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Rear axle bearing repacking
Date: August 21, 2009 12:55PM

Hello all,

I'm a proud new owner of a 65 Monza, and I'm hearing a whirring noise coming from rear. Not too well versed on Corvairs yet but in my experience sounds like bearing noise. And from what I'm reading its probably a good first step to repack bearings.

How does one go about getting at the bearings in this car?

Thanks for any help.

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Re: Rear axle bearing repacking
Posted by: Tom Z ()
Date: August 21, 2009 01:31PM

..getting the 'bearing assy's ' out isn't that hard,you'll need to take all the brake parts off the backing plate and remove the axle 1/2-shaft..4 nuts under the hub flange,slide the bearing and backing plate out,turn it so the yoke is 'vertical' and tilt the hub flange up to get the yoke thru the hole..you'll need a heavy press and measuring tools to set new bearings up,tho,much easier to swap in one from vendors..

Tom Z,,Rochester NY


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Re: Rear axle bearing repacking
Posted by: danielmorsk ()
Date: August 21, 2009 01:38PM

You can rebuild yourself, but it is a difficult job to get right without the proper tools. Save the frustration and send them out for rebuild.

Contact Steve Goodman at Rear Engine Specialists. He did an incredible job on mine.

Daniel M
65 140/4 coupe
61 Rampside 110/4
Stanwood Wa

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Re: Rear axle bearing repacking
Date: August 21, 2009 02:00PM

Thanks all. Will do.

Martin

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Re: Rear axle bearing repacking
Posted by: beaminscott ()
Date: August 21, 2009 03:36PM

To repack the bearings you can place a zert between the two bearings directly in the axle. There is a technical sheet on where the zert has to go but it makes future greasing much easier and the bearings last longer. Possibly a search would turn up details on the technical sheet here. With that said, if they are making noise you can't inspect them without removing them so the above should really only be done if the bearings are known to be good. Good luck!

Note: this only applies to the LM rear bearings.



Edited 1 time(s). Last edit at 08/21/2009 03:37PM by beaminscott.

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Re: Rear axle bearing repacking
Posted by: vairchet ()
Date: August 21, 2009 06:42PM

Typically, when you hear abnormal sounds emanating from bearings, it's too late. Greasing will only prolong the inevitable.... bearings will soon require replacement.

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Re: Rear axle bearing repacking
Posted by: PGrommes ()
Date: August 21, 2009 06:55PM

Does anyone has the technical sheet that Mr. Scott is talking about? Or does it not have to be a real precise job?

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Re: Rear axle bearing repacking
Posted by: teddbrown ()
Date: August 21, 2009 06:57PM

Not to take anything away from our friends in the corvair repair business. We had a tech session on rear bearning about 3 months ago. It was one of the better ones so far. If you have no tools, it might be better to send it out.

On my website, I have a PDF about LM rear bearing rebuilding by Jerry Rotert. Download the PDF here

Ted Brown
Anderson, SC
68 Convert 110/PG/EFI/DIS
61 Loadside Automatic
61 Rampside 4 speed
130HP/PG/Honda Engine Project
**UPDATED** Corvair Fuel Injection and DIS Page

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Re: Rear axle bearing repacking
Posted by: tkalp ()
Date: August 21, 2009 07:13PM

Seldom do I disagree with BeaminScott. I became disenchanted with the grease zerk modification to LM rear bearing housings when I opened up an assembly that had been modified and found a big glob of grease in the middle and nothing on the bearings. The modification is very dependent on getting exactly the right amount of grease into the hub which, IMHO, is a crapshoot.

Doing the bearings right is not that much more difficult, if you have the "jacking" tools from Clark's, a press and a dial indicator. If you are just regreasing, measure the endplay before you take everything apart, if it is OK then everything should go back together the same. If it is out of spec. and the bearing are good, you can then figure your new shim pack. If you are replacing bearings it most likely involve pressing everything together with the new bearings then measureing pulling it apart and restacking the shim pack. If you are lucky and someone has a turned down spindle or the GM tool you can figure your shim pack and should have to only put it together once.

tkalp
wichita, ks

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Re: Rear axle bearing repacking
Posted by: Vairismo ()
Date: August 21, 2009 07:15PM

Thanks for the PDF teddybrown!

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Re: Rear axle bearing repacking
Posted by: beaminscott ()
Date: August 21, 2009 07:22PM

Here is the sheet that I've used on the past. Please use at your own risk based on the additional comments.

tkalp, thanks for the additional information as I've never had one apart that had this process applied. I appreciate the comments of others as I take tips from a lot of people and have to trust it as Gospel until shown otherwise...but I can be taught :-)



Edited 3 time(s). Last edit at 08/21/2009 07:29PM by beaminscott.

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Re: Rear axle bearing repacking
Posted by: PGrommes ()
Date: August 21, 2009 07:47PM

Thanks for the directions, don't know if i am going to do this, but it is an option I had not thought about before.

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Re: Rear axle bearing repacking
Posted by: aircooled ()
Date: August 21, 2009 09:48PM

beaminscott Wrote:
-------------------------------------------------------
> To repack the bearings you can place a zert
> between the two bearings directly in the axle.

Where is the grease you are replacing magically disappearing to? Pushing new grease into an enclosed space that should have the proper amount of grease in it seems like a bad idea to me. Sure you could push the old grease out of the seals, but I suspect you would have the same result I had when I put too much grease in my front hubs... after a long drive I noticed the front brakes did not work very well. Removing the brake drum showed what amounted to a grease explosion inside the drum!

One thing to consider is that these bearings assemblies seem to last for MANY years. Considering how much most people drive their cars it will likely be the last bearing rebuild the car will ever have.

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Re: LM Rear axle bearing repacking / lubing
Posted by: MattNall ()
Date: August 21, 2009 09:54PM

As I've said before:

When adding the Zerk, you must also drill a hole on the opposite side...

This way no pressure builds..yet all air can escape..

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Re: Rear axle bearing repacking
Posted by: m.norton ()
Date: August 22, 2009 01:12AM

I put in 55 strokes in each bearing in mine (moly grease)after 2 years,seven more strokes,each bearing. finch's Keep your corvair alive. have Corsa 180 for 16 years.new york-(2) atlanta-(3)times.no problems at all been driving it every day or so.

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Re: Rear axle bearing repacking
Posted by: m.norton ()
Date: August 22, 2009 01:22AM

No hole in opposite side,I'm not saying thats good or not.sorry I missed this.

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Re: Rear axle bearing repacking
Posted by: 66vairman ()
Date: August 22, 2009 07:07AM

I just took my rear spindles apart and it's not a job for the inexperienced.
If your getting noise and the spindles turn like there's sand in the bearings they spindles need to be rebuilt (new bearings). Unless you're experienced with pulling them apart and getting the outside bearing off the shaft (special tool) then send them to Steve G. for a rebuild.
I have to agree with TKalp about the zerk on the spindle housing not working. The ONLY proper way to regrease bearings of this type is to remove them and clean out the old dried grease and repack them then resemble. Pumping a load of grease in the spindle housing is just not going to do the job properly (and will probably blow out the seals and create a mess). The Corvette guys tried this and the results were not good.
The good news. Once the bearings are cleaned and repacked (if they are good) they will easily go 50K plus miles or until the grease dries out - 20 plus years.
Considering the lengthy span between servicing the rear spindles do it right and you'll have years of trouble free service.

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Re: Rear axle bearing repacking
Posted by: Mark Pietz ()
Date: August 22, 2009 05:54PM

You'll find that "pump in the grease" technique in old Jeep manuals. IH (for the early Scouts) manuals show the same axle ends, but IH "passed" on that form of maintenance and put a plug in the axle end instead of the zerk fitting.

I don't think it's much of a mystery why.

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Re: Rear axle bearing repacking
Date: August 23, 2009 01:15PM

Thanks all once again. Certainly a wealth of info and it sounds like one for the experts so I'll be sending the housings out for rebuild.

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Re: Rear axle bearing repacking
Posted by: 65 Crown Corsa ()
Date: August 23, 2009 01:39PM

Rebuilt units for exchange is the fastest and cheapest way to go!

Ed
65 Crown/Wills Corsa
WPB Florida

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