Odometer Quit
Thread Starter
Intermediate
Joined: Sep 2013
Posts: 41
Likes: 7
From: Palm Coast Florida
Odometer Quit
The odometer on my '68 stopped a while back. Speedometer works fine. I'm assuming a cable issue, but suppose it can be internal to the mechanism itself. Has anyone experienced this and fixed it? What are the "usual" causes? If I want accuracy, can the odometer be rolled forward?
Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,753
From: Charlotte NC
It is NOT a cable due to your speedometer work...it IS internal. It is a gear inside that went bad/locked up or stripped out...or it can be worse than that. But it can be repaired.
Even though I know how to mess with the odometer ...I don't. In my state there is procedure that must be followed so it does not get me involved with any misrepresentation in the future of the actual mileage. SO I do not even mess with it.
DUB
Even though I know how to mess with the odometer ...I don't. In my state there is procedure that must be followed so it does not get me involved with any misrepresentation in the future of the actual mileage. SO I do not even mess with it.
DUB
Race Director
Joined: Sep 1999
Posts: 11,358
Likes: 379
From: Plano TX
There are 2 drive shafts for the odo inside the speedo. The first is driven right off the input shaft the cable attaches to. That shaft then drives a second one which in turn drives the odo. On the C3 speedos I've taken apart that first shaft is plastic and likes to snap in half. The speedo needle is not driven by these shafts so it continues to work. The second shaft is metal and will be fine.
The broken plastic can be replaced by a new metal one. It's a fiddly job, but not too bad. Or you can send your speedo in for a rebuild where they also re-calibrate it.
Yes, the odo can be rolled forwards/backwards, whatever you want. When I replaced the odo on my '71 I made the new one read the same as the old one.
The broken plastic can be replaced by a new metal one. It's a fiddly job, but not too bad. Or you can send your speedo in for a rebuild where they also re-calibrate it.
Yes, the odo can be rolled forwards/backwards, whatever you want. When I replaced the odo on my '71 I made the new one read the same as the old one.
Thread Starter
Intermediate
Joined: Sep 2013
Posts: 41
Likes: 7
From: Palm Coast Florida
Thanks. I'll take your advice and outsource.
There are 2 drive shafts for the odo inside the speedo. The first is driven right off the input shaft the cable attaches to. That shaft then drives a second one which in turn drives the odo. On the C3 speedos I've taken apart that first shaft is plastic and likes to snap in half. The speedo needle is not driven by these shafts so it continues to work. The second shaft is metal and will be fine.
The broken plastic can be replaced by a new metal one. It's a fiddly job, but not too bad. Or you can send your speedo in for a rebuild where they also re-calibrate it.
Yes, the odo can be rolled forwards/backwards, whatever you want. When I replaced the odo on my '71 I made the new one read the same as the old one.
The broken plastic can be replaced by a new metal one. It's a fiddly job, but not too bad. Or you can send your speedo in for a rebuild where they also re-calibrate it.
Yes, the odo can be rolled forwards/backwards, whatever you want. When I replaced the odo on my '71 I made the new one read the same as the old one.
Team Owner
Joined: Jun 2001
Posts: 23,327
Likes: 1,043
From: Virginia USA
Check your trip meter reset **** next to the vacuum override switches. Once I reset my trip meter and later noticed my odometer or trip meter weren't working. Come to find out the spring that pulls the trip meter reset **** back up was not working too well and I had to push the **** up a little to get everything to work again.
Race Director
Joined: Sep 1999
Posts: 11,358
Likes: 379
From: Plano TX
Check your trip meter reset **** next to the vacuum override switches. Once I reset my trip meter and later noticed my odometer or trip meter weren't working. Come to find out the spring that pulls the trip meter reset **** back up was not working too well and I had to push the **** up a little to get everything to work again.
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Melting Slicks
Joined: Oct 2001
Posts: 2,059
Likes: 1,359
From: Halifax, Nova Scotia, Canada
My odometer failed last year, input shaft/gear (A) and gear (B) failed. The grease on those gears had turned to dust. I tried replacing gear (B), however the shaft/gear (A) was too worn.
I ended up replacing the entire speedometer with a new one.
After some investigating, it appears that the shaft/gear (A) was used in several other GM speedometers. Some day I may come across an old speedometer that may have the correct shaft and repair my original speedometer.
I have read that the tach uses that same shaft/gear.
Team Owner
Joined: Jun 2001
Posts: 23,327
Likes: 1,043
From: Virginia USA
All I know is I saw what I saw. The .10 mile roller that makes the odometer roll over is on the trip meter. When this isn't turning the odometer doesn't roll over if that is not turning. At least that is what's happened to me.
