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| Joined: | 04-07-2022 |
| Location: | Oregon USA |
| Posts: | 65 |
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I did that with the speedo cable. Cleaned it all up, lubricated it, tested it with a drill and everything seemed to work great. Until I put it back in the car. It's a project "for one of these days" that I'll eventually look at again.
Working on the second JH restoration now.
Second Restoration? Awesome! =:-o
As to the failure to fix the speedo, I will share my experience with a TR6 speedo problem, which you may find illuminating.
My speedo jumped around, but not continuously. Instead, it was very rhythmic - A steady reading for a few seconds, then a sudden bounce of the needle, then several seconds of a correct reading. The interval between bounces varied according to speed of the car.
I opened the speedo and discovered that the plastic gear that drove the odometer had cracked. When the crack rotated around to increment the odometer, the speedometer would bounce. The force required to drive the speedometer would increase sharply when the cracked gear would try to increment the odometer, causing the cable to twist and then untwist as it overcame the increased turning resistance.
The solution was to have a speedometer repair service rebuild the gauge. It was $90 to have it overhauled and calibrated. This was several years ago, so expect to pay more now.
An alternative would have been a used speedometer (which may itself have problems) and reset the odometer to the correct mileage before installation. The mileage can be reset using a dental pick, proceeding from the highest decimal place to the lowest. Did this on my TR7 Sprint when I ditched the 85 MPH speedo in favor of a 140 MPH unit.
Cheers,
Vance