I drive a '84 300sd.

I replaced the ODO (all 3) gears earlier today. ODO and tach still not working! when I manuely turn the gears it works! however when I install it, nothing! what gives? this is my 1st time doing this as well.
also I used the link below as a guide:

http://www.dieselgiant.com/repairyourodometer.htm

conincidently, I didnt use any "thread locker" either, all my gears are plastic.


what else can I try?


thanks in advance,

Enrique

Check connections and fuses.When I pulled my dash it always blows a fuse.So now I disconnect battery. Now Tach issues could be like mine.Unscrew round amp under the hood.Make small bits of tin foil to go in socket holes.Screw back on,the pins should make a tighter contact.
carradio.com is where I get my gears,they rebuild speedo odo too.My parents live in S.A. too.

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

many thanks, unplugged and reconnected everything tach is now working. ODO and trip still out! any thoughts? should the gears slip in and out of the spindle easily? their not loose by any means but I can pull them out with a little push...

Enrique, I haven't done this job so may not be much help. See if there is something in this link that might answer your question:http://www.odometergears.com/VDO_MotoMeter_Gear_Replacement.html

If you bought your gears from them, they may be able to answer your question.

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Sam

84 300SD 350K+ miles ( Blue Belle )

Samba, I just did this procedure a few weeks ago on my 240. I followed that dieselgiant guide and it all worked out for me. When you have your speedo out and the headset removed, turn the brass gear by hand UNTIL the trip counts to at least 100 miles. This will test that the metal gear is not slipping on the shaft when its having to turn the heavy loads. Also, when putting the shaft back through the odo numbers, be sure that it is really in there. If it is out too much the plastic/nylon screw type gear will not turn it. Be sure to visually inspect those plastic gears to make sure they are in contact with each other and that they aren't cracked or broken.

Next time be sure to name the problem you're having in the thread topic. Something like "HELP!" is less likely to get many views or responses and the admins may yell at you.

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1981 300CD 260k w 60k on new motor
1983 240D 4spd Manual

Check and make sure no plastic gear teeth jammed the odo some where.I used loctite (very small amount) on plastic gears.You may have to send Odo in.

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

Is the speedometer working?

I had a issue on my 300SD where the trip lever jammed and stopped the odometer from turning. When you reassemble the speedometer did you check that the trip lever functioned properly?

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"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy"

Current
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Note of caution: the W126 and W123 are different. IIRC, the DieselGiant website has info for the W123. The W126 is electrical impulse and the W123 is cable driven.

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Sam

84 300SD 350K+ miles ( Blue Belle )

thanks for alll the replys guy, im working right now but I will give it a go this evening...I'll let 'yal' know


regards,
Enrique

alright the trip meter resets fine and I rolled 20miles or so on the ODO.still nothing.

The only thing I havent tried is some loctite on the gears... also, I dont know if I screwed something when I broke off the brass gear (?) if so how would I know and how can I repair that?

many thanks guys...

enrique

It sounds as if the motor or electronic chip may have a problem. Here is someone more local: http://www.speedometer.com/index.html

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Sam

84 300SD 350K+ miles ( Blue Belle )

thanks Sam