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Wonder Why My Clutch was Slipping.....
Posted by: MtnVairMike ()
Date: September 03, 2019 07:12AM

Well maybe someone can see why my clutch was slipping....eye rolling smiley

At least I got to try out my hydraulic lift table which made it much easier to drop the powerpack and raise the car up on the lift too.

Now to see what caused the clutch disk to fail. Pressure plate took it hard but the flywheel may get a pass. Looks like I lucked out and already had a bolted one installed before.

Later...

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: Phil Dally ()
Date: September 03, 2019 07:24AM

I hate when that happens!!!

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Re: Wonder Why My Clutch was Slipping.....
Posted by: corventure Dave ()
Date: September 03, 2019 08:13AM

I have actually seen the clutch material cracked on disk's that were rebuilt and fracture when the rivets were slammed in.
Just one more thing to check before installing a rebuilt clutch.

Now would be a good time to check flywheel axial and radial runout. Also have the units balanced.

Corventure Dave

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Re: Wonder Why My Clutch was Slipping.....
Posted by: MtnVairMike ()
Date: September 03, 2019 08:25AM

Dave,

Thanks. Car ran and shifted beautifully for the last 5-6K miles I've owned it, just started slipping and got worse.

Flywheel looks pristine and is a bolted one, will post that photo later. The pressure plate certainly took it in the shorts though...

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: 2ragtops ()
Date: September 03, 2019 08:53AM

Mike

Please invest the time and money on the flywheel.

Yes it may look good, but...………….

The fact that it is bolted suggests that it may be out of round.
The fact that it has never been done...……. and needs it.

When they are done, your car will shift smoothly and effortlessly
and the clutch will wear evenly. Please consider this. As Dave said!!!

Bob Bauer

Show-Me Corvairs

1966 Monza Convert 140 P/G with A/C, plastic wheel with tele-column am-fm posi-traction
1966 Corsa Convert 180 wood wheel tele-column am-fm sport steering posi-traction
1965 Corsa Coupe Crown V8 temporarily red lined for repair
House Springs, Missouri

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Re: Wonder Why My Clutch was Slipping.....
Posted by: vairchet ()
Date: September 03, 2019 09:45AM

8" clutch disc installed in a 102hp '62 Monza:

Chet in Ramona

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Re: Wonder Why My Clutch was Slipping.....
Posted by: Layton Curtis ()
Date: September 03, 2019 10:07AM

I have 2 new friction discs for a 8x6 clutch in my archives. That are left over from the time I worked for a clutch Factory in the sixties. (HK Porter) Free to anyone who asks for the shipping. I think they were stock for the 62's.

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Re: Wonder Why My Clutch was Slipping.....
Posted by: 63turbo ()
Date: September 03, 2019 06:23PM

I exploded a clutch disk years ago during a really high rpm shift... something like 6500-6800, and it scared the living daylights out of me, as I didn't know what happened. After getting the engine out and inspecting the carnage, the source of the problem turned out to be oil that had gotten on the clutch disk, and the material that the disk was made from, which was a carbon based material... this stuff DOES NOT tolerate any oil on it at all. I had the flywheel and pressure plate surfaces reconditioned, and rebalanced, and went back to a O.E. clutch material, and fixed the source of the leak. No more grenaded clutch plates!

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

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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Re: Wonder Why My Clutch was Slipping.....
Posted by: Frank DuVal ()
Date: September 03, 2019 09:42PM

Picture of both sides of the flywheel may give us an idea of who bolted the flywheel.

Frank DuVal

Fredericksburg, VA

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Re: Wonder Why My Clutch was Slipping.....
Posted by: Frank DuVal ()
Date: September 03, 2019 10:06PM

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

I can see WHY your clutch was slipping, it is only 8" in diameter! eye popping smiley

You need a 9" for a 140. Do you also have the weighted pressure plate?

Frank DuVal

Fredericksburg, VA

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Re: Wonder Why My Clutch was Slipping.....
Posted by: vairmech ()
Date: September 04, 2019 04:51AM

Couple of things, first the 8" disc actually gives you more clamping pressure as in lbs. per sq. in. The 8" will also shift faster because of the smaller dia.

I offer a 9 1/8" carbon/Kevlar disc. I know there was a post about carbon and oil but my facings are bonded to a steel backing so they can take more RPM. Besides, clutches are not supposed to have oil on them anyway!

On another note. Everyone stresses that the 180 and 140 engines need the weight lugs. This is absolutely not true. The ONLY reason to run the weight lug PP is because the plate is better material. It is easy to switch plates and re-balance. There are different pressure pressure plates but the lightest will hold a stock 180 engine.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Wonder Why My Clutch was Slipping.....
Posted by: MtnVairMike ()
Date: September 04, 2019 07:07AM

Well the autopsy showed oil or gear oil had gotten to the clutch over time.
Flywheel was toast, had gotten very hot probably from slipping.

Until the first slip occurred no problems, smooth drive and shift.

So now to get the parts list finished and ordered.

I will check on the clutch disc size and weighted pressure plate and advise those that asked.

Thanks,

Mike

Here is photo of clutch side of flywheel.

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: MtnVairMike ()
Date: September 04, 2019 07:20AM

At least the clutch gave it's all at the autocross last year and got me around for several more months....besides I got to get it ready for Vairs In The Valleydrinking smiley

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 09/04/2019 07:21AM by MtnVairMike.

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Re: Wonder Why My Clutch was Slipping.....
Posted by: Phil Dally ()
Date: September 04, 2019 07:37AM

Make sure the flywheel you buy is a Corventure Dave unit...THE BEST!!!

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Re: Wonder Why My Clutch was Slipping.....
Posted by: Setterz54 ()
Date: September 04, 2019 10:49AM

They look like they could cause a problem!

Setterz54
Fulton,MD.

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Re: Wonder Why My Clutch was Slipping.....
Posted by: WhenIm64 ()
Date: September 04, 2019 12:24PM

Years ago, the clutch disc in my Rampside disintegrated during the 1-2 shift coming out of a toll booth. One moment I was accelerating and the next moment I had a box full of neutrals... in the far left lane! Somehow I managed to coast to the shoulder, and called for a tow. (I called for a tow by walking to a phone booth. Remember phone booths?)

This was so long ago that Nixon was still president and the repair was performed by a Chevy dealer.

Here's the truck, circa 1972:

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Re: Wonder Why My Clutch was Slipping.....
Posted by: jetcat ()
Date: September 05, 2019 03:58AM

At our event last June, one of the entrants car died on the way. Our club member Mike Thomas volunteered to pull the power pack out and repair it. This is what he found with no evidence of any clutch material in the bell housing. It's like aliens abduct the clutch material without a trace. Check out the rivets, almost no scrape marks.

Bob
Paso Robles, CA

Central Coast Corsa
1966 Turbo Corsa convertible
1966 Corsa 140 coupe but now with 110hp heads.

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Re: Wonder Why My Clutch was Slipping.....
Posted by: MtnVairMike ()
Date: September 05, 2019 06:22AM

Frank DuVal Wrote:
-------------------------------------------------------
> Picture of both sides of the flywheel may give us an idea of who bolted the flywheel.


Frank,

Photos of both sides of the flywheel as requested.
What does that tell you?

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: MtnVairMike ()
Date: September 05, 2019 06:25AM

Frank DuVal Wrote:
-------------------------------------------------------
>
Quote
Mike
> 1966 Monza Convertible, 140HP-4 speed, Ermine White
>
>
> I can see WHY your clutch was slipping, it is only 8" in diameter! eye popping smiley
>
> You need a 9" for a 140. Do you also have the weighted pressure plate?


Frank,

See attached photo and consider getting a new ruler....grinning smiley
9" clutch disk.

140 weighted PP, see evidence.

Don't have a clue why the photos posted upside down.


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 06:32AM by MtnVairMike.

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Re: Wonder Why My Clutch was Slipping.....
Posted by: MtnVairMike ()
Date: September 05, 2019 06:52AM

OK folks, last post for today got to get back to work. Sorry about the serial posts to answer everyone's questions.

Here are my questions for the experts here:

Suggested sources for flywheels, pressure plates, clutch disks?

Anyone used the hot riveted flywheel from Clark's? Pro's/Con's versus bolted?

Likely sources of oil leak that got inside to the clutch/pp/Flywheel?
(Confirmed it with UV dye last night, 15 min drive before the teardown.

Will check back tonight.

Thanks allsmiling bouncing smiley

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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