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Showing results for '92mm'.
Found 52 results
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I think that the shift lever issue is a 240Z thing. I had a 78, 81, and 83 5 speed in my 76 at various times. All used the original 4 speed shifter with no problems. Also, I think that Dave WM is talkng about the 225mm versus the 240mm clutches. Different bolt patterns. The clutch collar needs to match the pressure plate height. 92mm. The fork pivot is in the same position on all except the very early 4 speeds. -
Well, figured I would offer a conclusion to benefit anyone reading through this thread in the future. Yes, the exedy 06009 clutch kit appears to be correct for the longer collar. Stacked everything up as described in other threads and appears to be exactly 92mm. Sent from my iPhone using Tapatalk -
I’m as perplexed as both of you. I think it’s just a hodgepodge of “make it work” pieces. Who knows. Like zed mentioned, I’m just replacing it all to be sure. Asked my machinist about lightening the flywheel while he was resurfacing it, but the cost would’ve been darn near the price of a fidanza aluminum piece. So I just decided to resurface it for $65. Done, picture attached. Now, selecting a clutch kit. The only 225mm kit that includes a collar, is the perfection clutch kit. It seems to be sold by summit and autozone as well, just with different branding (zoom, duralast). It’s economical and seems to have decent reviews. Zed, I know you weren’t a fan. But it’s the only kit that includes a collar and would eliminate that headache. I’d like to consider exedy, but it doesn’t come with a collar, so I’d then have to do the whole 92mm measurement mess and then spend another $50 on a collar, maybe. Unless someone can confirm that my existing collar will work with the exedy kit, I’ll prolly just order the perfection kit because I know the collar will be right… Sent from my iPhone using Tapatalk
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Current collar: 1.506" ( 38.25 mm) OA height 1.091" ( 27.7 mm) from the top to the milled flat So smaller than all 4 in post #130 If I went to the ZX collar I would theoretically gain 15mm. Making my stack up about 92mm. Does anybody have one? @Terrapin Z?
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So I have a new issue with Cody's car My clutch stack up is only 74mm with the current collar to the ears I believe this is the measurement from the fingers to the flywheel. So about 44mm Luk brand clutch kit Now the throw out bearing fits down in to the clutch fingers some. So maybe it is installed backwards?? I thought I might have a smaller TOB collar but at this point I'm not sure. Even if I have the smaller one, the difference over the 4 types looks to only be 10mm. That's not going to get me to 92mm??
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I had a spare clutch sleeve, think it was from a ZX, anyway with it sitting on top of the pressure plate fingers its about 105mm from the flange of the pressure plate to the very end of the throw out assembly (with old bearing sitting on the fingers). Its about 10mm from the end of the assembly to the point of contact where the fork rides. So overall about 95mm from the flywheel to the clutch fork. Somewhere around I think i saw 92mm as what this dimension should be. I will check it against the old one when I get it out to be sure. The quality of the excedy is so much better than the kit I got from auto zone years ago. the PP fit to the dowels pefectly and I like the made in japan bearing it came with (Koyo). -
Looks like your question now is "what brand"? Looks like the Exedy's only come with a bearing but no sleeve. So you'll want to measure and try to hit 92mm stack height. Or measure the old setup and match it. It would be interesting to see how close it is to 92mm.
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Funny, I wrote almost the same thing 7 years ago? Unfortunately a lot of people measure these collars in a why that makes no sense now. The most important measurement is the 92mm from the flywheel surface of the pressure plate to the contact point for the clutch fork. Those collar measurements you see 32, 42, 38 and 41 are not very handy to you because they measure the total length from the throwout bearing shoulder. They measure past the tab for the clutch fork.You can figure out what you need with some calculating and refering to the one you have. You can measure your pressure plate with the throwout bearing and collar and see how far off 92mm you are. Note the difference between your measurement and 92mm. Then measure your collar like in the photo with 32, 42, 38 and 41mm. Example: If you measure 82mm. That is 10mm short. Then measure your collar at 32mm. You will need the 42mm collar. Most aftermarket clutchs are based on the 75-83 280Z ZX couple clutches with that pressure plate. ALL this information is related to the pressure plate height. The picture of all the different collars I posted is very old and explained where all these different heights came from. The problem these days is there are so many Zeds running around with non original clutches and therefore no real relation to the A, B etc trnasmissions. -
Did you measure the stack height of the throwout bearing sleeve on the pressure plate? 92mm +/- a couple.
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So assuming this is my problem, and I'm about 7mm shy of 92mm, I should get the L26 or Type B 5 Speed? -
Ok, I didn't realize 92mm was universal. Thanks for that info. On my measurement picture, the end of my ruler is touching the workbench that the pressure plate is on. I am measuring from the workbench on up to the collar.
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Thanks Zed, I will do this and report back. I will also take note of where the "thunk" is coming from. I am glad to know my slave cylinder is operating in the full range of motion. That eliminates everything from the MC back. By the way, what is the origin of the magical 92mm stack height? Can you take a look again at the picture I posted of my stack measurement and give me your thoughts?
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Ah yeah, it's the monkey motion 71A. I probably should have reiterated that along the way. I just called my future father-in-law who gave me this car, and he couldn't recall ever having any major issues with the clutch - certainly never having to stomp the pedal to the firewall to get it to release. I'm assuming that means the old setup is valid, so I just need to figure out where the difference is between the new and old. I'll also try reinstalling the old clutch just to make sure. I've been assuming that the 92mm stack-up height is correct regardless, because that's the number I measured off of the old parts. However, in my 92mm measurements, both pressure plates have been just laying on the bench with the friction disk out of the equation. This discounts any difference in height of the pressure plate itself, and only measures the distance from the throwout ears to the flywheel-side face of the plate casing. It's definitely possible that the difference is actually in the pressure plate itself, which had been hovering above the bench when I measured. I'll do a side-by-side measurement of both the new and old pressure plates sitting on their respective disks and see if there is a difference. I'll also grab a reading of the bellhousing face to the pivot while I'm at it. Any idea what that is for a 71B? The transmission is still mounted to the engine, so I'll have to wait a few days until I have time to spend in the garage before I can do any more work. -
One of the threads in that search I linked has a picture of where to take the 92mm measurement. It's from the flywheel surface to the ears that the fork rides on. Set the sleeve on the pressure plate and measure. 92mm is not exact but if you get it it should work fine. It's kind of a "can't go wrong" number that many people have confirmed.
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Here's a bunch about it. You set the pressure plate on a flat surface, put the collar/sleeve with bearing on top, then measure to the top of the ears where the clutch fork contacts. There are pictures and drawings in some of these threads. https://www.classiczcars.com/search/?&q=92mm pressure plate&search_and_or=and&sortby=relevancy
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So I discovered something interesting over the past week regarding the age old issue of clutch throw out bearing collar height selection. We have discussed many many times how to determine what height the throwout collar has to be to achieve the now well accepted total 92 mm total height, based on your particular choice of clutch cover. What I remember in the many discussions I heard, is how the struggle to get a long enough collar almost always comes up. This lead me to assume that all that was available in new parts are clutch covers that are much thinner than the old stock 240z covers. What is new here, is that I have definitive measurements on two popular Exedy Clutch kits with very different heights! You can now choose the one that most closely matches your existing cover, and not worry much about finding a “matching” collar. In my recent experience of replacing several clutches for various cars, I have been buying the 280z spec clutch, 06009 part number, and it is much thinner (requiring a longer collar) than any of the stock OEM 240 clutch covers I’ve seen in the past (requiring a short-ish collar). My parts hoard has accumulated several of the shorter collars, and I’m always struggling to find longer collars to go with the thin pressure plates. I’ve even considered designing a two piece adjustable length collar to handle any situation. Well it turns out I ordered a 06029 kit the other day for a customer after having an old age brain fade, spec’ed for 240 and early 260. Got it out of the box and found the clutch cover is nearly 3/8 -1/2” inch taller than the 06009 kit. I will add the exact height of the spring finger tips with the cover bolted to a flywheel (yes, it very different) to use in your 92mm collar selection calculations shortly. Clearly Exedy has it straight since most 240 owners would have shorter collars, and need a thicker cover. 280’s have longer collars, needing thinner clutch covers. Not sure how I missed this, but what it means, is that there is a choice in clutch cover heights out there, you don’t always have to go hunting down the right(er) length collar. Just by the right clutch! I should note that the clutch disk in both kits are identical. Technically they have different part numbers, I can not see or measure any difference in the disks. Note this handles only the 225mm clutches, not the 2+2 240mm clutches. There were no 240mm spec clutches for 240z. It would be great to have a database of all the popular clutch brands and their clutch cover heights, something you can’t find in their published specs. So every time you replace your clutch, measure the cover height and record it here. Thank you. -
Got the 4mm thickness ring in there now, bearing pressed on just fine. engines in the car, we’ll see how it goes. I put in an adjustable length slave rod as well so I can tweak free play. I have to say, given all the clutch/ throwout collar combo’s I’ve seen that are quite different from the 92mm ideal (all working just fine), that there is more room for error than we give it credit for. I’m not saying “put anything in there you like, but you can clearly do a bad thing by having too long of a collar, but you can make up a lot if it’s too short by just coming up with a longer slave rod.
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Working on another engine the other day, assembling a new transmission to the engine, and I checked the throwout bearing collar tab height off the flywheel face to see how close it was to the 92mm ideal. Clutch was working fine when we took it apart. It was short by a good 10-12mm!!! Ok, so I go to the well as it were to look for a longer collar to get it closer to the ideal and low and behold, mother Hubbard’s cupboard is bare. Of longer collars at least. So what’s a guy to do? I’ve been dreaming of making adjustable length collars at some point so I never have to suffer this “no stock” indignity again, but haven’t quite gotten there yet, but I starred at the collar wondering how to make it longer. Cut it in half, machine and weld in a new ring of steel to lengthen it? Sure, I have all day to play that game, not…. Then an idea struck me. I wonder…..
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@EuroDat thanks for the additional clarity, helps to clear things up a bit. I definitely have 240mm setup with the original shorter collar, it measures 34mm from the face of the bearing to the top of the ears. I removed my pressure plate today and measured the height on the forks, it is approximately 47.5mm. I was right around 10mm short on the 92 mm measurement from the ears to the face of the flywheel with the current collar, it looks like the 75-83 Z/ZX Coupe Non-Turbo collar should match up and get me very close to the 92mm. -
Thanks for the help, I just rolled under the car to check, I do have the 240mm setup because it has 9 bolts holding the pressure plate on. Sounds like from what you guys said this is fine to run on my car? I do intend to check the 92mm measurement before bolting the transmission back on, something I did not check the first time around. I know for a fact that I have the shorter Type A throwout bearing collar, have a hunch I will need to order one of the taller ones to hit that measurement.
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The zcarsource description is wrong on the clutch kit, turbo and 2+2 are the same parts. Can't exclude one and include the other. Edit - actually I see that what they did is to just add irrelevant information and leave out other relevant info. It could be turbo, 2+2, or turbo 2+2. All 240mm. But you might have the right parts. The pictures match. Looks like the 240mm clutch setup. The parts that you said are on the car look like 240mm also. So, odds are you'll be fine. 92mm is the critical measurement. https://zcarsource.com/transmission-service-kit-240z-260z-280z-72-78-new/ https://zcarsource.com/clutch-kit-260z-280z-280zx-300zx-74-83-non-turbo-2-2-81-86-turbo-new/ https://zcarsource.com/flywheel-manual-transmission-260z-280z-280zx-74-83-2-2-and-turbo-new/
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Put "92mm" in the search box and a bunch of stuff will come up. There's a measurement that you can take before installing that works for most people with a 71B transmission.
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I can also vouch for that mod. It doesn't add any horsepower, but it certainly adds to the driving experience. I had mine reduced from 23lbs to around 16lbs. 4 speed or 5 speed doesn't make any difference what so ever. What is very important is pressure plate height and matching throw out bearing collar. If you can't get a kit with a matching collar, take your collar with bearing still fitted and check the height. Simply, with pressure plate on the counter or workbench, put the throw out bearing on top of the pressure plate and measure the height from the workbench to the collar tabs for the clutch fork. It should measure about 92mm. There seems to be the very odd excetion to this rule, but it is rare. If you don't get 92, you will need another collar.
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Sorry to hear you're having the same problem @Sailor Bob, but at least neither one of us is crazy (or we both are). I had to re-read the thread to remember, but it seems to me like the issue isn't actually the pressure plate or the collar, as I was getting the proper 92mm stackup. The problem seemed to be that that my pivot ball was too short. I'm not sure how it's possible, as @240dkw's pivot measures the same on the bench as mine but a few mm longer when installed. Some kind of local space-time distortion is the best I can figure (or measurement error on my part, whichever makes more sense). Adding an extra 4mm of washers under that pivot ball brought the distance from the tip of the ball to the front face of my bellhousing to 105mm (@240dkw's measured 103mm). The transmission is now installed and I've been driving the car every chance I get. The clutch feels perfect. I'm hopeful you can solve the mystery, but if you get tired I recommend just slapping two 2mm washers under that pivot and see if that fixes it for you.
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“Someone” totally has to design a variable length throwout bearing collar. Then buy any clutch you like and adjust the length of the collar to get the “rule of 92mm” total height. Enough of these struggles already.
