thanks for the video, it is very instrumental. I have same exact issue on my tachometer, burnt resistor. I replaced 56 ohm rate at 1/2 watt resistor and 100 microfarad / 10 V tank capacitor. It fixed the inoperable tachometer.
What is the value of the resistor that failed on the speedo? I'll guess it might be the same as the other next to it but I can't make out the color code. For the clock, replace the two electrolytic capacitors, this is the common failure on the clocks.
Hi, for the clock it is one of the elcos. I have repaired a clock on a W126. There are some German W126 sites that show which elco it is. A new clock is very expensive.
I found this on the web: You need 100mfd caps with a 20-40vdc rating. (RadioShack.com) I repaired mine the same way. Also you can desolder one of yours and take it to an electronics supply and get something similar. If you can solder at all, its an easy fix- if not, most speedo shops charge about $140.00 to fix your clock. The parts to DIY are less than $4.00.
How would you repair the tachometer on a 1987 300D w124, I had the same exact loose resistor that you had on your video. I replaced it but the tach still does not work. Could I modify a gasser tach to work, and how would you check it with out installing into the car for a test. Thanks for your great videos Joe
frako 100/10 (100 microfarad / 10 V) capacitor short out, and 12 Vdc in rush current burnt in series 56 ohm resistor. Replace both components shall fix the tachometer.
Just try to help people fully not just like partially.Why don't u describe how to check the supply u are just making this video even kids van understand.Try to explain what all connections are comming from where all places
The tach in my '91 300-SEL M103 engine does not work - it's a gas car. Not sure if my tach assy. is similar to the one in this video. My clock does work. Speedometer/odometer/trip meter are also not working. Most likely I'll send to Rick Borth in Austin Tx - speedometer.com
thanks for the video, it is very instrumental. I have same exact issue on my tachometer, burnt resistor. I replaced 56 ohm rate at 1/2 watt resistor and 100 microfarad / 10 V tank capacitor. It fixed the inoperable tachometer.
Thanks for sharing
Fix of the time clock is often replacing a burnt condensator 16V 100uF. 50ct piece.
What is the value of the resistor that failed on the speedo? I'll guess it might be the same as the other next to it but I can't make out the color code. For the clock, replace the two electrolytic capacitors, this is the common failure on the clocks.
The 300 TD wagon, does it have a special size tac relay?
Many tanks !! I have the same resistor burnt on tacho of my sl 380 . The resistor value ins the same 56 ohm?
Hi,
for the clock it is one of the elcos. I have repaired a clock on a W126.
There are some German W126 sites that show which elco it is. A new clock is very expensive.
w124250d1992 Thanks for sharing….
I have a 1990 300D and my tachometer works intermitently. Any ideas? Where does it get the signal?
Usually the clock does not work because the capacitors are dried out and need to be replaced. Easy fix.
nice, thanks for sharing....
Yes, i fixed my clock by replacing the capacitors. It was an easy $2.00 fix- speedo shops charge $145.00 for it. Now to figure out the tach...
Do you know the value of the capacitors?
I found this on the web: You need 100mfd caps with a 20-40vdc rating. (RadioShack.com) I repaired mine the same way. Also you can desolder one of yours and take it to an electronics supply and get something similar. If you can solder at all, its an easy fix- if not, most speedo shops charge about $140.00 to fix your clock. The parts to DIY are less than $4.00.
How would you repair the tachometer on a 1987 300D w124, I had the same exact loose resistor that you had on your video. I replaced it but the tach still does not work. Could I modify a gasser tach to work, and how would you check it with out installing into the car for a test. Thanks for your great videos
Joe
I don't know …sorry…try forum. good luck.
Buy one off eBay that's tested and works. They aren't that expensive.
Great Idea….
Replace the 100 microfarad / 10 V (frako 100/10) tank capacitor in series with resistor.
How do you repair the clock on w140?
thank you for the video it is very educational . can you specify the value of resistance
56 ohm and 1/4 watt
Similar problem. Did you get a working tach for this car? Can you advise me on testing the signal?
For repairs please call me at Father & Son Speedometer (714) 309-4611 I'm in southern California,,, PS I'm a 1984 300SD owner too :
frako 100/10 (100 microfarad / 10 V) capacitor short out, and 12 Vdc in rush current burnt in series 56 ohm resistor. Replace both components shall fix the tachometer.
Have YOu fixed it?
i have same problem, thanks for sharing this video :)
you are welcome….
hi,,i want to add RBM in my car disl why,,can you help me
In my case, the tachometer is not working but the clock is... will try to troubleshoot before ordering new part
Just try to help people fully not just like partially.Why don't u describe how to check the supply u are just making this video even kids van understand.Try to explain what all connections are comming from where all places
What if tachometer doesn't work
The tach in my '91 300-SEL M103 engine does not work - it's a gas car. Not sure if my tach assy. is similar to the one in this video. My clock does work. Speedometer/odometer/trip meter are also not working. Most likely I'll send to Rick Borth in Austin Tx - speedometer.com
Ok
MBCluster.com repairs them
I heard about them...
The 300 TD wagon, does it have a special size tac relay?