So a small update on HS30 00150 clock.
What usually stops a 240z clock (apart from owners tampering with them trying to get them to work) is grease and grime that builds up on the clock motor gears. In an automotive environment there seems to be lots of dust which unfortunately is what seems to have killed my clocks.
You may recall that I decided to keep HS30 00150's clock original rather than replace the mechanism with a QUARTZ movement, I did this for posterity but also because I plan to run the Rally Clock most of the time and keep the original clock as a just in case...
I originally opened the clock for my 72 240z to have a sticky beak, but didn't see anything obvious. Well Ron showed me that under a microscope you can see a whole lot more. I figured I'd share them here for anyone who wants to attempt to fix their clock.
It only takes a very small amount of contaminants to stop the clock as you can see.
This is what he told me about the clock after cleaning it up.
I was a bit unsure about keeping it original internally as opposed to going QUARTZ movement, but now that he told me that I'm glad I kept it original. Out of all 4 clocks I had, this clock looked like the only 1 that hadn't been handled in a ham-fisted manner, in fact I don't think it had ever been removed from the dashboard until I got my grubby hands on it.
To fix your 240z clock (if you're game to try), try using isopropyl alcohol to clean the gear assembly and remove all traces of previous contaminants, Ron tells me he uses a marine grade grease/lubricant on certain areas of the clock assembly.