the soap method. But it only sqeels on start up. I do not have enough time to check them.
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post #9 of 10 (permalink) Old 04-02-2010, 03:00 AM
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I would take it to a car wash and wash off the motor, and threw the rad with the motor running.

1988 ford van fresh overhaul, 1991 nissan pick-up 1993 Caprice 2000 GMC S10 Blaser 2007 nbs 3500 GMC 4x4 crew-cab long box 17 inch single wheels Duramax Alison. BW turnover Ball. Furakawa FL35 loader. Retired, HD mechanic, worked on engines all my life. Fabricator welder. electrician. in the process of finishing my new shop. Live in Rock Creek B.C. Wife has a fruit stand.
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post #10 of 10 (permalink) Old 04-02-2010, 03:02 AM Thread Starter
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I think I need to do that any way.
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