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  #16  
Old 12-07-2014, 08:36 PM
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Thank you for the tutorial, from the photos below my sender certainly needed to be cleaned.

I did discover the copper wire had come off, presumably from the crud build up (was loose when I removed the aluminum casing). My question is where does this connect to. I'm unable to tell from the picture.

Thank you!





Good chunk of gunk at the bottom there.




Cleaned Tube
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1979-Oct Mercedes-Benz 300SD Turbo Diesel


450SEL 1980 150k parts for sale


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  #17  
Old 12-08-2014, 01:51 AM
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Impressive! I've never seen one that bad. Tomorrow I'll post some close-up pictures so you can see where the wire connects (it's already too late tonight).

Jeremy
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Our all-biodiesel family
1995 E300D (W124) . .239,000 miles My car
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  #18  
Old 12-08-2014, 01:58 AM
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46 gauge Resistance Nichrome Wire is very readily available on fleabay.

Its cheep too, 100 for $6
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  #19  
Old 12-08-2014, 11:35 AM
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Surprisingly when I shone a light into the tank, there was very minute specs of dirt/debris. Come summer time the strainer will be pulled and cleaned.

It's the copper wire that broke off, that Nichrome Wire is some strong stuff. I was probably much rougher with handling the unit than I should have, but its like a guitar string.
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  #20  
Old 12-08-2014, 12:31 PM
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Get some LA Totally Awesome cleaner, make a solution with 80% water and soak it overnight. Use a small acid brush on it every hour. It will be spotless afterwards. After it's clean , you'll be able to see where the broken solder joint is. If you project a line straight down from where the wire is still attached, you'll also find where it broke.

I have had broken nichrome wires (at the solder joint) where it's too short to be soldered back on. By splicing/soldering a short pigtail strand of copper wire to the nichrome, I was able to fix and save the sender .
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  #21  
Old 12-08-2014, 01:10 PM
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Sender pictures

Assault, you didn't identify your car but the sender is different—mine doesn't have a third wire. It uses the center support rod as the third wire. Thus, I can't tell you where that loose wire goes.

The following pictures are from a W124 E-class car. I keep this sender as a spare, it's probably from an early '90s gasser.

Jeremy


]








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"Buster" in the '95

Our all-biodiesel family
1995 E300D (W124) . .239,000 miles My car
1996 E300D (W210) . .313,000 miles Wife's car
Santa Rosa population 170,685 (2012)
Total. . . . . . . . . . . . 722,685
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #22  
Old 12-08-2014, 01:16 PM
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W123 senders are different physically and electrically. The W123 sender nichrome wire resistance is 57 ohms measured at the connector, not 90, I believe that figure is also stated in the FSM.
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  #23  
Old 12-08-2014, 01:30 PM
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1980 300SD W116

Thanks for the pictures, hopefully someone knows where it goes on the w116.
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  #24  
Old 05-16-2016, 02:19 AM
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BUMP

Quote:
Originally Posted by Jeremy5848 View Post
I'm reviving an old thread to ask a question about this pic. Is the 300D sender longer than the 300E sender? It looks like it in this pic but maybe it's just the camera angle playing a trick.

I picked up a 90L tank out of a 95 E300 to swap into my 87 300D and I need to decide whether to try and fix my bouncy 70L sender and swap it into the 90L tank, use the sender that came with the 90L tank or buy a gasser sender to swap in. The 90L sender that came with the tank has exactly the same cracks as the one pictured in this thread.

Last edited by tjts1; 05-16-2016 at 02:54 AM.
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  #25  
Old 01-26-2017, 03:34 PM
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Excellent write up and contributions by everyone - if anyone is interested in submitting a DIY Tech Article and becoming one of our DIY Project Experts, check out the link below. If we publish your article, we'll give you 10% off your next order!

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  #26  
Old 01-27-2017, 10:58 PM
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Quote:
Originally Posted by tjts1 View Post
I'm reviving an old thread to ask a question about this pic. Is the 300D sender longer than the 300E sender? It looks like it in this pic but maybe it's just the camera angle playing a trick.
The two senders are identical. I used the camera angle to minimize reflections.

Jeremy
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"Buster" in the '95

Our all-biodiesel family
1995 E300D (W124) . .239,000 miles My car
1996 E300D (W210) . .313,000 miles Wife's car
Santa Rosa population 170,685 (2012)
Total. . . . . . . . . . . . 722,685
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #27  
Old 06-13-2018, 04:28 PM
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Thanks for the detailed thread Jeremy, v helpful.

Mine of S124 300TD





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1998 Mercedes W210 300TD - 118k (assimilated into above vehicle)
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