What did I break!!!

THE BULL · 12-05-2022, 11:27 AM

Quote:

Originally Posted by 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.

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 · 12-06-2022, 12:04 AM

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 · 12-06-2022, 02:47 PM

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.

ZoomZ · 12-07-2022, 11:48 AM

Quote:

Originally Posted by 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.

The best method is to hold flywheel through the Provided access panel, with the proper flywheel holding tool (or home made tool)

I understand what Dreadnaught is saying and 100% accurate. However, there was a slight turn of gear train before transmission held everything. Thats when I think I did it.

Again, to reiterate, this is only a theory at this point. I know I added some pictures and suggested i found the problem, but nothing is certain yet.

I'm hoping to have it off this weekend.

Thanks for your response.

.

zz

12-06-2022, 02:47 PM	#3 (permalink)
stansens Base Member Join Date: Nov 2015 Location: toronto, canada Posts: 146 Drives: 2016, 370z Rep Power: 193	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. ZoomZ likes this.

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12-06-2022, 12:04 AM	#2 (permalink)
ZoomZ Track Member Join Date: Jan 2017 Location: Vancouver, BC Posts: 801 Drives: 17' 370Z Nismo Rep Power: 40656	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.