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Healy speedometer is running too fast
- Thread starter Jersey
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Bob_Spidell
Yoda
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You haven't provided much data, but I've been working a lot on my speedometer(s) lately so I'll try to help. First, has this just started, or has your speedo always indicated high? Is it (reasonably, for a Healey) steady, or does it jump around? Do the odometer and trip meter seem to work correctly? Does it read accurately on the way up, and too high on the way down?
Assuming it's reasonably steady--Healey speedos are rarely rock solid at all speeds--and the odometer works you can probably calibrate the speedo with a formula (e.g. https://www.angelfire.com/fl/procrastination/rear.html ) or over a timed mile. Remove your speedo from your car and twist the chrome bezel to remove the glass. The needle stop can be pushed back into the speedo to allow the needle to swing freely. With the speedo in a normal vertical position note the position, then gently pull the needle indicator off--it's a press fit--and replace it at about a 5mph slower position. Push the needle stop in to get the needle on the correct side, reinstall in your car then test again.
If the speedo reads 10mph fast across its range this should get it close. Note that the speedo isn't likely to be spot on at all speeds, you probably want it most accurate between 30 and 70mph, below that you shouldn't get in trouble and above that it's just a matter of how much trouble :wink:
Assuming it's reasonably steady--Healey speedos are rarely rock solid at all speeds--and the odometer works you can probably calibrate the speedo with a formula (e.g. https://www.angelfire.com/fl/procrastination/rear.html ) or over a timed mile. Remove your speedo from your car and twist the chrome bezel to remove the glass. The needle stop can be pushed back into the speedo to allow the needle to swing freely. With the speedo in a normal vertical position note the position, then gently pull the needle indicator off--it's a press fit--and replace it at about a 5mph slower position. Push the needle stop in to get the needle on the correct side, reinstall in your car then test again.
If the speedo reads 10mph fast across its range this should get it close. Note that the speedo isn't likely to be spot on at all speeds, you probably want it most accurate between 30 and 70mph, below that you shouldn't get in trouble and above that it's just a matter of how much trouble :wink:
Hey Jersey,
Do you have the original rear and transmission in the car? If your car did not have an overdrive, that could cause he problem. That was the case with my speedo. I neeed to get my recalibrated since I replaced my transmission with a Toyota 5 speed.
Humdog
Do you have the original rear and transmission in the car? If your car did not have an overdrive, that could cause he problem. That was the case with my speedo. I neeed to get my recalibrated since I replaced my transmission with a Toyota 5 speed.
Humdog
Bob_Spidell
Yoda
Offline
You're quite welcome. This might help with your fact-finding: https://www.healey6.com/Technical/Repairing Speedometers.pdf