Zed Head

I'd go with Pennzoil Synchromesh or Redline MT-90. They're both better than typical manual transmission fluid. Redline has been proven in many situations, solving grinding problems. Search on the forum and you'll find stories. If you use Driven you might be the first. https://drivenracingoil.com/i-30497794-go-80w-90-conventional-gl-4-gear-oil.html https://www.redlineoil.com/mt-90-75w90-gl-4-gear-oil https://www.pennzoil.com/en_us/products/other-oils-fluids-fuel/manual-transmission-fluids-axle-oils/synchromesh-manual-transmission-fluid.html

They all get 1/2 of their needs every three sparks.

But, just for fun, it also suggests that the monkey motion transmission was used up through 1976. Lots of confusion out there. https://www.carpartsmanual.com/datsun/Z-1969-1978/power-train/transmission-assembly

The parts schematic suggests that there are really only three possible sleeves, and four or five pressure plates. The Exedy with the long sleeve sounds like the right combo. https://www.carpartsmanual.com/datsun/Z-1969-1978/power-train/clutch

How do you know? The 240Z came with a Type B 4 speed after the Type A monkey motion unit. Feels like the table has turned... For what it's worth, more food for thought, the Type B 5 speed is identical in every way, externally and gears 1 - 4, to the Type B 4 speed. Nissan just added a 5th gear and some shift control mechanisms. The 1 - 4 ratios are identical. In 1978 you could order a 5 speed or a 4 speed. It would be a Type B transmission. Same dimensions. Pretty sure the clutches were identical. Just poiniting out that the labels in that figure don't really tell much.

Odds are good that the sleeve/collar is the one that came with the car. So the typical 280Z 225 mm pressure plate will probably work correctly. Worst case, you take the measurement after you get it and have to wait to get a new sleeve. Your biggest mistake would be installing without taking that measurement. That's where all of the "what's wrong" threads come from. So, at this point you're really just choosing between a "guaranteed" correct fit or maybe having to wait for a new sleeve. Certainty or uncertainty.

Which of these is 240Z and which is 280Z?

https://en.wikipedia.org/wiki/FR-2 Looks like good stuff. Probably easy to work with. Must be an analog here in the states somewhere. https://gie-tec.de/product/phenolic-resin-paper-laminate-fr2/?lang=en Phenolic resin paper Laminate FR2 Halogen-free laminates (1,5mm) out of phenolic resin paper High dielectric strength, excellent insulator in high-voltage technology Very good processing, high tool life 35µm copper cladding (copper foil, single side) Optionally uncoated or with foto positive coating of the copper foil High quality positive resist with short process times Produces according: – UL: E103670 – VDE: Reg. Nr. 4158 – BSI: 6741 Option: Phenolic resin paper/ Pertinax without copper lamination, Thickness 1,0mm or 2,0mm

https://en.wikipedia.org/wiki/Pertinax

Here's a trick that might tell you something. Connect a light or a buzzer between the starter solenoid wire and the solenoid terminal. When you turn the key to start the starter should work and the light should light or the buzzer buzz. If you turn the key to Start and you get a light or buzz but the plunger doesn't plunge it's a mechanical problem. If you turn the key to Start but there is no light or buzz then it's a heat-induced open electrical circuit. No current flow through the solenoid windings. The ground for the light or buzzer is on the other end of the windings.

I think that the Perfection kit I got might have been on the shelf for a while at the local auto parts store. Bought it in 2009. It was actually Zoom by Perfection if I recall right. Odds are it will work fine. Mine only had problems when it got hot. I got on to Summit and found this. Doesn't say Perfection in the title but does in the video. Who knows. They're probably all made at the same place. https://www.summitracing.com/parts/zzz-mu47594-1a/make/nissan/model/280z/year/1976

Or, if everything goes dead when you turn the key, it could be a dirty battery terminal.

Then what I wrote applies pretty well. It will be hard to determine is the solenod has an open circuit when it gets hot or if it's sticking. You might try tapping/beating on it when it happens. You said it has voltage. Is your probe on the male terminal itself or on the female wire end when you measure? The female ends get loose and lose contct. Maybe it just needs a good squeeze. .. . .

If you watch the video in his first post you'll see that it's not a typical throwout bearing. In your picture you can see the gap between the part that spins and the part that doesn't. In his you can't see that gap on the back side, it's solid. But the gap is there on the contact side, with the narrow contact surface. And he shows that the bearing spins correctly on the sleeve. It's just an odd bearing. OR maybe it has fallen apart and the actual contact surface is missing. Just thought of that. Maybe it's a broke bearing, installed correctly. This is my new working theory. More broken stuff, to fit with the missing flywheel pins. Notice that the surface you're showing is rounded while his is not. Deosn't really matter much becuase he already said he's getting all new stuff. Just a puzzle.

The solenoid plunger can get stuck in the cylinder. All that is causing it to move is the magnetic field created by the solenoid coil. Take it off and see if something is misaligned. Could also be an open circuit somewhere. Are you saying that you don't even hear a click when you turn the key? Check the mounting bolts for the solenoid. Grab the solenoid and see if it's loose.

The one-six and the Godzilla are similar but not identical. The Godzilla has two wheels, a 24-1 and a single tooth. The one-six apparently only has the 24-1 wheel. And the one-six is a Hall effect, the GRW is VR. You'd need to know what your engine management system can do and what you want it to do to make the right choice.

Edit - my mistake. The Godzilla guy needs to up his advertising game. Those pictures are bad and not everybody will want Barney on their engine.

Just for context, here's an image of the board. If you're thinking mass production then something easily machinable would be good. For one time, you might dull some tools cutting a glass-reinforced material. Stole it from here...

I haven't thought about the aftermarket stuff for a while but I know that on my 2003 Ford engine, the old distributor shaft remnant is used to indicate compression stroke of #1 to the PCM (computer) for sequential injection. That's all it does, it's not involved in precise timing at all. Ford basically cut the top off of a distributor and replaced it with a half moon trigger and a camshaft position sensor. The engine has a crank shaft trigger wheel for ignition timing. And it uses wasted spark. Wasted spark just sends spark to cylinders that are on either exhaust or compression strokes. Doesn't matter, the cylinder that needs it will get it. The other one won't even know. DIYAutotune has a bunch of tech articles and parts. Worth browsing. https://www.diyautotune.com/support/tech/ https://www.diyautotune.com/?s=nissan Ford stuff below. To think about. You can find a bunch on Hybridz and probably DIYAutotune about Ford's EDIS ignition. That's a common wasted spark system that people swap over to.

Flywheel too. https://www.summitracing.com/parts/pio-fw-151/make/nissan/model/280z#overview

Contact with the sleeve is in the center of the bearing. The center contact area will be the same even flipped. Only 240mm flywheels are available. It's been that way for a long time. You'll still be wondering about sleeve/collar height. Might be worthwhile to look around for a complete kit. Rockauto might not have all of the possibilities. Here's a good one. I've noticed that Summit seems to be upping their game. Shows the sleeve as part of the package. Luk is a pretty good brand. https://www.summitracing.com/parts/luk-06-031?seid=srese1&gclid=CjwKCAiAq4KuBhA6EiwArMAw1A_fRkHgUpSEptzfiK9DwA4Dle70u3LwI0evTrz_vA_Prnej23vdxxoCTYAQAvD_BwE#overview

I'd guess the flywheel is fine. Get the locating dowels (if they're not broken off) and tap them in. They're important. I had a Perfection clutch and it chattered and had high pedal pressure. Did not like it. But it looks like it's the only one that comes with the sleeve, on Rockauto. Looks like your travails might just be starting. You can buy the sleeves separately but without a measurement you don't know which one you need. You could probably just replace the disc with an organic one and might be fine. Or just throw it all together and hope. Choices!

p.s. I only see one locating pin on the flywheel. To locate/center the pressure plate. Am I missing some? There should be three, I believe.

Run your fingernail over the transition from the machining marks to the smooth wear surface. See if there's a ridge. The flywheel has seen some use. You can also put a straightedge on the surface and shine a light fror the other side to see if there's wear. A machine shop could regrind it for less than a new flywheel. Might be worth doing if it's a 225mm. One downside to the 240mm is it's heavier. Makes the engine slow to respond. Some guys like the lightweight flywheels, they make the engine peppier. At least you know more about what you have now. Might have avoided some aggravation. Don't forget to check your pilot bushing in the end of the crankshaft. Might as well replace it, they're cheap and it's easy to do.

I don't see yours on their site but there are examples of others. https://allclutchsystem.com/shop/ols/categories/nissan?page=1&sortOption=ascend_by_price