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Just finished this repair myself. To answer last post, yes, that one gear will likely be the only one bad and it runs both odometer and trip meter. Very straight forward but a magnifying glass would help counting the teeth. And it's the small teeth you most need to count, not the larger ones that will be broken.

And yes, odometergears.com is still in busines.

I'm all back together and my odometer works great. ***** now is that my speedometer is now broken. It did nothing until I got to about 35 and slowly went up to about 30. By the time I got to 45 it was just below 40 and did not go higher. It also is still sitting at about 40.

Any thoughts?
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Old 12-14-2009, 05:58 PM
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Your 85 should be the same as my 87. You will need the 20/30 gear. This gear drives both odometer and trip meter and it is usually the cause of the problem .
Rotating your needle a couple notches should get you close.
Old 12-14-2009, 06:01 PM
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Thanks guys.

Chris, maybe you pushed the needle back on too tight?
It sounds like it is binding.
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Old 12-14-2009, 06:14 PM
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Chris,

Rotate the needle CW until it stops and then let it go. It should go back to 0 mph. If not you need to re-position the needle to the proper low mark.

Another issue may be the tabs in the trip meter. Sometimes they get stuck in the close position and they do not let the speedo advance. A friend of mine had this problem.

Nick
Old 12-14-2009, 07:33 PM
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Thanks guys. Lessons learned. What I found was the needle was hitting the inside of the glass. Totally disasembled again (pretty easy the second time...), found the issue, back together and I'm golden to include being within one MPH of my GPS!!!

Now my lessons.

1. Diagram the hardware, number and bag. Of the six screws on the back, four are sheet metal screws, two are machine screws. Three phillips head, three slot.

2. Remove the needle with the twisting approach... So much easier and not a big deal.

3. The needle goes back on much easier than it came off and it doesn't go on very far.

4. The needle shaft is tiny. So tiny I thought I had broken it initially because I had to put glasses on to see it.

5. When you put the mechanism back in the case, make sure the wires, etc do not get bound up. My problem ultimately was that the mechanism was not sitting flat in the case. Looking at the face it should have an even gap around the perimeter to the case. Clue one for me.

6. When it's fixed leave the face off, connect it and test it. The bezel is the real pain for the project and you don't want to do it twice like I did.

7. With the face on, press against it and roll guage in your hand to ensure the needle is moving freely. This would have been clue two for me.

8. Small needle nose work well to flatten the bexel edge before putting it back on. Just run around like you're opening a can or whatever.

9. Take your time flattening the bezel back on. Assume in advance that's it's going to be chewed up a bit but it gets covered by the rubber grommet.

Thanks so much for the original post. There is a link at odometergears.com. These guys are great to deal with. I had my gear in 36 hours (they are only 30 miles away). They also sent me the next size gear in case and that's the one I actually needed! I guess they get that a lot.

Hope a couple of these "gotchas" will help the next reader.
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Old 12-14-2009, 08:20 PM
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Hi gang -
I'm new here (this is my first thread), and I just wanted to pass on a huge THANK YOU for this fantastic how-to. There is no way I could have done this job w/ the lousy 1 page/no picture instruction sheet that I have, but this thread is great and I got it done in about an hour w/ no problems.

Can't wait to test it tomorrow and am very excited about the prospect of having a functioning odometer again

PS Here's my car - I've owned it for 25 years
Old 01-12-2010, 06:01 PM
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GPS odometer

I wonder if rather than going through all this hassle, it might be cheaper/easier just to by ~$50 GPS unit that can keep track of your mileage. I've seen some on the web for hikers, etc. Anyone tried one of those? I don't know if the memory would be erased every time the battery ran out though.
Old 03-24-2010, 12:14 PM
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Old 03-24-2010, 02:14 PM
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If the speedometer works and not the odometer on a 86 911 is ti the gear that is probably gone?
Old 03-28-2010, 08:14 AM
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Quote:
Originally Posted by mongo460 View Post
If the speedometer works and not the odometer on a 86 911 is ti the gear that is probably gone?
Most likely. The odometer is a small stepper motor driven by the IC that runs the speedometer.

smokey speedo
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Old 03-28-2010, 09:11 AM
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1986 911 do I need to remove steering wheel first to get the speedometer out?
Old 03-29-2010, 11:59 AM
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Wish i found this before i attempted this myself, i ended up breaking the shaft of the needle, is there anywhere i could purchase a new OE speedo, or have mine repaired, I'm not really digging the whole wd-40 tube idea.
Old 05-18-2010, 12:41 AM
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I just sent mine to North Hollywood Speedometer, the eztimated cost to repair was $130.
There is a lot of work I'll do like, replacing the clutch, recovering my Targa top and other misc tasks but this one I decided to farm out...just too phreakin teadious
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Old 05-18-2010, 02:14 AM
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Speedo Needle at 240 after gear replacement

I completed the odometer gear replacement on my Euro '80 911SC. Everything went smoothly thanks to the excellent step by step assistance provided by the Forum Users.

Now I have a new problem. I reconnected the electronics to test the spedo but when I turn on the ignition the needle immediately moves CW to the 240KM stop.

I dissasembled the speedo to make sure the paper insulation was in place and not shorting the circuit. Everything seems to be assembled correctly but the problem persists. The needle is at the 10 KM point at rest.

Is this merely a calibration problem or is there something more serious?

Should I remove the needle, turn on the ignition and then replace the needle on the shaft?

What advice can you give me to resolve this problem?
Thanks
Old 05-30-2010, 03:02 PM
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Was the speedo part working correctly before you made the gear replacment?
Are you sure you got the wires back on the correct posts?
Sounds like you may have some wires crossed.
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Old 05-30-2010, 03:20 PM
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Just doing the odo gear replacement. Is it necessary to put any lube on the gears? Petroleum eats nylon (it looks like that's what broke down the odo gear). Would something synthetic work better?

Also, anyone have more pictures? Not sure where the flat metal piece came off.
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Old 06-26-2010, 10:51 AM
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Also, where does the rubber piece go? (I hate myself for not taking pictures during disassembly)



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Old 06-26-2010, 11:26 AM
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John,
You must have been answered already, or just figured it out, maybe not.
The rubber item can be seen on page two, in NickCG's series of pictures. I believe it shows at the bottom inside of the case in about the third picture or so.
The metal sheet looks to go between the three posts (screw receptacles) on the top of the assembly shown in picture 8 on page one. The cutouts on the sheet match up well with the receptacles. It might go underneath that white piece?
Anyway, that's how it looks to me; and I'll know soon enough, when I do this task myself!

Last edited by nesslar; 07-17-2010 at 07:52 AM..
Old 07-17-2010, 07:48 AM
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I did figure it out. I figured out where the rubber piece went when I noticed the green dot inside it. Up until then, I couldn't figure out why one of the light bulbs would be blocked.
Old 07-17-2010, 04:30 PM
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Disassembled speedo tonight. Got the needle off with no problems using the twisting method. Ordering the gear tonight, so hopefully should have it working by next weekend.
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Old 07-25-2010, 06:04 PM
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