Corvair DiagramCorvair Photo
Corvair Center
home forum corvairs calendar links Corvair Podcast
California Corvairs
Clarks Corvair
Clarks Corvair
“CORSA"



Chevy Corvair License Plate
Chevy Corvair Chrome Wheel
Corvair Center Forum :  Corvair Center Phorum The fastest message board... ever.
Corvair Center 
Pages: 123Next
Current Page: 1 of 3
Blower bearing noise?
Posted by: Cheese ()
Date: May 05, 2016 06:20PM

Hi all. I was hoping that I could get some help on what my problem is. It starts up and idles fine on the fast idle. Everything sounds good. When it warms and hits idle at around 500 RPM I'm getting a pretty bad rattling sound. I removed the belt and it goes away so it is either the the generator, fan or idler pulley. It sounds like its coming from the fan area to me but it doesn't sound like the usual bearing howling sound associated with a bad bearing. It sound more like something is loose or off balanced.

I recorded a video. Could you take a look and let me know what you all think?

Link to video

Thanks,

Matt
63 Vert
Dyer, IN
............................................

Options: ReplyQuote
Re: Blower bearing noise?
Posted by: zachness ()
Date: May 05, 2016 06:52PM

hard to tell from the video. try taking off the belt and checking all the bearings by spinning them by hand,the generator, the fan, and the idler, too. might as well check your crankshaft pulley, too - if it's one of the older riveted ones, the rivets can loosen up.

Detroit, Michigan
former Corvairs:
1964 500 2dr (my first car, i bought it for $1!!!)
1965 Corsa turbo vert
presently:
65 Monza 4 door 110/PG
2006 Ford Freestar

Options: ReplyQuote
Re: Blower bearing noise?
Posted by: davemotohead ()
Date: May 05, 2016 06:59PM

Sounds like the fan is hitting the top cover,check the clearance there, sometimes on the small bearing top covers the bearing can walk out of its mount and the fan can hit the shroud.







1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

-----------------------------------
Rust Free Lancaster Ca

Options: ReplyQuote
Re: Blower bearing noise?
Posted by: 63vert ()
Date: May 05, 2016 07:00PM

I've had a fan bearing "walk" before. It caused the fan itself to crack at its' mount and also have the edges of it strike odd parts of the turkey roaster, making a sound similar to what I heard in your video.

Rockingham, NC

1962 Greenbrier
65 110 4speed

Options: ReplyQuote
Re: Blower bearing noise?
Posted by: Cheese ()
Date: May 05, 2016 07:02PM

Thanks Zach,

The harmonic balancer is brand new. The generator I took off another engine i had and it was not making the noise on that engine. That leaves me with the Fan and the idler. I spun those by hand and cant really tell which one could be causing it.

Matt
63 Vert
Dyer, IN
............................................

Options: ReplyQuote
Re: Blower bearing noise?
Posted by: 63vert ()
Date: May 05, 2016 07:02PM

Ha! Dave, you finished your thought as I was writing mine!smileys with beer

Options: ReplyQuote
Re: Blower bearing noise?
Posted by: Cheese ()
Date: May 05, 2016 07:03PM

Ok, I will check the clearance on the top cover. I didnt think of that since it doesnt make the noise at high RPM

Matt
63 Vert
Dyer, IN
............................................

Options: ReplyQuote
Re: Blower bearing noise?
Posted by: 63vert ()
Date: May 05, 2016 07:08PM

Cheese Wrote:
-------------------------------------------------------
> Ok, I will check the clearance on the top cover.
> I didnt think of that since it doesnt make the
> noise at high RPM


Yeah, rpm's can have an effect on it if the bearing walked "just enough" to make fan contact at high or low rpms.



Edited 1 time(s). Last edit at 05/05/2016 07:09PM by 63vert.

Options: ReplyQuote
Re: Blower bearing noise?
Posted by: davemotohead ()
Date: May 05, 2016 07:12PM

I have seen guys Get home by putting a chunk of wood or using a soft blow rubber hammer and taping it back down when it starts making noise,, the fix is drilling and taping a set screw in the top cover before the bearing gets loose.







1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

-----------------------------------
Rust Free Lancaster Ca

Options: ReplyQuote
Re: Blower bearing noise?
Posted by: Cheese ()
Date: May 05, 2016 07:13PM

If it is the bearing has walked, I assume this cant be fixed on the engine?

Matt
63 Vert
Dyer, IN
............................................

Options: ReplyQuote
Re: Blower bearing noise?
Posted by: cnicol ()
Date: May 05, 2016 07:15PM

You can tap it down a little but the fix won't last very long. I had a friend who would tap his Rampside's fan down roughly once a day! He finally got a new top cover and the later, larger shaft bearing.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

Options: ReplyQuote
Re: Blower bearing noise?
Posted by: MattNall ()
Date: May 05, 2016 07:17PM

All you can do is tap it down and hope it stays..... otherwise it has to come apart

MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
...............110-PG.................................................Webered-Turbo

Options: ReplyQuote
Re: Blower bearing noise?
Posted by: steve c goodman ()
Date: May 05, 2016 07:22PM

Check your generator for tightness on the outer end.

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo---1965 Crown V8
1967 monza 110/4---1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC/V8 Registry

Options: ReplyQuote
Re: Blower bearing noise?
Posted by: Cheese ()
Date: May 05, 2016 07:27PM

Steve, I'm not sure what you mean by that. Can you explain a little more?

Matt
63 Vert
Dyer, IN
............................................

Options: ReplyQuote
Re: Blower bearing noise?
Posted by: steve c goodman ()
Date: May 05, 2016 08:32PM

The outer end frame is attached with a single bolt to a bracket attached to the head. All you have to do is grab ahold of the generator and see if it moves easily. The end where the brushes are located.

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo---1965 Crown V8
1967 monza 110/4---1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC/V8 Registry

Options: ReplyQuote
Re: Blower bearing noise?
Posted by: Cheese ()
Date: May 05, 2016 08:35PM

Ok, Thanks Steve. Just checked it. It's tight.

Matt
63 Vert
Dyer, IN
............................................

Options: ReplyQuote
Re: Blower bearing noise?
Posted by: ral1963 ()
Date: May 08, 2016 10:35AM

Seems like the next logical test is to tap the blower bearing with a wood mallet or deadblow hammer and if seating the bearing removes the noise...

Rick Loving
Corvair historian & chronicler of useless facts
CORSA
Performance Corvair Group
Chicagoland Corvair Enthusiasts

RAL1963@COMCAST.NET
Just south of Chicago IL

Current Ride
63 Sprint Vert 140/4sp

Past Rides
60 700 Sedan 80hp PG
63 Monza Vert 102hp 4 spd
63 Monza Coupe 140hp 4 spd
63 700 Sedan 80hp 3 spd
64 Monza Vert 110hp 4 spd
64 Monza Coupe 95hp 3 spd
64 Monza Sedan 110hp PG
65 500 Coupe 95hp 4 spd
65 Monza Coupe 110hp PG
65 Corsa Coupe 140hp 4 spd
66 Turbo Coupe 180/4sp
68 Monza Vert 140hp 3 spd

Options: ReplyQuote
Re: Blower bearing noise?
Posted by: Cheese ()
Date: May 08, 2016 12:10PM

Thanks Rick. I tried that but the noise stayed. I took the top cover off last night. I didn't see any signs on the fan or the underside of the shroud indicating that the fan was hitting it. Now that I have everything apart I'm going to replace the bearing. I measured the current bearing's height and it is an inch and a half from the top cover so that seems ok according to one of dave's videos.

I do have a question about the fans and the top cover vent. Are the fans balanced from the factory? My fan was sand blasted and painted. Could that have thrown off balanced? Also, on my top cover and vent, I have a spare from a 64 110 that has the vent cover trimmed to fit inside the top cover. Is that a modification someone made or was that a factory change?

Matt
63 Vert
Dyer, IN
............................................

Options: ReplyQuote
Re: Blower bearing noise?
Posted by: davemotohead ()
Date: May 08, 2016 01:04PM

That trimmed vent plate inside the top cover was a modification done by someone and a bad one at that! sometimes it will suck that trimmed cover into the crank and then your done! Don't use it! Hope your car does not have one like that now? the noise is so loud it should be easy to pin point, I would not start replacing parts until you figure out what the noise is coming from, figure it out first, then fix it.







1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

-----------------------------------
Rust Free Lancaster Ca

Options: ReplyQuote
Re: Blower bearing noise?
Posted by: Cheese ()
Date: May 23, 2016 03:27PM

Ok, here is an update on the issue. Changed out the blower bearing. Did not fix it. Swapped out the idler pulley. Did not fix it. Swapped out the generator. Did not fix it. The Harmonic balancer is new. Still have the noise. To me is still seems to be coming from the fan area. I did not see any evidence of the fan hitting the top shroud. Any more ideas what I can check? Once again, the noise is not there if I remove the belt. Can it be the fan is out of balance? Seems like the belt flops around at low rpm or is that normal?

Here is a link to the new video that is a little longer.

Engine noise video

On a side note, is the about of smoke coming out of the crankcase vent normal?

Matt
63 Vert
Dyer, IN
............................................

Options: ReplyQuote
Pages: 123Next
Current Page: 1 of 3


Sorry, only registered users may post in this forum.
This forum powered by Phorum.