-
Hi Guest!
You can help ensure that British Car Forum (BCF) continues to provide a great place to engage in the British car hobby! If you find BCF a beneficial community, please consider supporting our efforts with a subscription.
There are some perks with a member upgrade!**Upgrade Now**
(PS: Subscribers don't see this gawd-aweful banner
Hey - did you know if you click on the title of a thread it will take you to the first unread post since you last visited that thread?
but were afraid to ask: 
STOP!! Never post your email address in open forums. Bots can "harvest" your email! If you must share your email use a Private Message or use the 
smilie in place of the real @
Pretty Please - add it to our Events forum(s) and add to the calendar! >> 
TR2/3/3A Speedometer needle bounce?
- Thread starter karls59tr
- Start date
Share this page
CJD
Yoda
Offline
A regular bounce (about 2-3 per second) can be caused by a couple things. Most common would be a drive cable that is binding. The solution to that is to pull out the cable to clean and re-grease it for the full length. The other cause would be if the aluminum disc inside the speedo is bent, so it rubs against the magnet. The latter cause would only be possible if the speedo has been taken apart previously and not put back together properly. So money is on the speedo cable.
A rapid, but small, consistent fluctuation is normally from the odometer gears binding and in need of cleaning and lubrication. The gage has to come apart to do that too. If left too long, binding inside the gage will eventually unravel the drive cable.
A gentle bounce as you hit bumps and such is normal operation of a mechanical gage and cannot be changed. You can even make the tach needle bounce by Revington the motor quickly up and down...just the nature of the design. I once had a Vette that was so fast I could bounce the the speedo needle by accelerating so fast (0-60 in 2.3 sec).
A rapid, but small, consistent fluctuation is normally from the odometer gears binding and in need of cleaning and lubrication. The gage has to come apart to do that too. If left too long, binding inside the gage will eventually unravel the drive cable.
A gentle bounce as you hit bumps and such is normal operation of a mechanical gage and cannot be changed. You can even make the tach needle bounce by Revington the motor quickly up and down...just the nature of the design. I once had a Vette that was so fast I could bounce the the speedo needle by accelerating so fast (0-60 in 2.3 sec).
Last edited: