Odometer skipped ahead

[themechanic]

I restored my original non-rally gauge cluster in my 69 Coronet R/T some years ago. Since the odometer was faded and yellowed, I used the stickers made for the odometer and chose to keep the current mileage on the odometer instead of resetting it to zero. At that time I replaced the speedometer cable with a new one which I lubricated before installing it. I drove the car and verified the speedometer operated as it should and was accurate and noted the mileage appeared to increase normally.

Fast forward to a few months ago when I had the engine rebuilt. The shop recorded the mileage at 90,013 miles. When I got the car back I didn't notice right away that the odometer seems to have jumped ahead to 1200 miles until after a few drives to break-in the piston rings; That's over 10,000 miles. I know I have only driven less than 200 miles since the rebuild.

What could be the problem?

3rd photo is after restoration and just before reinstallation.

 

[pnora]

You most likely do not have the odometer wheels lock plates indexed and secured on the bar.

 

[themechanic]

You most likely do not have the odometer wheels lock plates indexed and secured on the bar.

I'm not sure what you're talking about. I removed the cylinder with the numbers and installed the stickers and replaced the cylinder. The odometer worked for years afterwards (about 1,000 miles).

 

[Sam69sat]

You most likely do not have the odometer wheels lock plates indexed and secured on the bar.

I haven't had one apart for a while but i believe this is what pnora is talking about. Those little legs need to be up against the stop.

 

[pnora]

I'm not sure what you're talking about. I removed the cylinder with the numbers and installed the stickers and replaced the cylinder. The odometer worked for years afterwards (about 1,000 miles).

If you do not understand , then what I described above is most likely what you overlooked.

 

[66 Sat]

Ferris Bueller been borrowing the car?

 

[themechanic]

If you do not understand , then what I described above is most likely what you overlooked.

Maybe. But wouldn't that be a problem right away or can it hide for several hundred miles before showing up?

 

[themechanic]

I posted photos just now.

Looks like the only way the cylinder could raise up on one side (left, in this case) is if that clip came off somehow or is missing for some reason.

 

[pnora]

Maybe. But wouldn't that be a problem right away or can it hide for several hundred miles before showing up?

Would depend on which one is out of place.

 

[Sam69sat]

If the thousand wheel (or ten thousand) doesn't have the index locked up against the stop plate, could it/they be dragged along every time the hundred mile wheel rolls over? Seems plausible.

 

[themechanic]

Would be nice if the Chrysler engineer who designed the dash would have made it so the gauges abd speedometer could be replaced without disassembling the entire dashboard.