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Blower Bearing
Date: January 04, 2011 05:16PM

There has been a lot of discussion in the forum regarding the blower bearing and the wisdom of replacing it. Mine seems to be in excellent condition. It spins silently and has no play. When I spin it by hand it continues spinning under its own momentum for a full thirty seconds. Is there any need to replace it?

Corey Pedersen
Amston, CT
1962 Monza 102 HP Convertible - Restoration Complete
1964 VW Beetle - Restoration Complete
1981 Chevy C-20 - Better Than New!
1951 MG-TD - Newest Addition
Member of Bay State Corvairs and CORSA

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Re: Blower Bearing
Posted by: bought1 ()
Date: January 04, 2011 05:26PM

Corey,

It sounds counterintuitive, but if the bearing spins freely like that for 30 seconds, its given up the ghost. A fully greased bearing should only spin a couple of times and then stop. I'd replace if it was mine.

Dave



Edited 1 time(s). Last edit at 01/04/2011 05:26PM by bought1.

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Re: Blower Bearing
Posted by: SpyderMan ()
Date: January 04, 2011 05:32PM

Dave, beat me to it. Good advice.

Sam Russell
Durham NC
1962 Monza Wagon Ted Brown EFI Gen II
1964 Spyder coupe


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Re: Blower Bearing
Posted by: cnicol ()
Date: January 04, 2011 05:33PM

Definitely must be at least serviced or preferably replaced. When they spin that long, it means that the grease is gone. A new bearing won't spin 1/2 turn due to the drag of the grease.

The last EM bearing cartridges I purchased were about $12 each.
click here

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




Edited 1 time(s). Last edit at 01/04/2011 05:38PM by cnicol.

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Re: Blower Bearing
Posted by: flamingchariots ()
Date: January 04, 2011 05:39PM

It does sound counterintuitive. I'm glad you posted this.
One more thing I learned.

Kevin
Medina, OH

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Re: Blower Bearing
Posted by: mwr ()
Date: January 04, 2011 05:39PM

Is the fan bearing a standard industrial size, for example would there be any point in getting some fancy ABEC-5 or 7 bearing for it from McMaster Carr or something?

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Re: Blower Bearing
Posted by: cnicol ()
Date: January 04, 2011 05:48PM

It's a standard water pump bearing plus it has some industrial uses. Back in the day when mechanics rebuilt water pumps, this was a common FLAPS item. The idler uses the same bearing but with a shorter shaft but that's a pretty uncommon item.

I have not been able to locate a replacement for the larger LM bearing. Anyone have any luck there?

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

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Re: Blower Bearing
Date: January 04, 2011 05:52PM

Wow, that was unexpected! OK, a new bearing it is. Clarks sells both bare bearings and bearings assembled to the housing. No doubt this has been visited before, but can you tell me how difficult it is to remove/install the bearing?

In the same vein, my idler pulley spins nicely as well. I assume the same advice applies?

Thx.

Corey Pedersen
Amston, CT
1962 Monza 102 HP Convertible - Restoration Complete
1964 VW Beetle - Restoration Complete
1981 Chevy C-20 - Better Than New!
1951 MG-TD - Newest Addition
Member of Bay State Corvairs and CORSA

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Re: Blower Bearing
Posted by: bought1 ()
Date: January 04, 2011 06:02PM

Here's how I did mine:

I removed/installed the blower bearing on my 64 with a propane torch and an improvised U-shaped wooden shim. I made the shim to fit snugly between the old bearing and the top cover before I removed the old bearing. Then I heated the old bearing/top cover area with a propane torch for about 2 minutes. Turned the cover upside down and the bearing fell out. Then I reheated the top cover again and slid the shim on the shaft of the new bearing and slid the bearing in. I put the new bearing in my freezer the night before. I believe this process is outlined in the Tech Guide. Took me all of 10 minutes to do and it works perfectly now.

PS Wear heavy gloves!


And, yup, idler pulley bearing sounds bad as well.

Dave

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Re: Blower Bearing
Posted by: cnicol ()
Date: January 04, 2011 06:10PM

If you have a press and a selection of larger diameter tubing, it's a pretty easy job to install the hub to a new bearing.

Installing the bearing to the top cover is a little more complicated - the cover must be heated in an oven or with a broad-flame torch. When the cover is up to temp (350+) the bearing can be tapped out and the new one installed easily.

The tricky part is setting the bearing height. (4.5" give or take a few thousanths).
Sit the top cover on a FLAT surface. Place a straightedge over the top of the fan mounting surface. Measure and adjust the gap between the straightedge and the flat surface. This all has to be done while the cover is HOT so the bearing/hub height can be adjusted.

If you try to install the bearing into a cold cover, it will broach/stretch the bore and the bearing will no longer stay put. My friend Lance had one of those and he would periodically have to get out, run around to the back and hammer the bearing back in!

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

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Re: Blower Bearing
Date: January 04, 2011 08:11PM

Thx guys. I'm not familiar with the Tech Guide. I see that it's fairly pricey. Is it worth the cost?

Corey Pedersen
Amston, CT
1962 Monza 102 HP Convertible - Restoration Complete
1964 VW Beetle - Restoration Complete
1981 Chevy C-20 - Better Than New!
1951 MG-TD - Newest Addition
Member of Bay State Corvairs and CORSA

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Re: Blower Bearing
Posted by: ihscomputers ()
Date: January 04, 2011 08:26PM

You might consider buying a cover with a new bearing already pressed in

I successfully destroyed a cover using a hydraulic press on the bearing assembly. Yes, I was heating the cover but got impatient...sad smiley

Dean F. Gemberling
Columbus, Georgia
Heart of Georgia Corvair Club Webmaster
Springfest Webmaster

1963 Rampside w/305 V8 - Built by Ken Arnold in 1998

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Re: Blower Bearing
Posted by: texas yenko dude ()
Date: January 04, 2011 08:37PM

Back when dad had OTTO Parts, he made a fixture to set the height very easy. Here is a picture of the fixture and then a picture of the fixture in position. Have the fixture in position, have the tab screwed to the new bearing, heat the top cover and drop it in. As easy as it comes.

Texas YENKO Dude
YS-070
YS-199
YS-320
Southeast of Disorder


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Re: Blower Bearing
Posted by: Pacerace ()
Date: January 04, 2011 11:05PM

texas yenko dude Wrote:
-------------------------------------------------------
> Back when dad had OTTO Parts, he made a fixture to
> set the height very easy. Here is a picture of
> the fixture and then a picture of the fixture in
> position. Have the fixture in position, have the
> tab screwed to the new bearing, heat the top cover
> and drop it in. As easy as it comes.


Simple, fast, and effective. I like it!

________________________________________________________

Chandler
Powder Springs, GA.



1965 Corvair Monza 110/4sp Coupe

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Re: Blower Bearing
Date: January 05, 2011 06:09AM

That is one wide range of options! Thx to all for the input.

Corey Pedersen
Amston, CT
1962 Monza 102 HP Convertible - Restoration Complete
1964 VW Beetle - Restoration Complete
1981 Chevy C-20 - Better Than New!
1951 MG-TD - Newest Addition
Member of Bay State Corvairs and CORSA

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Re: Blower Bearing
Posted by: Gregory_Miller ()
Date: January 05, 2011 10:32AM

Pretty slick, TYD.

Greg Miller
Eugene, Oregon

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Re: Blower Bearing
Posted by: texas yenko dude ()
Date: January 05, 2011 11:17AM

If I get bored ( not likely anytime soon) I may make a batch.

Texas YENKO Dude
YS-070
YS-199
YS-320
Southeast of Disorder


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Re: Blower Bearing
Posted by: Spectre ()
Date: January 05, 2011 12:13PM

I would think that the bearing might spin more than a few rounds if the heavy steel fan like Corey has pictured was still installed. Wouldn't the "spin test" be for the bearing without the fan?

David Clamp


1965 Corsa convertible - 140 4spd/3.55/AM-FM

2013 Mustang GT convertible - 5.0, 6spd auto, Procharger i-1

2003 Miata SE - 6spd manual (wife's toy)

"Victory is mine!" - SG

Norman, OK

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Re: Blower Bearing
Date: January 05, 2011 02:38PM

While we're on the topic, I understand that an aluminum version of the fan is available. Is that a desireable upgrade?

Corey Pedersen
Amston, CT
1962 Monza 102 HP Convertible - Restoration Complete
1964 VW Beetle - Restoration Complete
1981 Chevy C-20 - Better Than New!
1951 MG-TD - Newest Addition
Member of Bay State Corvairs and CORSA

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Re: Blower Bearing
Posted by: Chris Lampe ()
Date: January 05, 2011 02:52PM

Corey,

It's not aluminum, but magnesium, and yes it is desireable, especially if you have a manual trans and enjoy pushing it hard at times. The magnesium fan is much lighter and deals better with rapid changes in RPM better than the heavier steel fan, puts alot less stress on the fan belt and reduces (does not eliminate) the chance of throwing a belt.

Chris
Rowlett, Tx
NTCA - North Texas Corvair Association
CORSA
'64 Monza 'vert

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