Clutch "flare"

[A26B]

Originally Posted by Ccmano

Keep in mind the flywheel has a “cup” designed into the surface.

Best article on the subject by Mark Haibeck

http://www.zr1specialist.com/HAT%20W...0in%202019.pdf

H

Hans,
You mentioned "the flywheel has a "cup" designed into the surface. Several months ago, I was inspecting several OE DMF's. All still have the machine tooling marks present. I found that they had about 0.005" ~ 0.006" "dish" or "cup" as you prefer, down towards the center. Do you mind telling me where you derived your statement? I have been hesitant to sell either of these flywheels and your comment is the first I have heard of this.

I read Marc's document from the link you posted. He mentions the pressure plate having an 0.008" cup, but nothing about the flywheel.

Thanks,
Jerry

[Ccmano]

Originally Posted by A26B

Hans,
You mentioned "the flywheel has a "cup" designed into the surface. Several months ago, I was inspecting several OE DMF's. All still have the machine tooling marks present. I found that they had about 0.005" ~ 0.006" "dish" or "cup" as you prefer, down towards the center. Do you mind telling me where you derived your statement? I have been hesitant to sell either of these flywheels and your comment is the first I have heard of this.

I read Marc's document from the link you posted. He mentions the pressure plate having an 0.008" cup, but nothing about the flywheel.

Thanks,
Jerry

Jerry,
Haibecks article quoted here does have that statement. He says the flywheel has a “cup” of 0.010”. Page 4 under the paragraph that leads with “Inspection of the Dualmass Flywheel “
H

[A26B]

Originally Posted by Ccmano

Jerry,
Haibecks article quoted here does have that statement. He says the flywheel has a “cup” of 0.010”. Page 4 under the paragraph that leads with “Inspection of the Dualmass Flywheel “
H

Your are absolutely right! I only read the first page & thought that was the entirety of it. I will have to ask Marc where he obtained the flywheel cup information.

[Weeberone]

Have any of you ever attempted to replace a clutch with the car on jack stands? There's no real surprises here, are there? just a heavy transmission.
Remove exhaust, remove C-beam and drive shaft, remove transmission (hard part), remove bell housing and you're there?
I do have a service manual, but sometimes others experiences can be even more helpful.

[Ccmano]

Originally Posted by Weeberone

Have any of you ever attempted to replace a clutch with the car on jack stands? There's no real surprises here, are there? just a heavy transmission.
Remove exhaust, remove C-beam and drive shaft, remove transmission (hard part), remove bell housing and you're there?
I do have a service manual, but sometimes others experiences can be even more helpful.

With a decent transmission jack it’s very doable on Jack stands. I’ve done several. The C-beam can be trickier due to the limited working room. It’s really pretty straight forward. The trans is very heavy ~150lbs. So doing the old drop on to your chest is not recommended. Don’t forget to support the engine, once the C-beam is out there nothing holding the back of the engine.
H

[Paul Workman]

Originally Posted by Ccmano

With a decent transmission jack it’s very doable on Jack stands. I’ve done several. The C-beam can be trickier due to the limited working room. It’s really pretty straight forward. The trans is very heavy ~150lbs. So doing the old drop on to your chest in not recommended. Don’t forget to support the engine, once the C-beam is out there nothing holding the back of the engine.
H

Point of interest, IOW, another way to skin a cat?

Before I removed the ZF trans (on my 95 LT1 car) I asked Bill Boudreau (ZFdoc) about a transmission jack; where to buy and what to buy, etc.

Bill told me he doesn't use one. Instead, he puts the cup of the floor jack at the balance point under the trans and that's all he said he ever uses. (Wha-wha-whaaat???)

So, I tried it and he was right! I pulled the trans, installed a new one (in the 95 LT1 car), and I have pulled the trans on the Z a couple of times now...easy peasy. Yup! The monster will balance sweetly on the cup of the floor jack like a ballerina on tippy toes, and roll right out or back under the car all the while riding on the cup of the floor jack. And, as Bill said, he prefers to do it that way b/c he can align the angle of the trans with the clutch more easily. Well, I'll have to take his word on that, cuz I've never used a trans jack. But, the plain ol' floor jack worked like he said on 3 different occasions.

And, then there's Lee Gaffgan... Some years back Lee posted a video of him installing a ZF trans by himself while standing under his Z on a hoist. Lee bent over and picked the trans up off the floor, then "bench pressed" it head-high, and proceeded to stab it into the bell housing!

The only question I had was, why didn't I think of that?? .....yeah, right!!

But, back to the clutch thing for a minute:

I've replaced the clutch disc twice on the Veleo (OE) clutches on two different cars, and once after swapping in a Fidanza FW. On no occasion did I resurface the FW - left it untouched (surface was not scored/damaged, only fine surface wear lines). Break-in (following Marc Haibeck's suggestion) ( simply babied the clutch for the first 500 miles to let the disc conform to its new surroundings (and the cup of the Veleo PP): never had a problem in 20k miles, even after the few passes at a drag strip.

YMMV!

[WARP TEN]

For the record, Marc Haibeck does not have a lift in his shop. He and Bob do everything under the cars with them on jackstands. --Bob

[Paul Workman]

Originally Posted by WARP TEN

For the record, Marc Haibeck does not have a lift in his shop. He and Bob do everything under the cars with them on jackstands. --Bob

And....I'm not sure Marc has to use jackstands either!

[WARP TEN]

Originally Posted by Paul Workman

And....I'm not sure Marc has to use jackstands either!

Well Paul, we tried to fatten him up yesterday at lunch but I think you are right--he can still slide under without using jack stands!-Bob

[Weeberone]

So I attempted to order the shims needed in order to use the Centerforce clutch disk as recommended in the Marc Haibeck article. I ordered from McMaster-Carr figuring they would be a stand up company as also recommended in Marc's article. This is the response I got for trying to order 6 shims to Jupiter's moon known as Canada:

"Hi Chris,



Due to the cost and complexity of shipping our products to Canada, we are only able to accept orders from businesses and schools. We’ve canceled your order. If this material is not for personal use, please resubmit your order online using the business or school name.



Jennifer

330-995-5989"

hmmm. Six shims. Pretty complex. I guess I'll source these locally.