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Re: Blower Bearing
Date: January 05, 2011 02:56PM

My car is a PG, and I don't envision pushing it. I suspect steel is OK for my application.

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
Date: January 05, 2011 09:45PM

Hey Texas Dude - So that's where my gauge came from! I use it all the time for rebuilding bearing assemblies. It's a handy item.

On another subject the 64 and later magnesium fan impact shouldn't be minimized - it ended up being the primary way the factory solved belt throwing problems on regularly driven cars. On the other hand, if you have an automatic then you'll probably do ok with an old steel one -

Lon Wall
www.corvairunderground.com
800-825-8247
Watch for the all new website Homepage

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Re: Blower Bearing
Posted by: 66vairman ()
Date: January 06, 2011 10:41AM

Some great advice here.

Last week I had a Vair friend call to say he destroyed a cover trying to press in a bearing. He asked why it happened. I told him about heating with a torch and he was amazed.

Getting the height correct is also important.

"It's always easier when you know what your doing". That's what makes this forum so important to the Corvair hobby.

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Re: Blower Bearing
Posted by: Gregory_Miller ()
Date: January 06, 2011 10:43AM

I have learned so much in the last year or so I've been on this forum, and made many "virtual" friends that I'm sure I would have a grand time talking with in person. I'm thankful this resource is available.

Greg Miller
Eugene, Oregon

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Re: Blower Bearing
Date: January 06, 2011 07:00PM

I couldn't agree more!

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: The Stig ()
Date: January 10, 2021 11:59AM

Huh ha! Thanks Chris for posting the pictures of this ten years ago!
I have one of the OTTO tools and never really got around to using it.

Works like a champ!


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Re: Blower Bearing
Posted by: Timothy Shortle ()
Date: January 10, 2021 05:37PM

A good old Corvair friend of mine fixed my top cover after the blower fan raised up while driving to/from the Ventura Convention (2008?) by installing a pointed jam screw with some red loctite. So just because the top cover was destroyed by an incorrect bearing installation does not mean this cover is not still serviceable.

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Re: Blower Bearing
Posted by: JimBrandberg ()
Date: January 11, 2021 05:00AM

I don't see anything about a $12 bearing to fit EM in the link above.
I think Clarks is running about $35 for EM and $45 for LM.
Is the consensus that the steel fan moves more air than the magnesium?

Jim Brandberg
Isanti, MN
CorvairRepair.com



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Re: Blower Bearing
Posted by: 63turbo ()
Date: January 11, 2021 07:19AM

JimBrandberg Wrote:
-------------------------------------------------------

> Is the consensus that the steel fan moves more air than the magnesium?

The 61-63 fan has 2% more output than the mag fan does...

Both those fans have quite a bit more output than the 1960 fan.

In actual practice though, it is dirt simple to get large changes in output with
the mag fan, that greatly exceed this 2% difference. The as installed fan to shroud gap for the mag fan is way too much, the air "spins" as it goes into the intake resulting in another large loss ("probably" 9%!!!), and the actual intake
area when the pulley area is taken into account is far too small. Deal with that stuff, and theres zero reason to bother with the 61-63 fan!!

Of course, the prodigous output of the Nashfan makes the mag fan look pretty darned "small", without wasting so much power!!

------------------------------------

Kevin Nash
Friday Harbor Washington
63 Spyder, Daily driver, EFI read about my project here: [corvaircenter.com]
first test start on EFI here:[www.youtube.com]
first official EFI boost test here:[www.youtube.com]
My new fan! [corvaircenter.com]
engine less 62 Spyder
Canadian 64 Monza Parts car






Edited 1 time(s). Last edit at 01/11/2021 07:27AM by 63turbo.

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Re: Blower Bearing
Posted by: Wagon Master ()
Date: January 11, 2021 07:57AM

63turbo Wrote:

The as installed fan to shroud gap for the mag fan is way too much.

So what new measurement do you recommend on the bearing install? Or is it just trial and error to fit the fan as close as possible without hitting?

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Re: Blower Bearing
Posted by: 63turbo ()
Date: January 11, 2021 08:58AM

Wagon Master Wrote:
-------------------------------------------------------
> 63turbo Wrote:
>
> The as installed fan to shroud gap for the mag fan is way too much.
>
> So what new measurement do you recommend on the bearing install? Or is it just trial and error to fit the fan as close as possible without hitting?


Unfortunately, it is not that simple. The fan bearing height influences both the fan to shroud clearance as well as the vertical pulley alignment. The shop manual spec is the correct height for best fan belt alignment, but for the tightest "safe" fan to shroud clearance, the fan would be a good 1/8 of an inch closer to the shroud!!! The way to deal with that issue correctly is to raise the fan height and lower the height of the pulley by exactly the same amount.

A stone stock bearing height with a mag fan is going to result in a fan to shroud clearance of .2" to 3/16", and a good goal is to set that clearance at less than .1", although people have gone as tight as 1/16" with gratifying results!

The "infamous" Airflow pulley makes this ideal shroud gap business much easier to achieve without messing with the pulley alignment!

------------------------------------

Kevin Nash
Friday Harbor Washington
63 Spyder, Daily driver, EFI read about my project here: [corvaircenter.com]
first test start on EFI here:[www.youtube.com]
first official EFI boost test here:[www.youtube.com]
My new fan! [corvaircenter.com]
engine less 62 Spyder
Canadian 64 Monza Parts car



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Removing fan, Re: Blower Bearing
Posted by: Saxon ()
Date: January 11, 2021 11:01AM

How do I remove the magnesium fan from the bearing assembly?

I have WD40 sprayed & rapped the outer cylinder with a rubber mallet, but no indications of separation or loosening observed.

I have let some liquid wrench settle into where I believe the separation joints are.

Next step is to heat gun the base of the magnesium fan to get it to expand away from the cylinder.

Thanks!

P.S. I don't know how to post an image without using a URL.

1966 140



Edited 1 time(s). Last edit at 01/11/2021 11:05AM by Saxon.

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Re: Removing fan, Re: Blower Bearing
Posted by: toms73novass ()
Date: January 11, 2021 11:12AM

Heat would be a good idea, my guess is the magnesium corrosion has bonded to the steel. It is just a very close slip fit after the bolts are out.

-Tom


63' Monza Spyder Convertable (in process) MY Build Thread
65' Monza MY Build Thread
73' NovaSS 454 Big block (Sold)
86' BMW 325es
98' VW Jetta TDI, for daughter
01' Audi Allroad Stage 3 twin turbo
67' UltraVan 211 "Violet"
NFCC, UMCC
Grand Island, NY

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Re: Blower Bearing
Posted by: joelsplace ()
Date: January 11, 2021 11:17AM

Was the fan changed mid year in '61? Most of the '61s I've seen have the '60 style fan or at least one that only has blades around the outside and not all the way to the center like the '62-'63.

Joel
Northlake, TX
5 Ultravans, 114 Corvairs and counting...

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Re: Blower Bearing
Posted by: Timothy Shortle ()
Date: January 11, 2021 11:48AM

To remove grab the fan 180 degrees apart and rock it up on the left side then on the right, etc.

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Re: Blower Bearing
Posted by: JimBrandberg ()
Date: January 12, 2021 05:51AM

I turn my small ball peen sideways and rap under it turning 1/3 or so with each rap.

Jim Brandberg
Isanti, MN
CorvairRepair.com



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Re: Blower Bearing
Posted by: irfgt ()
Date: January 12, 2021 06:25AM

When I worked for Chevy we used to leave the cover on the engine and used a slide hammer and a torch to remove the bearings and a hammer and torch to reinstall. Used a tape measure to check installed height.

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Re: Blower Bearing
Posted by: gmgmtl ()
Date: January 12, 2021 07:59AM

I like davemotohead's use of bolts to set height.
[www.youtube.com]

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Re: Blower Bearing
Posted by: Layton Curtis ()
Date: January 12, 2021 08:20AM

The right height is not rocket science. I heat the cover and when the bearing housing is ready to drop I put a .156 wire or drill bit between the bearing housing and the cover and hold it there until it cools.

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Re: Blower Bearing
Posted by: 66vairman ()
Date: January 12, 2021 08:27AM

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.

Craig N gave a good summary. However TY's tool is a must. I made one similar and it allows the bearing and flange to drop in fast and at the correct height (spec. is in shop manual) using a simple propane torch and minimal heat. If you keep re-heating the cover to "ADJUST" the bearing/flange height you'll cook the grease out of the overheated bearing - not good.

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