The speedometer needle either does not move or jumps wildly when it does move. I have made sure that the cable connection at the gauge is secure. I also had the gauge rebuilt by Smiths several years ago. Could the cable be binding internally? Please advise. Thanks!
Dave
Submitted by mfrank@westnet.com on Sat, 06/18/2011 - 18:21
Submitted by SE98-32482CJ on Sat, 06/18/2011 - 09:34
1955 Mk VIIM speedometer
Dave use a drill from the end of the cable at the trans--if still jerky check at the speedo head by removing the speedo and see if it is in the cable or the head.
Submitted by liddie23@opton… on Sat, 06/18/2011 - 09:31
1955 Mk VIIM speedometer
What's the best way to test it? Will an electric drill work? What bit size should I use? (I'd be afraid of damaging the gauge with the wrong one!).
Submitted by SE98-32482CJ on Fri, 06/17/2011 - 18:34
1955 Mk VIIM speedometer
Could be binding Dave--why not test it with the speedo removed?
It's a good idea to make up a short length of speedometer cable, cut from the square end of the old cable. Insert it in the speedo, and make sure you can turn it manually before you chuck it up. If you can't turn it freely, the speedo is jammed, and you don't want to apply the drill.
Usually no reading means your cable snapped, so you may have a scrap cable to use as your tool.