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Spun Bearing on Pinion Shaft?
Posted by: whubbell ()
Date: September 08, 2018 04:01AM

I pulled apart the rear axle for the Glenn Corvair - I'm pretty sure the rear bearing is not supposed to do this: Click here for video of spun bearing.sad smiley


Original Video - More videos at TinyPic

Bill Hubbell,
President, Stock Corvair Group



Edited 3 time(s). Last edit at 09/08/2018 06:47AM by MattNall.

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Re: Spun Bearing on Pinion Shaft?
Posted by: toms73novass ()
Date: September 08, 2018 05:55AM

Your link does not lead to your video....

-Tom


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Re: Spun Bearing on Pinion Shaft?
Posted by: whubbell ()
Date: September 08, 2018 05:59AM

Hmm. The link works for me. I followed Matt’s instructions. You do need Flash to view it however.

Matt??

Bill Hubbell,
President, Stock Corvair Group

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Re: Spun Bearing on Pinion Shaft?
Posted by: toms73novass ()
Date: September 08, 2018 06:11AM

OK, had to watch it in internet explorer.... boy that site is a hot mess!! hot smiley

Yup that bearing is shot. Also, the pinion gear is too loose. Probably the pinion shaft surface is toast.

-Tom


63' Monza Spyder Convertable (in process) MY Build Thread
65' Monza MY Build Thread
73' NovaSS 454 Big block
86' BMW 325es
98' Dodge 2500 12v Cummins Diesel with 1200 lb torque!
98' VW Jetta TDI, for daughter
01' Audi Allroad Stage 3 twin turbo

NFCC
Grand Island, NY

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Re: Spun Bearing on Pinion Shaft?
Posted by: MattNall ()
Date: September 08, 2018 06:48AM

try again... click a few times and it works.





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Re: Spun Bearing on Pinion Shaft?
Posted by: gnvair ()
Date: September 08, 2018 07:02AM

Was the pinion shim still there? My 69 had a noise on decel. I pulled the top cover and found what was left of the pinion shim wadded up in the oil transfer holes between the differential and gear box. Some of it migrated into the gear box. Its fairly common for the pinion gears to get loose on the shaft. Once that happens the pinion shim spins and eventually comes apart. Another shaft and some Loctite 609 tightened mine up. But look at the splines inside your pinion gear. It might be too far gone at this point. All new bearings are highly recommended as well.

Lee J

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Re: Spun Bearing on Pinion Shaft?
Posted by: whubbell ()
Date: September 08, 2018 08:32AM

Yeah, the shim is still there - see photo - pen is pointing to the shim.

I’m pretty certain the pinion shaft is toast. I will have to replace it with a shaft from another PG rear axle - New PG pinion shafts are not available, so far as I know.

Any advise about setting up new shaft and bearings without the J-tools?

Bill Hubbell,
President, Stock Corvair Group

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Re: Spun Bearing on Pinion Shaft?
Posted by: davemotohead ()
Date: September 08, 2018 08:38AM

That is toast, you will need to replace the ring and pinion gears also, this is a common failure due to low gear oil level in the diff, that front bearing gets oiled from the trough up top, gear oil gets splashed into the trough and the oil runs down a hole to the bearing, if the level is too low from a leak that bearing runs dry. I find more loose pinion gears on PG's than Manuals for some reason.





Email me at: Dave Motohead

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

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Re: Spun Bearing on Pinion Shaft?
Posted by: steve c goodman ()
Date: September 08, 2018 08:58AM

I have seen more PG diff pinion gears loose too.
I always guessed it was because of the shock of
dropping into gear with higher RPM and most of the
time the brake is on so the gears have no easy
way to absorb some of the 'bang' into gear.

Stick shifts are more a combination of car
movement while power is being added so shock
is less.

Just my guess of course.

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
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Re: Spun Bearing on Pinion Shaft?
Posted by: joelsplace ()
Date: September 08, 2018 10:16AM

If you are using the same gears and case and the shim isn't worn you should be able to use the same shim. The new bearings are very precise so that shouldn't bother it. I've always used Timken bearings.

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Re: Spun Bearing on Pinion Shaft?
Posted by: vairchet ()
Date: September 08, 2018 10:23AM

Is this reusable?

Chet in Ramona

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Re: Spun Bearing on Pinion Shaft?
Posted by: whubbell ()
Date: September 08, 2018 10:36AM

I don’t think it would be a good idea to reuse the shim if the bearing has been spinning.

Bill Hubbell,
President, Stock Corvair Group

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Re: Spun Bearing on Pinion Shaft?
Posted by: jjohnsonjo ()
Date: September 08, 2018 10:47AM

My guess is that the manual trans and diff hold more combined oil. If you have a small leak at exactly the same rate, then the oil level in the diff will go down faster with an auto since there is less total fluid. A guess.

J.O.

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Re: Spun Bearing on Pinion Shaft?
Posted by: 66vairman ()
Date: September 08, 2018 11:27AM

I agree with motohead - good used shaft and ring and pinion needed. Once worn in the ring and pinion should be kept as a matched set.

On the three LM PG diff's I've dismantled for ring and pinion gears I found NO shim. Not much of a sample I know, but struck me as odd. Gear patterns were fine.

On the manuals I made a slip pinion gear shat (cut down and had worn pinion gear splines so gear slips on and off easy) to select the shim.

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Re: Spun Bearing on Pinion Shaft?
Posted by: joelsplace ()
Date: September 08, 2018 12:53PM

Just use the tool!

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Re: Spun Bearing on Pinion Shaft?
Posted by: whubbell ()
Date: September 08, 2018 03:21PM

But....

I...DON’T...HAVE...THE...TOOLS!!!

Maybe you’d like to lend them to me? I’ll pay shipping!!

Bill Hubbell,
President, Stock Corvair Group

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Re: Spun Bearing on Pinion Shaft?
Posted by: joelsplace ()
Date: September 08, 2018 04:27PM

I think mine is missing a block. I plan to make it next time I am setting one up. I don't know the dimensions to make it without figuring it out. Does someone have the block they could measure? The 2 blocks in my kit are for other applications I think. I have J-6266-5 and -7. The -5 is Corvair but there is another one in the service manual without a number. Does anyone know the part number?

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Re: Spun Bearing on Pinion Shaft?
Posted by: davemotohead ()
Date: September 08, 2018 04:45PM

Steve Goodman taught me to hone out the center of a new bearing to make it a slip fit and it saves tons of time, no special tool needed for finding the correct shim.





Email me at: Dave Motohead

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

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Re: Spun Bearing on Pinion Shaft?
Posted by: toms73novass ()
Date: September 08, 2018 04:58PM

davemotohead Wrote:
-------------------------------------------------------
> Steve Goodman taught me to hone out the center of
> a new bearing to make it a slip fit and it saves
> tons of time, no special tool needed for finding
> the correct shim.


That is the method I use and it works well, just the price of a bearing.

-Tom


63' Monza Spyder Convertable (in process) MY Build Thread
65' Monza MY Build Thread
73' NovaSS 454 Big block
86' BMW 325es
98' Dodge 2500 12v Cummins Diesel with 1200 lb torque!
98' VW Jetta TDI, for daughter
01' Audi Allroad Stage 3 twin turbo

NFCC
Grand Island, NY

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Re: Spun Bearing on Pinion Shaft?
Posted by: joelsplace ()
Date: September 08, 2018 05:31PM

That is way cheaper and more foolproof than the tool. Good idea.

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