Pagoda SL Group

W113 Pagoda SL Group => W11x chassis cars => Topic started by: gcw206 on July 26, 2023, 21:00:32

Title: Speedometer flutters below 10MPH
Post by: gcw206 on July 26, 2023, 21:00:32

1969 280SE W111 Coupe, with an automatic transmission.
My OE speedometer fluttered an acceptable amount below 10MPH.
Then I damaged the OE cable while assembling the dash.
The OE cable was replaced with a non OE cable.
Then it skipped a lot, and the new after market cable was replaced with another by the same vendor.
All worked pretty well for a while.
Now my speedometer flutters a lot below 10MPH.  (Got worse over past year or so.)
It is either the gears in the automatic transmission; the cable; or the head unit in the dash.
I have found an OE MBZ NOS cable, but am I looking in the right place?
Thanks, Galen

Title: Re: Speedometer flutters below 10MPH
Post by: kampala on July 31, 2023, 01:27:11

There is a lot written about this issue on this site.  Try the search “bouncing speedo”

Or similar terms to bouncing.  You should find a lot of info. 

Title: Re: Speedometer flutters below 10MPH
Post by: ja17 on August 01, 2023, 04:52:18

Try loosening it up a bit at one or the other end.

Title: Re: Speedometer flutters below 10MPH
Post by: gcw206 on August 10, 2023, 18:37:26

I removed the speedometer head and cable;
Took to bench, hooked up cable to a variable speed drill;
Speedometer still jumped at low speeds;
Decided that transmission sending unit was not the issue;
I bought a NOS MBZ OE speedometer cable;
Installed, and problem solved.