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73T clock stopped. Solution?

Posted: Tue Aug 02, 2022 12:58 pm
by 911hillclimber
Irritation #4 on my 73T.
The original clock, 2/73 911 641 701 00 VDO 0004 has never been good, starts, slows down and recently stopped.

It did advance 4 mins the last drive though after being dormant for ages.

Being bored, thought i would have a look at things. There is 12 volts to the clock, and the ground wire is to earth.
Clock out of the car on the bench, 12 volts on, grounded to test battery, nothing, no whirring, no hands movement.

Presume it is done for.
Tried half-hearted to remove the bezel and failed, really tight and dust proof.

Removed the 2 small nuts on the back and the white cover will not come free, but looks like it should?

So:
Any tips to get it into life?
Any tips to send it away to the UK for fixing? (Reep??) If so about how much?
Leave it in the dash as a piece of hole filling decoration.

Favoring the last option.

Re: 73T clock stopped. Solution?

Posted: Tue Aug 02, 2022 1:49 pm
by Lightweight_911
911hillclimber wrote: Tue Aug 02, 2022 12:58 pm
Leave it in the dash as a piece of hole filling decoration.

Favoring the last option.
That's what I'd do.

I can't really remember looking at the clock in any early 911 I've owned (or any other 'old' car I've owned come to that) - can't understand why Porsche still bothered fitting them in the '70's ...

.

Re: 73T clock stopped. Solution?

Posted: Tue Aug 02, 2022 1:59 pm
by Gary71
Fit a vent.
Absolute life saver :)

Re: 73T clock stopped. Solution?

Posted: Tue Aug 02, 2022 3:04 pm
by jb
Your solution is admirable in the hot weather but should you wish to fix it then john's thread is probably a good start if only to decide that it is too difficult.
viewtopic.php?p=237839&hilit=clock#p237839

Re: 73T clock stopped. Solution?

Posted: Tue Aug 02, 2022 3:14 pm
by 911hillclimber
Thanks JB, saw a similar video today but on a classic BMW, same clock (in general).
TBH can't be too bothered to fix it unless it was something easy, but some capacitors leak and loose their spec and the clock fails.

Will leave it alone as decoration and to remind me this is an old car with a grumpy old man trying to drive it.

It's just that it is there, right in my face, and not working, but after 34 years guess I can live with it.

Suffering from having nothing significant or hands-on to do!
Finished with old motorcycles now and even covered my new nuts-n-bolts over due to dust gathering on them, first time I've needed to do that in my life.

Gary, always drive with the window down a bit/lot so ventilation all good!

Re: 73T clock stopped. Solution?

Posted: Tue Aug 02, 2022 3:22 pm
by impmad2000
I removed the guts from my clock and fitted a quartz replacement movement like a kitchen clock. I wired the 12v feed via a high value resistor ( 10M ohms perhaps) and made no attempt to drop the voltage to 1.5V. I made the 911 hands fit and it just works and has done for years.

Re: 73T clock stopped. Solution?

Posted: Tue Aug 02, 2022 4:53 pm
by 911hillclimber
Good idea Tim, thank you, but I'll just leave it in there.
It is of little use as i isolate the car when not in use.

Re: 73T clock stopped. Solution?

Posted: Tue Aug 02, 2022 6:13 pm
by Nine One One
Or failing that, lift your wrist up, and look at your watch?

Re: 73T clock stopped. Solution?

Posted: Tue Aug 02, 2022 7:51 pm
by 911hillclimber
Very rarely wear one, never have.
Had some hard core safety stuff preached into me when an apprentice, lots of rotating machinery etc.
Don't have a wedding ring either...

Re: 73T clock stopped. Solution?

Posted: Tue Aug 02, 2022 8:46 pm
by MikeB
I have had two clocks that had stopped working, in both occasions I got the back off, pretty sure that involves getting the bezel off, and I went to the little set of points that resets the spring, and gave the contact faces a clean with some emery paper and Hey Presto they worked ;)

Re: 73T clock stopped. Solution?

Posted: Fri Aug 05, 2022 5:34 pm
by Dougieboy1
is it a quartz or pre-quartz.

My 72 is the pre quartz type and didnt work. After a bit of research, i discovered that the pre-quartz clocks, inside the workings in the back of the clock, have an electrical connection that behaves like a fuse and requires low temperature soldering to be repaired. Mine had broken so no power getting to the clock although power to the wire as with yours. I resoldered the connection and it worked for about 2 mins.

Am neither a clock person or patient, so i gave up and it is permanently 5.30. But as they say, at least it is correct twice a day.....

Re: 73T clock stopped. Solution?

Posted: Fri Aug 05, 2022 7:11 pm
by 911hillclimber
I got fancy, and have set the hands to 9-11, eleven past nine.
It will stay this way, the rest of the car is leaning to the state of the clock!

Re: 73T clock stopped. Solution?

Posted: Fri Aug 12, 2022 11:01 pm
by Dougieboy1
in watch circles, watches are often displayed at 10-10, i dont know why, maybe some of the watch experts can comment on that....

Re: 73T clock stopped. Solution?

Posted: Sat Aug 13, 2022 7:12 am
by 911hillclimber
Deemed to look 'happy' I think.
Drew Prichard has said so, must be right!

Re: 73T clock stopped. Solution?

Posted: Wed Aug 24, 2022 6:18 pm
by RobFrost

911hillclimber wrote:Suffering from having nothing significant or hands-on to do!
Have you considered rebuilding an engine?

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