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Originally Posted by zeke
Yup you are right - I want to pay someone to do this for me.
The question I have from both your great description and DieselGiant's is what you do with those plastic gears. If they are stripped or broken, can you buy new ones?
If I found a speedo/odo at a junkyard that was properly geared could I just swap it out of the cluster? That seems easier that a rebuild, but then I still would need to change the mileage - would that end up costing me the same as having my existing one rebuilt?
I am weiging my options, but I am now pretty convinced that I don't want to disassemble the odometer myself!
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Yeah. Those gears are out there. I've found at least one source for them. I lucked out, and had good gears in the 300D speedometer, so I didn't order any. I can't think of the website off the top of my head.
Completely stripping the speedometer down isn't really hard, but it does take a while. Subtract the time I spent on re-doing my work after dropping one, and it took me about three hours to clean and repair one. Add more time and frustration if calibration is needed when you're finished. I'm very mechanically inclined, but I'd say anyone with moderate mechanical skills and a couple of basic tools could handle the job. I'm pretty sure we all have a set of specialty spoons laying around, too.
As for just swapping out a spedometer goes, just find one that'll bolt in, and make sure the gear ratio is correct, and you'll be good to go. That is assuming you find not only the correct unit, but also one that is functioning properly. The speedometer portion is pretty robust, but the odometer part does seem prone to a couple of common failure points based on my research and limited experience with them.