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#1
06-11-2002, 01:44 AM
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VDO Clock, '75 240D w115
One more time guys...
I pulled the instrument cluster to fix a loose bezel and while I was in there I figured what the heck I might as well fix the clock since my wife hates not knowing what time it is...  She's been threatening to put in a digital stick on clock! NOT in my little car!Well after doing a search here, I pulled the clock apart (getting the bezekl off is a lot of fun) and managed to find a loose gear that had broken the pin that held it in place. I took a push pin, heated it red hot and stuck it into the guide hole and as I had hoped it melted the plastic shaft now holds in place fixing the gear. Only probelm is that when I put it back together and put 12 volts to the clock, the motor has ceased to function, it did work before, I promise. All that work for naught. Anyone have any ideas what I did to kill the motor? It has twelve volts getting to the positive pin but the negative pin is dead indicating that maybe I blew the motor? Probably a 15 cent part that will cost 20.00 to install on a bench. Oh well. BTW- TXBill, I did take pictures of the whole procedure of taking the instruments apart for your DIY page...If you want them? 
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#2
06-11-2002, 09:19 AM
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My 84 300SD clock also did not work. Even the motor would not turn. I heavily oiled the shafts. It has been about 4 months since I oiled it, and the clock still keeps perfect time.
The only problem is that face of the clock got soaked in oil.
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#3
06-11-2002, 11:25 AM
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Nothing you described could have killed the motor. Maybe you just knocked a wire somewhere or have a gear jammed? I'd take it back apart and give it a good once-over and lube it up while it is open.... What's the worse that can happen, the clock not work?
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#4
06-11-2002, 12:53 PM
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Good point!
I pulled it all apart and lo and behold it appears that I broke the pcb when disassembling. I fixed the cracked circuits but still no go. I annot get a reading across the motor connectors so I think the motor must have died...  Anyone got a working version for a 75 240D panel? I think the plan now is to just put it all back together and maybe it will fix itself.  Our local electronics guys won't even touch it so that's the best plan I can think of at the moment. When pulling these apart pay attention to all the soldered connections before pulling the board loose. That was my mistake!
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#6
06-11-2002, 07:48 PM
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Check the resistance across the motor. This will tell you straight away if the motor itself is fried.
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#7
06-11-2002, 09:01 PM
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No reading, so I suspect it is dead.
I put it back into the car today stuck on noon. I re-soldered all the connections and tested them prior to putting it back together. I think it may have been running for so long that once I stopped it, it just doesn't have anything left to restart.
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