Strange speedo problem [Archive] - Team Camaro Tech

: Strange speedo problem


kcart55
Aug 7th, 09, 07:09 PM
My odometer on my '69 appears to be recording mileage accurately, but the speedometer part is reading way low, (@ 60 mph it's reading about 22 mph) I've checked the gears in the M21, and they are correct. It's not a big issue, just annoying. Thanks, Kevin :thumbsup:

novaderrik
Aug 7th, 09, 08:59 PM
could be that the lube is dried out or there is some dirt or something in there.

Steptoe
Aug 7th, 09, 10:08 PM
The odometer and sped ometer work off the same gear in the back and in the trans.
So If the odometer is correct the cable has to be working correct...therefore the fault has to me in the gauge...
If the gauge has ever been wound back, or oil used to lube the cable...these can cause issues in the gauge
OR it has sucked a kumura.

kcart55
Aug 8th, 09, 03:15 PM
If the gauge has ever been wound back

Yes, I did turn it back after restoring the car. How did that damage it? Is it repairable, or am I in the market for a new one?

Steptoe
Aug 8th, 09, 09:55 PM
or am I in the market for a new one?
Well if you aree in NZ, it is cheaper to get repaired, as Im not in the States you will have to cost that out yourself...sry

novaderrik
Aug 9th, 09, 04:40 AM
Yes, I did turn it back after restoring the car. How did that damage it? Is it repairable, or am I in the market for a new one?
how did you "turn it back"?
did you take the needle off at all? if so, it might not have gotten put back in the right spot.
or maybe you messed up the magnetism of the gizmo (pardon the technical term) that makes the needle move..

kcart55
Aug 9th, 09, 06:20 AM
how did you "turn it back"?


It's been about six months since I did it, but I recall I just turned the "wheels" backwards. I did not remove the needle. One thing it does is when I got to 100 miles, all the numbers advanced and all of a sudden I had 11,xxx miles and then after the next 100 miles I had 22,xxx miles. :o

alanrw
Aug 9th, 09, 07:20 AM
It's been about six months since I did it, but I recall I just turned the "wheels" backwards. I did not remove the needle. One thing it does is when I got to 100 miles, all the numbers advanced and all of a sudden I had 11,xxx miles and then after the next 100 miles I had 22,xxx miles. :o

Make sure the ground to the Flux Capacitor is properly attached.

:D

alan

Steptoe
Aug 9th, 09, 02:37 PM
I have no 'evidence' tosupport this therory, other than winding back US, Aussie, British , speedos since the mid 60s screws them up more often than not..and this depends on what car makers..
Winding back was common in the pre 60s, then in the 60s ppl realy started to jump up and down about buying low milage cars where the pedals where worn out and the speedo showee stuff all...
I Do suspect manufactures may have put in some sort of weak lug or something , so if would back more than normal reversing they screwed up....
The pre 60, just hook a drill on and wind back nps.....

Winding back of 2nd hand japper cars imported into NZ used to be a huge political problem... to check one pulled the dash out and checked for wax seals broken and marks on the screw on the back of the gauge or pressened crimped edges...
to wind these back meant going inside the speedo and physically turning the tumblers..
Which I believe is still the correct way to do it.
NOTE: it is illegal to turn back in NZ, and heavy fines and compensation if one does.