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Fan bearing noise?
Posted by: Ron in Indy ()
Date: August 12, 2012 07:05PM

I'm hearing an intermittent squeak/rattle noise that sounds like it may be coming from the fan pulley area. I've never heard a bad or failing fan bearing before, so perhaps a more experienced ear can give me a diagnoses? I haven't tried to run the engine without the belt yet, but it seems like it is adjusted properly.
Cheers,
Ron in Indy

Video here

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Re: Fan bearing noise?
Posted by: jimmyo ()
Date: August 12, 2012 07:28PM

I would remove the belt and spin the pulley, I was able to tell that mine was bad that way. I can't tell from your video but it's also possible the fan is rubbing. You can run it for a SHORT time, and if your still not sure.

Jim O'Connor
45 miles north of The Bronx, N.Y.
1962 Greenbrier 110 4spd
1964 Monza Convertible 110 PG
"Wherever you go....There you are"


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Re: Fan bearing noise?
Posted by: Ron in Indy ()
Date: August 13, 2012 12:21AM

Thanks,
Yeah, it's hard to hear on the video, but it sounds like a chirp or squeak, but it isn't constant. Doesn't seem to be worse or better that it was when I noticed it a while back. It's only noticeable at idle, but probably the engine noise masks it at higher rpms. I replaced the belt (I originally thought it was slipping) but the new
one still makes the same noise. I'll try spinning the fan without the belt.
Cheers,
Ron in Indy

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Re: Fan bearing noise?
Posted by: Darrin ()
Date: August 13, 2012 12:24AM

Try spinning the alternator as well...and the idler.

Darrin Hartzler
Bethesda, MD
1963 Spyder convertible (trading for a 66 vert)
1965 turbo Corsa project
1965 EFI Monza coupe
1965 10K original mile Monza
1965 Greenbrier deluxe 8 door
1965 Canadian turbo Corsa
1967 moredoor airvair

Northern Virginia Corvairs & Group Corvair

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Re: Fan bearing noise?
Posted by: Layton Curtis ()
Date: August 13, 2012 01:18AM

CHirping can comefrom bent alt fan or bad bearings. check yours

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Re: Fan bearing noise?
Posted by: fortydosdegrees ()
Date: August 13, 2012 03:15AM

That was the first thing that went wrong when i got my corvair. Sounds just like my fan bearing. A week after that noise it disinegrated. Think about getting a new one. There are cheap and a great way to jump into the car.

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Re: Fan bearing noise?
Posted by: MattNall ()
Date: August 13, 2012 03:32AM

Here's what a bad fanbearing sounds like.. 1st and last of file





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Somewhere between Sea Mountain and Coos Bay! SW Oregon Coast
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.............................PG...................................Turbo

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Re: Fan bearing noise?
Posted by: davemotohead ()
Date: August 13, 2012 03:48AM

If you listen to Matts Sound bite you can realy hear the "Howl" of the bad fan bearing at the end,,Most times you will start to hear a Howling noise at idle when its cold when the bearing first starts going bad,,and after a while it will make noise all the time.



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Re: Fan bearing noise?
Posted by: vairchet ()
Date: August 13, 2012 04:58AM

First detection of a noisy fan bearing as well as idler, they'll start howling when cold. Then go quiet when warmed up. At this point, either bearing can be regreased and probably last for a long time. But, if bearings are beyond howling and now rumbling, no amount of grease will repair a damaged bearing. It will be necessary to replace bearing once it begins to rumble and rattle.

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Re: Fan bearing noise?
Posted by: ccvair ()
Date: August 13, 2012 05:50AM

The last one I had that would chirp like a cricket was my 66 with a 110. The balancer outer ring was slipping thus the chirp.Also check the belt had a belt worn down enough were it was actually too skinny to stay in adjustment kept stretching and would only chirp when cool. Odd things these little cars arecool smiley

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Re: Fan bearing noise?
Posted by: Ron in Indy ()
Date: August 14, 2012 01:25AM

Matt,
Thanks for the sound file. I definitely don't hear the howl-just the chirp. I undid the belt and spun the fan. No squeaks or unusual noise (same for generator and idler pulleys) I'm beginning to think it is a "rubber on metal" noise. The belt is new (the notched type from Clark's) Perhaps what ccvair found (slipping balancer outer ring) Any other adjustments worth trying? Belt dressing?
Cheers,
Ron in Indy

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Re: Fan bearing noise?
Posted by: MattNall ()
Date: August 14, 2012 01:37AM

To eliminate the belt.. start spraying it.





MODERATOR
Somewhere between Sea Mountain and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
.............................PG...................................Turbo

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Re: Fan bearing noise?
Posted by: ccvair ()
Date: August 14, 2012 04:40AM

Or if you suspect a balancer check the timming and see if the timming is off.

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Re: Fan bearing noise?
Posted by: JimBrandberg ()
Date: August 14, 2012 12:35PM

I had one chirping that was a head gasket. Went away as the engine warmed. I thought it was a valve spring not getting oiled at first...
Hope I'm not "Off Topic".
Jim Brandberg

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Re: Fan bearing noise?
Posted by: GWLee ()
Date: August 15, 2012 01:20PM

Mine sounded just like Matt's sound file. It would howl like crazy at idle and up. I had never heard a bad fan bearing before but I knew without a doubt mine was toast.
Also My bearing would not spin like it should when I removed the belt.

If yours is chirping you may have other issues, the one way to tell is disconnect the belt to see if it is the fan. If not put the belt back on and use a stethoscope and listen to different parts of the engine until you find the noise, then you will know for sure what is going on.

Lee Adkins

A Cave Man car
1960 2dr Coupe with pg
Color Tasco Turq.
With white top.

Catlettsburg,
In the Beautiful state of
North/East KY!

Not the best pic, but the only I had from then!

Front profile now!

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Re: Fan bearing noise?
Posted by: curt ()
Date: August 15, 2012 03:11PM

Mat, that sounds like a bad water pump, too.

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