I recently bought a speedometer unit for my '84 300SD. Installed it this morning. Speed works but no mileage. Took it out and saw 2 gears were broken. The little one and the outside large black one.

http://s25.photobucket.com/albums/c82/RedRyan66/?action=view&current=Presvisit1032.jpg" target="_blank">http://i25.photobucket.com/albums/c82/RedRyan66/Presvisit1032.jpg" border="0" alt="Photobucket">

I was tempted to use gears from my current speedo, but was afraid of breaking small gear. Tried cleaning big gear for part number, and it crumbled. Here's a photo of the one currently in the car.
http://s25.photobucket.com/albums/c82/RedRyan66/?action=view&current=Presvisit105.jpg" target="_blank">http://i25.photobucket.com/albums/c82/RedRyan66/Presvisit105.jpg" border="0" alt="Photobucket">

Anybody know where to get replacement gears?

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1984 MB 300SD Turbo

Try here. http://www.odometergears.com/mercedes.html

They should have what you need.

I'm having problems too but nothing is broken.

That setup looks similar to my old Volvo 850. That is pretty easy to work on.

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AJ

1985 300D (SOLD)

I've had the same problem the last few weeks. You might be able to find those gears at the junkyard in any w126 or in some BMW's but it is very difficult to get the small gear off the shaft without breaking it.

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"spreading a trail of obnoxious where ever we go"
1981 300sd w/ 341,500 miles

http://www.wecrash.com/pics/ddda_banner.gif

I have pulled many an SD speedo/odo to look for those gears. Most are already broken, and the ones that aren't usually disintegrate upon removal, especially the small one.
I bought my gears form the folks linked above. You need to get all 3 as they are very soft. I believe it was about $75 bucks with shipping. That is just how much it costs. You also need to count the teeth.
Believe it or not, mine were for my '81 wagon, W123 chassis. A one year/one model only application to W123's......

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

www.carradio.com is cheaper and fast.

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

Great information. Thanks all.
One thing. The small gear fell apart, leaving a brass sleeve on the shaft. Must this be removed ( how ) or does the new gear get glued onto it?
I took speedo #2 apart to count teeth.

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1984 MB 300SD Turbo

You must remove the sleeve.

Here is a little tutorial:

http://www.odometergears.com/subpages/List_of_common_solutions.html

__________________
AJ

1985 300D (SOLD)