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Old 01-02-2021, 05:59 PM   #1
hombres ruin
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Default Whirring noise .. from I donít know where

Hi. My 41 coupe is making a whirring noise and I need help to pin it down. So 6V new generator (replaced the older one about 3 months ago) water pumps are sealed bearing units from van pelt. A new belt went on when the pumps went in about a year or so ago. The belt is at the correct tightness per the 41 handbook . 1 inch deflection midway between generator and water pump pulley. So on start up it idles perfect no noise . When she warms up and I have driven the car for some time . When i idle the car in park and give it some gas to a higher RPM she makes the noise . Most times it lasts about 10 seconds and itís gone and back to a noiseless idle. Other times itís sustained until I turn the engine off and start her up again and itís gone. I put belt dressing on the fan belt and the noise still occurs. It will make a whirring sound then it sounds like the belt gains traction and it stops and idles with no noise . Any ideas ? Time for a new belt?
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Old 01-02-2021, 07:28 PM   #2
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Default Re: Whirring noise .. from I donít know where

Start off with a sanity check. Does it make the same noise when the belt is removed? At least that would prove the noise is belt related (or not). Mart.
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Old 01-02-2021, 08:31 PM   #3
hombres ruin
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Default Re: Whirring noise .. from I donít know where

I will run it tomorrow then take the belt off and see what it does . I have a video of it but I can’t upload for some reason
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Old 01-02-2021, 08:40 PM   #4
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Default Re: Whirring noise .. from I donít know where

Long shot. Be sure you have enough free play in your clutch, and that the return spring on the throw out bearing is working. The test is to put your foot on the clutch when the noise is happening. If the throw out bearing is singing, that will change the noise; probably make it go away.
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Old 01-02-2021, 10:27 PM   #5
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Default Re: Whirring noise .. from I donít know where

I struggled w/that annoying problem for a few yrs . I would spray some belt dressing spray on the belt & it would temporarily go away . Tried different belt tensions . Finally I bought a new belt from NAPA . Problem gone . Just wish I had tried that sooner ! - F F
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Old 01-02-2021, 11:43 PM   #6
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Default Re: Whirring noise .. from I donít know where

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i get the same noise at times have found that holding some hard bar soap on the sides of the belt while running cures the noise until the next bout of wet weather
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Old 01-03-2021, 06:02 AM   #7
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Default Re: Whirring noise .. from I donít know where

When it's making the noise, hold a broom handle up against your ear and then press end of the handle up against the generator or whatever else. It will act like a doctors stethoscope and you'll know what's making the noise.
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Old 01-03-2021, 07:24 AM   #8
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Default Re: Whirring noise .. from I donít know where

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When it's making the noise, hold a broom handle up against your ear and then press end of the handle up against the generator or whatever else. It will act like a doctors stethoscope and you'll know what's making the noise.
The ol' broom stick ...can you still find a wooden one?
Just remember what mom said..."Don't put anything smaller than your elbow in your ear." Chap
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Old 01-03-2021, 08:46 AM   #9
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Default Re: Whirring noise .. from I donít know where

Or get one of these, Iíve had one for years, got mine from a swap meet tool vendor.
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Old 01-03-2021, 11:04 AM   #10
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Default Re: Whirring noise .. from I donít know where

I am in medicine so I grabbed my stethoscope and listened to the generator while the noise was happening and it wasn’t present there. It was normal.
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Old 01-03-2021, 05:25 PM   #11
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Default Re: Whirring noise .. from I donít know where

Long shot,I once had a starter bendix contact the ring gear intermitantly
New bendix fixed it. It made clics and whirrs. Took a while to find it.

John
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Old 01-04-2021, 02:59 PM   #12
Graeme / New Zealand
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Default Re: Whirring noise .. from I donít know where

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Or get one of these, Iíve had one for years, got mine from a swap meet tool vendor.
Holy moly.... imagine the Doc using this on you it would give you a "heart issue" rather than diagnose one.

GB
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Old 01-04-2021, 04:05 PM   #13
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Default Re: Whirring noise .. from I donít know where

Whirring noise?
Next time you hear it, look UP , it might be one of these.
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Old 02-23-2021, 12:40 PM   #14
hombres ruin
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Default Re: Whirring noise .. from I donít know where

So I ran the motor minus the belt, the gen and new water pumps weren’t in play. On higher RPMs the noise was there lasted for 10 seconds then went away. Gassed it again noise came back for seconds then gone. I seemed to have isolated to the bottom fan pulley. It’s not touching anything . The noise sounds like a low whooshing . I have no oil pressure issues no fuel issues no over heating issues . It doesn’t happen at idle only on higher RPMS and even then I won’t do it.. I got a new gen, new Napa belt and it’s still there . Any ideas? Bearing?
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Old 02-23-2021, 03:59 PM   #15
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Default Re: Whirring noise .. from I donít know where

Vacuum leak or exhaust leak
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Old 02-23-2021, 06:40 PM   #16
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Default Re: Whirring noise .. from I donít know where

You have an Aluminum timing gear ?
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Old 02-23-2021, 06:59 PM   #17
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Default Re: Whirring noise .. from I donít know where

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I will run it tomorrow then take the belt off and see what it does . I have a video of it but I can’t upload for some reason
hi hombres ruin, yeah it would be super helpful to see/hear a vid. But FordBarn donesn't allow videos to be posted/uploaded.

You'll have to put it up on another host, then link it here. YouTube allows you to make an account that'll let you send the video there.
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Old 02-24-2021, 11:17 AM   #18
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Default Re: Whirring noise .. from I donít know where

I would check fan blades for cracks, fan hub bolts and my crankshaft pulley bolt for tightness. had a similar noise on my stove bolt six just before the the fan blade came threw the hood. good luck, Tim
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Old 02-24-2021, 11:22 AM   #19
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Default Re: Whirring noise .. from I donít know where

I assume you have the same lower pulley and fan as mi 41 pickup.
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Old 02-24-2021, 11:45 AM   #20
hombres ruin
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Default Re: Whirring noise .. from I donít know where

Thanks .. I will check for a vacuum leak tomorrow..
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