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Eng-o-neer
Join Date: Dec 2011
Location: Los Angeles
Posts: 3,107
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Slightly different broken odometer...
I have a 1970 911 and the odo broke in a new way...It rolled over from 39,999 to 39,000 and I fear it'll do it again. It has worked flawlessly for the last 3,000 miles, and continues to count miles (trip odo too), but now it's 1,000 miles off, and I suspect will get worse each thousand.
So. I've replaced that notorious gear before on an 80s car, but I've never had to mess with the cluster of numbers. Has anyone done this themselves? What am I in for? Last time the hard part was simply opening and closing up the speedo without damaging anything, but this time I fear what will be involved with the internals. North Hollywood Speedometer wants about $400 to repair it, so Im inclined to at least investigate how involved this will be once I get it open... |
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04-12-2022, 10:06 AM
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Registered
Join Date: Aug 2015
Location: Topanga, CA
Posts: 109
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https://youtu.be/pvm23fMcSEA
this vid helped give me confidence to fiddle around with the everything inside the speedo. i think i was more nervous about opening and ruining the bezels and bending the actual needle; but it wasnt as wild as i expected |
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04-12-2022, 10:09 AM
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Eng-o-neer
Join Date: Dec 2011
Location: Los Angeles
Posts: 3,107
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That video is handy!
West Valley Speedometer quoted me $250, and I'm still waiting on Palo Alto Speedometer and Overseas Speedometer to get back to me, but that's a bit easier to swallow. While I'm monkeying around, I might as well surface some useful info on this topic...Good info on DIY repair here: Odometer Gear replacement for Electronic Speedometers (long) Some better shots of the numbers gears here: Odometer, which gear question? |
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04-12-2022, 11:08 AM
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Registered
Join Date: Oct 2004
Location: S California
Posts: 7,965
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That's a great video for an electronic speedometer, but doesn't really help with the mechanical ones.
I've repaired a lot of speedometers/odometers and have never come across the issue you're seeing. Typically, with the mechanical speedometers it's the pot-metal gear that comes loose causing the odometer to stop working. In your case, my guess would be that you have either a broken number wheel (100's or 1000's position) or a broken little advance wheel between those 2 number wheels. The mechanical speedos are a little more difficult to work on than the electronic ones. At least in my experience. They don't have the mechanical stops that allow you to twist the needle to losen it like the electronic ones. I have a process to disassemble them but it's more than I can type in a post. I'd be happy to help via email if you'd like. I also have a bunch of spare parts if you find something broken. Or, if you want, I'll fix it for you. Probably $150-$175. I don't charge anything for the parts since I have a pile of speedos I use for parts.
__________________
1970 911E Sportomatic Albert Blue 1971 911T Sunroof Coupe w/ Twin Plug 2.5 MFI 1973 911E Glacier Blue 1973 911E RSR Tribute Viper Green w/ 3.5 Twin Plug MFI |
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04-12-2022, 11:20 AM
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Eng-o-neer
Join Date: Dec 2011
Location: Los Angeles
Posts: 3,107
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I might take you up on that!
Another video of an earlier ('74) gauge: https://www.youtube.com/watch?v=2OOFdHvFKbI&ab_channel=MTDesign |
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04-12-2022, 11:30 AM
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Registered
Join Date: Oct 2004
Location: S California
Posts: 7,965
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Quote:
Take a shot at it... I bet you can get it fixed. Happy to help if I can and if you find something broken just let me know and I'll find a replacement for you. I'm in Anaheim.. Cheers
__________________
1970 911E Sportomatic Albert Blue 1971 911T Sunroof Coupe w/ Twin Plug 2.5 MFI 1973 911E Glacier Blue 1973 911E RSR Tribute Viper Green w/ 3.5 Twin Plug MFI |
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04-12-2022, 12:13 PM
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Registered
Join Date: Jan 2011
Location: Gulf Coast FL
Posts: 1,484
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Quote:
 John did an awesome job fixing up my mechanical speedo trip and main odometer
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04-12-2022, 12:14 PM
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