What did I break!!!

ZoomZ

After the failed attempt at changing my crank pulley,
see thread here: Lets talk pulley

My clutch pedal engagement is now very high and I want to say softer feel. Not certain on feel but definitely higher engagement.

A little back story, if you don't read the pulley thread. I had the gear in 6th and PB set while trying to break the crank pulley bolt loose, turning engine backwards. I tried 1st gear, but it engine was turning.

I put a lot of force on the breaker bar. I did hear a clunk once I released PB and put xmission in neutral after many attempts.

Anyway, changed the serpentine belt, put everything back together and went for a drive.

No noises, no gear grinding or poor engagement of gears. No clutch slippage in all phases of throttle. No CEL or others. Car seems to be driving normal.

Starting in 1st, its high engagement but I feel the clutch grab. Going from 2nd to 3 or 4th to 5th, it's high pedal engagement but I feel no definitive "grab". If I try to press gas based on my habits and middle clutch pedal engagement, obviously car will surge forward based on higher engagement.

My only guess is that I have deformed the Diaphragm springs on clutch cover.

31,000 Miles on OEM components.

Any other thoughts/suggestions?

(p.s. This is not Placebo effect. It's definitely changed )

SG4247

What action would have deformed the diaphragm spring?
The clutch was “off” during the pulley fiasco right?

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Rusty

The clutch issue is unrelated to the crank pulley.

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ZoomZ

Weird. I hate when coincidence sh*t like this happens.

ZoomZ

Wouldn't clutch be engaged?. It's when you push pedal that it disengages.

Anyway, I don't know what would cause it to be deformed. I'm only eliminating possibilities.

phunk

The starter turns the flywheel ring gear which is attached to the crankshaft directly. I don't see how it could effect the clutch at all unless you actually worked the flywheel off, which wouldnt happen, and would cause crank trigger issues and lots of noise if you did.

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ihaveashihtzu

It seems that he left the car in gear to hold the crank from spinning vs. using the starter and breaker bar on the ground method.

phunk

Yes, but the clutch is not between the flywheel and crank pulley. The starter leveraged the flywheel, which transferred torque through the crankshaft to the pulley bolt and tools he had wedged up. There would be no unusual stress to the clutch assembly while doing this.

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ihaveashihtzu

From his old thread he mentioned he didn't use the starter at all, no?

He left it in gear and tried to manually loosen the crank pulley bolt with a breaker bar.

What am I missing?

phunk

Someone said they bumped the starter, I thought that was him, but I guess it was someone else that said that.

If he got it off by putting the car in gear and using the drivetrain to keep the crankshaft from rotating, than it would have loaded the clutch concentrically, like when you drive.

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ZoomZ

I'll get a better idea once everything comes out. I'll post more pics too.

Dreadnaught

I still don't see how that part of the diaphragm got bent just by you trying to loosen your crank pulley bolt?

With the car in gear and the clutch pedal up, the clutch disc is in contact with the flywheel which spins the input shaft of the trans, the drive shaft then the wheels. The tip of the input shaft sits in the pilot bushing. The input shaft has splines which goes through and aligns with the clutch disc.

The throw out bearing makes contact with the diaphragm. It goes over the input shaft. When you push the clutch in, the CSC pushes on the diaphragm to disengage the clutch disc.

Are we not getting all the deets? Or am I just not thinking enough of how this could have happened?

Yes coincidences happen. I've fixed cars for what it came in for and as the lot attendant goes to take the car to the drive, the check engine light comes on for something else and I'm labeled as a thief.

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THE BULL

Highly possible that this was the final drop to a hurt pressure plate.

The most likely theory if it's not the previous one is that the clutch offered enough grab. You have to understand that the transmission was not giving in locking the entire drive train. You'd expect the clutch to give up however if the disc does catch and grab the drive train starts to put pressure forward since the wheels are trying to spin. This puts upwards and downwards pressures on the input and output shaft as well.

The more I keep explaining it starts to sound like this would really only happen on a hurt pressure plate, though possible that it has the ability to mess up a plate, if it's hurt (worn teeth) it will bend them

ZoomZ

We'll know better once the stuff comes out. (someday)

My theory is with BULL. Clutch disk grabbed on the clutch housing. Wether it was on it's way out, who knows.

I had NO issues or hints of issues with clutch, prior to crank pulley removal.

Puzzling..yes. Coincidence...maybe. I'm not dreaming this.

stansens

My thoughts are that the friction disc being held in place by the trans being in gear and parking brake engaged put sufficient forces on the pressure plate when you started to turn the crank bolt counter clockwise to loosen it. This action was opposite of the normal direction and usual forces etc. that have always been applied to this original pressure plate and it was sufficient force to slightly deform it which is why the diaphragm fingers are no longer in alignment. This means that the friction disc does not fully disengage when depressing the pedal so it is hard to shift from one gear to the next or from neutral into a gear. Outhouse luck and most likely a rare occurrence. I feel for you and as you know you need a new clutch. Release bearing, pilot bushing (or bearing in Nismo) pressure plate and friction disc is what will probably be needed as you have probably figured out. Thanks for posting so others use a different method to loosen this difficult crankshaft bolt.