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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 07-09-2006, 10:58 AM   #1 (permalink)
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stupid odometer

everything has been great on my 1990 325iX. Its been running great. And now, out of the blue, the odometer stopped working. no trip odometer either. any thoughts? where do i start. any help is appreciated. thanks
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Old 07-09-2006, 11:47 AM   #2 (permalink)
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You're gonna have to get a new car...

Just kidding.

You can start by checking the connectors on the back of the cluster. Also you can check the speed sensor on the back of your differential to make sure its still alive.
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Old 07-10-2006, 08:20 PM   #3 (permalink)
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Are you saying that the mph and odo each have a connection on the diff. so one can come loose and not affect the other?
My ODO does not work either, all other gauges work fine.
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Old 08-27-2006, 07:31 PM   #4 (permalink)
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99% its the plastic gears within the unit itself. take out the cluster, unscrew the back to get to the odometer, the gears are plastic and break over time,
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Old 08-27-2006, 08:50 PM   #5 (permalink)
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Actually, it's more like 99.9% of the time. The grease they put on the rubber like gears dissolves them over time.
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Old 01-11-2007, 01:34 PM   #6 (permalink)
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Removing and Replacing

I've removed the odometer and ordered the new gears. The question is - how to remove and replace the gears without damaging the odometer. Do the gears just slide off and on? Is there an index on the shaft that the gear has to match? The smallest gear has what looks like a brass center. Does that gear just pull off? Any guidance will be great.

I really appreciate you experts helping us poor souls out. Paying BMW megabucks to replace the entire unit is just unacceptable. :=)
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Old 01-11-2007, 08:04 PM   #7 (permalink)
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The brass pice needs to be pressed off (pain in the a$$) or if you are careful enough, use a dremel and buzz it off (works great, just don't slip) I don't know of you have the direct replacements, or the plastic push on ones (if you can get them any more)

I have rebuilt several so being that this is your first time, buy a spare and practice taking it apart and take your time, because the clear plastic doesn't take very well to force. If you want one let me know I have a few bad ones you can practice on.
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Old 01-12-2007, 12:18 PM   #8 (permalink)
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Originally Posted by Starmavin
The brass pice needs to be pressed off (pain in the a$$) or if you are careful enough, use a dremel and buzz it off (works great, just don't slip) I don't know of you have the direct replacements, or the plastic push on ones (if you can get them any more)

I have rebuilt several so being that this is your first time, buy a spare and practice taking it apart and take your time, because the clear plastic doesn't take very well to force. If you want one let me know I have a few bad ones you can practice on.
Thanks for the info. I purchased the gears from Odometer Gear Replacement

I read somewhere else that you can 'cut' off the small gear with the brass insert using a pair of side cutters. I'll approach it with caution. I may contact you for a practice piece. Thanks for the offer.
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Old 01-21-2007, 02:08 PM   #9 (permalink)
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Thanks for the info. I purchased the gears from Odometer Gear Replacement

I read somewhere else that you can 'cut' off the small gear with the brass insert using a pair of side cutters. I'll approach it with caution. I may contact you for a practice piece. Thanks for the offer.
Success! I used a pair of side cutters to get the brass insert off. It's brittle so when you clamp down it just splits off. Put all the gears back together and it works fine.

I'm German so I should understand but it seems like that's a lot of gearing to turn one shaft. used: That seems more English to me.
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Old 02-02-2007, 12:06 AM   #10 (permalink)
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What number gears to get?

Red I gotta do the same thing to my project car ('90 325i). What number gears did you get? There's a couple of different sets to choose from. Thanks.




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