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Re: Wonder Why My Clutch was Slipping.....
Posted by: Phil Dally ()
Date: September 05, 2019 08:28AM

Only one choice when it comes to flywheels...Corventure Dave's.

Not sure if that is what Clark's sells but CA Corvair for sure.

We have used numerous flywheels from Dave with no issues ever.

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Re: Wonder Why My Clutch was Slipping.....
Posted by: joelsplace ()
Date: September 05, 2019 09:37AM

Oil or gear lube?
Gear lube pretty much only comes from the shaft seal but could be a crack or leak around the snout and case but I've never had that happen.
Engine oil - Bad seal, leak from flywheel bolts, leak from bell housing bolts, crack in bell housing, paper gasket between crank and crank gear.

Joel
Northlake, TX
5 Ultravans, Lost count at 100 Corvairs...

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Re: Wonder Why My Clutch was Slipping.....
Posted by: Marco_a_p ()
Date: September 05, 2019 11:53AM

if that flywheel has numbers stamped on the back side, it could be a palmer flywheel already.

Marco
A 62 Monza Wagon, a 63 GB 8door, a 62 R/s and a 65 Corsa Turbo coupe..

Hanging out with the scorpions, king snakes, road runners, coyotes and quails In the southern desert of the silver state
Mesquite NV 89024

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Re: Wonder Why My Clutch was Slipping.....
Posted by: Phil Dally ()
Date: September 05, 2019 12:14PM

That is NOT a Palmer flywheel...he only uses hot rivets.

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Re: Wonder Why My Clutch was Slipping.....
Posted by: MtnVairMike ()
Date: September 05, 2019 12:28PM

joelsplace Wrote:
-------------------------------------------------------
> Oil or gear lube?
> Gear lube pretty much only comes from the shaft seal but could be a crack or leak around the snout and case but I've never had that happen.
> Engine oil - Bad seal, leak from flywheel bolts, leak from bell housing bolts, crack in bell housing, paper gasket between crank and crank gear.


Engine oil, confirmed with UV dye and blacklight after spirited 15 minutes drive before the teardown.

Lots of cleaning while I put together my parts order. Leaning towards the hot rivet flywheel. Who carries that besides Clarks and Mike's Corvair Parts?

Mike

1966 Monza Convertible, 140HP-4 speed, Ermine White

Others in the menagerie...
72 Corvette Stingray, 58K miles, owned since 86
72 MGB, 112K miles, bought from original owner in 09
78 Chevy pickup, 124K miles, bought new in 78
93 Corvette, LT1/6spd, 210K miles, daily driver since 96



Edited 1 time(s). Last edit at 09/05/2019 12:30PM by MtnVairMike.

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Re: Wonder Why My Clutch was Slipping.....
Posted by: MattNall ()
Date: September 05, 2019 01:00PM

Corventure Dave here makes them.... he can tell us

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

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Re: Wonder Why My Clutch was Slipping.....
Posted by: corventure Dave ()
Date: September 05, 2019 01:06PM

I primarily do the Hot Forged rivet method assembling flywheels. I developed the system and started doing this in 1978. These are available from several venders.
I actually also do bolted flywheels by request for California Corvairs.

I try not to get into loooong posting discussions about the differences of the two procedures. However over the years I have came across quite a few bolted flywheels, some done by one of the most popular builders who is no longer around, and that have the bolts come lose. I have one that I set out for demonstration at the Toss each year.

As for the Hot Forged riveted flywheels, I have never had one come back with a lose rivet failure.

The bottom line is that if the flywheel is rebuilt "properly", it will be a good reliable unit, regardless the procedure. However there have been an awful lot of, lets say, questionable attempts to repair a lose Corvair flywheel!

This one Mike pictured above is Not one of mine.

Corventure Dave

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Re: Wonder Why My Clutch was Slipping.....
Posted by: Frank DuVal ()
Date: September 05, 2019 06:49PM

Interesting. I have only seen one other 9" disc with the single row of rivets. I see more 8" discs with the single row of rivets. Most every 9" disc has two rows of rivets See pictures at Clarks or Californiaa Corvairs.

I have seen those Allen head bolt bolted flywheels before. But I see no numbers in Sharpie or stamped on the surface.

Frank DuVal

Fredericksburg, VA

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Re: Wonder Why My Clutch was Slipping.....
Posted by: vairchet ()
Date: September 05, 2019 07:17PM

Frank,

Here's a visual comparison (you're correct, most 9" clutch discs do have double rows of rivets [look to bottom of page]): [corvaircenter.com]

Chet in Ramona

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Re: Wonder Why My Clutch was Slipping.....
Posted by: vairchet ()
Date: September 05, 2019 07:28PM

Forgot to add this bit of information: [corvaircenter.com]

Chet in Ramona

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Re: Wonder Why My Clutch was Slipping.....
Posted by: MtnVairMike ()
Date: September 06, 2019 06:16AM

Chet, Frank, Dave,

Thanks for all the input. Leave it to me for my first Corvair clutch experience to bring up a puzzler.

The car came from a long time collector who owned it from 1991-2016.

Definitely leaning to the Dave hot riveted special.

Thanks

Mike

1966 Monza Convertible, 140HP-4 speed, Ermine White

Others in the menagerie...
72 Corvette Stingray, 58K miles, owned since 86
72 MGB, 112K miles, bought from original owner in 09
78 Chevy pickup, 124K miles, bought new in 78
93 Corvette, LT1/6spd, 210K miles, daily driver since 96



Edited 1 time(s). Last edit at 09/06/2019 06:16AM by MtnVairMike.

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Re: Wonder Why My Clutch was Slipping.....
Posted by: MtnVairMike ()
Date: September 06, 2019 06:27AM

...forgot to ask does Clark balance their flywheels/pressure plates as an assembly or separately when you order?

Thanks,

Mike

1966 Monza Convertible, 140HP-4 speed, Ermine White

Others in the menagerie...
72 Corvette Stingray, 58K miles, owned since 86
72 MGB, 112K miles, bought from original owner in 09
78 Chevy pickup, 124K miles, bought new in 78
93 Corvette, LT1/6spd, 210K miles, daily driver since 96

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Re: Wonder Why My Clutch was Slipping.....
Posted by: jjohnsonjo ()
Date: September 06, 2019 02:58PM

corventure Dave Wrote:
-------------------------------------------------------
> I primarily do the Hot Forged rivet method assembling flywheels. I developed the system and started doing this in 1978. These are available from several venders.


And just think, GM could have done it right in the first place for a few cents more. They knew they had a problem by 62/63 or so. You'd think they would have made the replacement parts correct, but then what would we have to talk about. My brothers 63 crapped out in late 65, took me a few more years for mine to go.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa


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Re: Wonder Why My Clutch was Slipping.....
Posted by: RexJohnson ()
Date: September 07, 2019 09:35AM

Dave from DALE mfg told me that the '60 had 1/4" rivets and then in '61 they went up to and stayed with 5/16". So GM must have known of the problem very soon. He used the allen head bolts and wrote the specs of each flywheel with a sharpie in the center. Those specs must have been for the original purchaser because they faded fast with a good cleaning. I am not sure if anyone else used those allen head bolts to know whether this is a DALE flywheel. If it was a DALE flywheel I would clean it and use again as I have many times.

RJ tools
Salem,Oregon

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Re: Wonder Why My Clutch was Slipping.....
Posted by: Layton Curtis ()
Date: September 07, 2019 12:10PM

I have bolted a few with the 5/16x3/4 Low Head Allen bolts. If I was using inch type that would be my choice but I use 7mmx20mm long with nuts and LW.

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Re: Wonder Why My Clutch was Slipping.....
Posted by: dryenko ()
Date: September 10, 2019 07:39PM

Clarks does NOT balance any of their rebuilt pressure plates.
I have had several shipped to me that were way out of balance.
They ship what their repair vendor sends them.
When I put the center ring back where it belonged , they were close , but still needed balancing.
Turns out the vendor they use does not bother to match mark and reinstall the ring in the factory location.
Buyer beware.

Bob C aka Dryenko
Dobson, NC 27017

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Re: Wonder Why My Clutch was Slipping.....
Posted by: jjohnsonjo ()
Date: September 11, 2019 05:15AM

I had a flywheel and PP from them. Had the balance checked and they were both way out. It would have taken a lot of weight to balance separately. Then he showed how close he could get by indexing them as a pair. It only took a very small weight. Since this car doesn't get many miles and I did expect to be changing it again I went that route.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa


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Re: Wonder Why My Clutch was Slipping.....
Posted by: MtnVairMike ()
Date: September 11, 2019 08:31AM

Thanks for the balancing replies. So what is a guy to do?
Try to get it balanced locally?
If either the flywheel or PP have to be balanced does that void Clarks warranty?

Thanks,

Mike

1966 Monza Convertible, 140HP-4 speed, Ermine White

Others in the menagerie...
72 Corvette Stingray, 58K miles, owned since 86
72 MGB, 112K miles, bought from original owner in 09
78 Chevy pickup, 124K miles, bought new in 78
93 Corvette, LT1/6spd, 210K miles, daily driver since 96

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Re: Wonder Why My Clutch was Slipping.....
Posted by: corventure Dave ()
Date: September 11, 2019 11:16AM

RexJohnson Wrote:
-------------------------------------------------------
> Dave from DALE mfg told me that the '60 had 1/4" rivets and then in '61 they went up to and stayed with 5/16". So GM must have known of the problem very soon. He used the allen head bolts and wrote the specs of each flywheel with a sharpie in the center. Those specs must have been for the original purchaser because they faded fast with a good cleaning. I am not sure if anyone else used those allen head bolts to know whether this is a DALE flywheel. If it was a DALE flywheel I would clean it and use again as I have many times.

=========================================================================

Actually... The many of the 1960 flywheels started out with 3/16 wide cold set rivets. This was changed to the larger standard 1/4 inch wide cold pressed rivets throughout the production years.

The tapered Allen head aircraft grade cap screws are a common fastener used. I accommodate these. Dale's flywheels indeed have the runout specs written in the center plate. Some of these are still visible after many years. The other way to identify the Dale unit is the backing plate is painted Black. This helps cover any Clutch or bell housing bolt contact or scraping marks.

Corventure Dave

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Re: Wonder Why My Clutch was Slipping.....
Posted by: MtnVairMike ()
Date: September 17, 2019 06:35AM

Got to love the tech support at Clark's. Got a very quick reply to my questions about balanced flywheels and pressure plates.

They don't supply them as balanced when shipped
Balancing locally doesn't void their warranty..

smileys with beer

Mike

1966 Monza Convertible, 140HP-4 speed, Ermine White

Others in the menagerie...
72 Corvette Stingray, 58K miles, owned since 86
72 MGB, 112K miles, bought from original owner in 09
78 Chevy pickup, 124K miles, bought new in 78
93 Corvette, LT1/6spd, 210K miles, daily driver since 96

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