My clutch issue

[mgbrv8]

Okay I finally got a chance to pull my ZR1 tranny this weekend.
First off let me tell you what happened I was driving it back from the body shop when I depressed the clutch and it only traveled halfway and didn’t come up or down. I pulled the slave off and confirmed that hydraulics were not at fault.
When I got the tranny off I noticed the throw out bearing was grenaded and causing the travel issue. But the weird thing was that one flywheel screws was completely unthreaded and rattling around in the space between the clutch disk and the fadanza flywheel and three were threaded out 1/8th to 1/16th of an inch that would explain the strange sound I was hearing at ideal and on shifts. It seemed like it had some type of locktite on the threads so it makes me wonder if it was the wrong heat range locktite. Also there was evidence that the crank shaft idealer bearing was damaged in the past installation due to the needle bearings falling out when the transmission was removed it seems that there were alignment issues during the last installation causing the damage. I still need to check the transmission fluid for debris and dismantle the trans to look for damage. Needless to say where do I go from here? The clutch, pressure plate and throwout bearing were valeo brand. I don’t think I want to go back with it. Also my fadanza flywheel has chatter markes on half of the clutch surface probably due to the loosened bolts on half of the flange. I need to put it on my granite surface table and used my height gauge to see if its warped. If it is warped what’s a recommended replacement. If it isn’t can these clutched be resurfaced? Now I don’t want to go back with a factory flywheel so I cant use the factory clutch what clutch should I used? Id like to use a clutch disk with springs in it. Also what idealer bearing do you guys recommend? Any advice, suggestions or resources would be greatly appreciated

[XfireZ51]

The Fidanza has a replaceable steel clutch face. You can order one from them. As for the clutch disc, you should use a sprung hub disc design like the LT-1 Camaro style. This helps absorb the vibrations from the motor to the ZF and minimize the gear clatter at idle. On the pressure plate bolts, I ordered the longer ones from SRP.

"Extended Length Pressure Plate Bolts
Custom length pressure plate bolts ensure adequate thread engagement (unlike OEM fasteners) when installing a Fidanza Aluminum Flywheel. Complete with over-sized ground washers and bottoming tap (additional thread cutting is required). For use with factory style LT5 pressure plate."

[tccrab]

Lots of good info here:

http://www.zr1netregistry.com/forum/...ead.php?t=4489
http://www.zr1netregistry.com/forum/...ead.php?t=1536

Measure the bolts on yours.
It is possible the wrong ones were used or just not torqued correctly.
Either way, something wasn't right.

TomC
"Crabs"

Originally Posted by mgbrv8

But the weird thing was that one flywheel screws was completely unthreaded and rattling around in the space between the clutch disk and the fadanza flywheel and three were threaded out 1/8th to 1/16th of an inch that would explain the strange sound I was hearing at ideal and on shifts.

You are talking about the screws that hold the friction ring to the flywheel?

[mgbrv8]

Sorry for the late reply my internet is on the fritz. The bolts that are loose are the ones that hold the flywheel on to the crankshaft. And I really appriciate all the help so far.

Dave

[XfireZ51]

Originally Posted by mgbrv8

Sorry for the late reply my internet is on the fritz. The bolts that are loose are the ones that hold the flywheel on to the crankshaft. And I really appriciate all the help so far.

Dave

WOW! The bolts onto the crankshaft??

[mgbrv8]

Yup three were loose and one was off and the rest were holding. Would you guys recomend the needle bearing type or bronze type imput shaft bushings?

Dave

[jonszr1]

i like the bronze one .but if you use that one use no grease on it when installing the trans

[flyin ryan]

Originally Posted by mgbrv8

Would you guys recomend the needle bearing type or bronze type imput shaft bushings?

Dave

I put a Needle Pilot Bearing in my 90, but i've used both, often. Your choice...either or, not a big deal one way or the other.

Originally Posted by mgbrv8

Sorry for the late reply my internet is on the fritz. The bolts that are loose are the ones that hold the flywheel on to the crankshaft. And I really appriciate all the help so far.

Dave

Sounds like maybe the wrong size bolts were used. They should never back out. I would double check to see what the actual thread pitch and bolt size is.

Use the bronze fluted bushing.