300ZX (Z31) Forums Dedicated to 84-89 ZCars otherwize known as the Z31's

85 NA Original Clutch

Old 01-26-2019, 04:25 PM
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85 NA Original Clutch

I have 85 NA with 145K miles that has the original clutch. Now the clutch is stuck on the floor. There is still about an inch of movement when I press down on the clutch which still allows me to change gears, but not very well. I have heard that Z31 clutches are "bullet proof", but I guess after 34 years, the time has come. Thoughts?
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Old 01-27-2019, 09:12 AM
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Welcome to ZDriver! Yeah, the Z31's OEM clutch is amazing but a lot of its potentially long life depends on having the same driver who always treats it the same smart way. I think my original '86NA clutch lasted well over 200K miles, but I never popped or dragged it, not ever. It loved me back. Nor did I ever let anyone else drive her. No point in that. A jerk (we all know a few) can do permanent damage in 10 seconds.

Anyway, your clutch is over now, sounds like. It is a former clutch. (You checked lines, no leaks, have tried (working with a good mechanic) to restore pressure to pedal, think clutch cylinder is OK, etc.) You can always blame the guy(s) who had her before you. Amazingly low miles for your Z, if true, motor hardly even broken in at 145K original! Congrats. But get a competent professional diagnosis and a 'replacement-required' verdict before you start hunting for a new clutch assembly.

You will find it hard to get the exact same clutch feel as your OEM from your replacement clutch. The OEM (I remember well) just seemed to be a perfect match for the motor and torque. Viva amazing Nissan designers! And I know nothing about "rebuilding" a clutch, way above my pay-grade. Others have done it, however. So talk to whoever claims to be the clutch "expert" at your parts store and try to describe what you need in a replacement. I installed one that was so hard I replaced it after 50 miles. Truck city, much too hard. I could not match OEM exactly but at least found one that was tolerable. Good luck with this. Don't be too shy to switch out a bad new replacement (wrong feel for you). Hey, it's only money! Get it done right, buddy.

Last edited by zxguy1986; 01-27-2019 at 10:48 AM. Reason: why not
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Old 03-03-2019, 09:44 AM
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I had to replace my clutch at 76k... not an easy job on these! If you can get past the driveshaft bolts and the rusty exhaust bolts you’ve gotten past the hard parts. If you’re at this point, might as well do the throw out bearing, main seal, flywheel, and slave cylinder as well. Good luck!
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