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Have you heard of @zclocks on this site. He’s pretty much the expert on these clocks. I’d reach out to him and see if he will take it on.

Cleaning out my shed of Z items. Free to the first person to pick up in Johnson Lane, NV (Reno/Tahoe area). Set of 4 Epsilon 3 piece wheels with black centers. Wheels were setup in 1982 by Mark Morris Tires in Portland, OR for a 1981 280ZX. I've also run these on 3 different 240Zs over the years. The mounted tires are too old to use and will need to be discarded. The wheels have blemishes expected after over 30 years of use. They still clean up good enough to use as is or restore. NOS Ansa resonator (rear muffler) for a 240Z. This muffler mounts horizontally (dual outlet), not vertically. These were popular on 240Zs during the 1970s. EDIT: Added photo of the wheels on my last 240Z.

The non working clocks capacitor I removed measures 111uF, so that was probably still good. The working clock that loses time capacitor starts off at 0, then takes a minute or 2 and only climbs to .8uF, then goes up and down from .8 to .6, so maybe the new capacitor will fix this one. I cleaned all the gears, resoldered all the connections and replaced the cap so maybe I'll get lucky. I'll let it run a couple days to see. Yesterday it lost 10 min in 24 hours, a few days before about 6 min in 24 hours, and a few days before that 45 min in 12 hours. In between all this it held perfect time in 24 hour periods. Its very random when it works or doesn't. I looked everywhere trying to find a 12v quartz movement or buy another clock to gut that could be retrofitted into this, but for the cost, it would probably be better just to send it to instrument services, they said they charge $200 to rebuild them.

Save the date if in the area or interested in a road trip...ECZN is an easy three day event wrapped in the Carlisle Import and Performance Nationals in Carlisle, PA. Get those Zs ready for Carlisle East Coast Z Nationals (ECZN), which is held internal to Carlisle Import & Performance Nationals. Save the date if in the area or interested in a road trip. ECZN is an easy three day event wrapped in the Carlisle Import Nationals inside Carlisle, PA Fairgrounds. Over 18,000 attend the import nationals and the Maryland Z Club hosts ECZN social evening and drive on Friday... Then enjoy Saturday festivities at Carlisle fairgrounds. Nissan/Infiniti paddock for ECZN attendees with car show awards, raffles, special display vehicles and more. Thursday Evening May 15 – Happy Hour Hotel Bar – Homewood Suites by Hilton Carlisle Friday May 16 – Hang out at ECZN Tent / Fairgrounds / Corn Hole Z Cruise around Carlisle – Planned Route End at Desperate Times Brewery at approx. 5:30 pm Social time at Desperate Times: 5:30pm – til ?? Other bars downtown Carlisle — on your own Saturday May 17 – Carlisle Fairgrounds for ECZN People’s Choice Car Show Registration from 8am to 10am Voting 10am – Noon 12 noon ballots turn in Awards Raffles 50/50 3pm Register for Import and Performance Nationals select club East Coast Z Nationals and then register for ECZN, its only $10. Website and registration: www.eastcoastznationals.org #eastcoastznationals #Nissan #Nismo #zcca #zclublife #marylandzclub #whiterosezclub #datsun #ZCCR #s30 #s130 #z31 #z32 #z33 #z34 #rz34

Yeah, that thread popped up when I was poking around as well. >> https://www.zcar.com/threads/280z-clock-part.354058/ Yeah, unfortunately, it's sounding like it might be the chip or the crystal. I could probably tell you which of those two items are not working, but it would take an oscilloscope.

Excellent. Send pics when you get a chance!

This is a little bit wide of the mark, but how about this Z on an album cover...

My brother likes making them, and i am not from the U.S. but thank you for this site! It is going to be handy i reckon.

Call “Junkyard Jenny”. Pretty sure She has one. Will save you a lot of time.

Yeah my brother is very good with making a new one, so i think with heatshield i do that. Thanks alot for helping, i will send you a picture when its in. (It will take a while) Thanks alot for helping!

I found on another forum where someone posted this in 2014 where they called ToyoCom, which I think is now Epson about the crystal: Thanks a lot, I gave them a call and they only sell in bulk, $300 minimum order. Wouldn't answer any questions. https://www.4starelectronics.com/mfgs/Toyo-Distributors.html This was the website he said he called. I was hoping there would be a source for some old stock somewhere to rebuild these, because I like having an accurate clock and like the look of the stock clock. This clock I took apart doesn't appear to ever had lube anywhere, unless it totally evaporated and disappeared, so I'm not sure if these clocks used any lube from the factory. I tried running it with all the gears off except for the 1 drive gear, and that doesn't turn. I don't believe the coil could fail without it being noticeable.

Gotcha. Was just making sure the readings you were seeing were "first order" and you you weren't reading something that was fooling your AFM gauge. Something like a lean misfire that can read rich. That sort of thing.

I see sites like that all the time claiming that they have stock of old obsolete electronics. I've never actually tried to order from any of them, but I'm skeptical as to the legitimacy of them. Might be completely legit, might be a complete scam. And that's an interesting thought about the programability of the 44001. I guess there is a possibility it's a programmable part. And if so, there's the follow-up question of "when you buy it, is it already programmed?". The 4V drop across the resistor is good. It should be "battery voltage - zener voltage" across the resistor. So if battery is 12 and zener is 7.5, you should see 4.5V across the resistor. if you've got that correct drop across the resistor and the clock doesn't run, then it's either mechanical or one of the remaining components (Xtal or control chip). Your other clock that sometimes holds time and sometimes doesn't sounds more mechanical than electrical. Maybe old lube has turned to tar and is gumming up the works?

When I rebuilt that old slave cylinder, I included an internal spring. So now I have both internal and external. It gives me guilty pleasure thinking that the two of them are battling it out on my car right now! Hahaha!! 😄

You need to fit one of the older heat shields from the round tops so you can use the return springs. And depending on what the climate is where you are located, the water through the carbs isn't a big deal. Good luck with the project!

Good thought. I do. I will have a look at it to compare.

Do you have a Nissan factory transmission mount to try? Maybe you're fcoused on the wrong member. The T3 mount is the only "non-factory" part.

Oops, missed that question. Yes, when I pull the choke lever a bit, the AFRs change - the numbers come down.

I bought one of these Magnetic Bore Laser Sight to help with alignment of the transmission to the differential. Still pondering on the options for how best to solve my issue.

https://www.worldwayelec.com/pro/cs-elec/hd44001/4250271 https://www.1sourcecomponents.com/availability/HITACHI--HD44001.htm https://fr.excesschip.com/product/details/hd44001 https://de.excesschip.com/product/details/hd44001 These are the only things I was able to find online for the 44001. Not affiliated with any of these, so click on them at your own risk. The top place shows they have some with a minimum order of 100, but not sure how accurate that is. I couldnt find a datasheet on these, so not sure if they would need to be programmed or not.

ZCarDepot has been good at sourcing parts. He shows a pickup coil for a ZX. The other parts are hard to find though. I've seen the bushings for sale in the past but not recently. Might be simpler to put in a 240Z distributor with a Pertronix conversion. Or a 280Z with an HEI module. Z Car Depot IncSearch: 38 results found for "distributor"New, used, and OEM repair and replacement parts for Datsun 240Z, 260Z, 280Z, 280ZX, and 510.

I found an old thread with several of us iin it. I feel kind of dickish reading my old comments. Hopefully I've mellowed. The 6801 has come up before, I'd forgotten about it. I also pulled up the 79 and 83 EFI ECU wiring diagrams and they seem essentially the same. Odd though that the 79 diagram doesn't show the O2 sensor circuit to the ECU. Just interesting that they apparently added the microprocessor to what had been a processor-free system. 1979 Uploading Attachment... 1983 Uploading Attachment...

Thanks much guys. That certainly explains why there isn’t an internal spring. I kept seeing the later version, and was pretty sure I didn’t loose it.

I'm fairly certain the problem is either the crystal or the HD44001. I have voltage everywhere, get about a 4 volt drop across the resistor, and the little gear still doesn't spin. This was my spare clock I had pulled out of a junkyard years ago. The one in my car sometimes holds time, sometimes loses lots of time, depending on how it feels. I was hoping to try to see if these were possible to rebuild, and then just swap the clocks and do the same to the other after. I think its a metal resistor, but not 100% certain on that.

Sorry meant to quote the air gap, link is the refurb it seems so I reckon I'll read threw it and try a repair