I tried a search, but the only failures of W126 odometers I could find involved broken gears. I have suspected my odometer is reading slow, and recently confirmed it; on a 180 mile trip the odometer only read 110 miles. I have fixed slipping W123 odometers using loc-tite before, will a similar repair work on the W126 odometer?

__________________
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

Same issue for my SDL but the opposite.
I just found on a longer trip that I travel about 9/10 mile for every mile shown on odometer. With all new gears too.
The error doesn't show until about 25 miles and does accumulate.
Maybe the encoder?
Maybe just the intrinsic error of an older mechanical odo.

__________________
1986 300SDL 201K Daily Driver
1984 300D In Progress
1989 240GL 196K Swedish Brick
1984 300SD -- Sold 289K
------------------------------

My 1983 300SD had a slipping then stopped odo.
The same Loc-Tite type fix worked.

And when I opened it I found the 12 tooth gear was missing two teeth.
I scavenged a replacement from an old Radio Control toy car.

I found the internals to be basically the same as the earlier W123 odo.

__________________
80 300D 340K Owned 30 yrs
83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day
02 Z71 Suburban 117,000
15 Toyota Prius 2600 miles
00 Harley Sportster 24k
09 Yamaha R6
03 Ninja 250

The non gluing method involves etching up the surface of the pin; Jimmy swears by an engraving tool, IIRC, but I just used a sharp knife. Don't pull the pin unless you have something to slide in on the other side. Otherwise, its nearly impossible to get everything lined up perfectly again.

__________________
1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!

Need Gears?

Attached Thumbnails

 

__________________
'84 300SD sold
124.128

Order your gears at carradio.com. Fast shipping and low prices.Replace all three.

__________________
1999 w140, quit voting to old, and to old to fight, a god damned veteran

The '87 has the same issue. I'm interested in your outcome.

My daily driven w126, "Coda" --- odometer broke. I removed the cluster and extracted the odometer. Guess what? It's NOT like a w123 odometer. It like has 2 parts and the main part is soldered to the board of the 2nd part. I didn't want to have to unsolder it to get to the mechanical parts. Yes, I had one obviously broken gear...broke right in half; and another gear missing about 1/4 .

I sent it off to www.speedometer.com ; Rick was friendly and quick with his service.

__________________
daw_two
Germantown, TN

Links:
Sold last car --- 05/2012 1984 300D Light Ivory, Red interior
Cluster Needles Paint
New Old Stock (NOS) parts

Past:
3/2008 1986 300SDL "Coda"
04/2010 1965 190D(c) "Ben"
& many more

I'm thinking the same thing..........

Cost??

I think it cost about $125 and the odometer came back with about 120+ miles on it in about 7 days.

Coda's speedometer worked fine; Rick only worked on the odometer. Replaced 3 gears, lubed it, and bench tested.

__________________
daw_two
Germantown, TN

Links:
Sold last car --- 05/2012 1984 300D Light Ivory, Red interior
Cluster Needles Paint
New Old Stock (NOS) parts

Past:
3/2008 1986 300SDL "Coda"
04/2010 1965 190D(c) "Ben"
& many more

Yep, that's reasonable........considering that half that cost is in parts (three gears). I'm going to give it a try as well.