(to be honest, i've been nagged into this )
If you think your speedo is reading faster than your car is going, OR, if you think your speedo is reading slower than your going L@@K HERE:
This thread is more to do with other speedo faults/failures.
This pic identifys the difference between your speedo and your odometer.
This speedo is Commodore (no Torana speedo was harmed during the production of this thread)as sometimes people might say my speedo isn't working when in fact it is, but the odometer isn't.
Also shown is a trip meter.
Now that the glossery and terms are out of the way, we'll start at the source.
This is the output shaft of an Aussie 4 speed. You will see the hole in the shaft that drives the clip for the speedo gear. This shaft also drives your tail shaft.
The speedo drive gear clip is made from spring steel.
It fits into the hole in the output shaft.
And the clip drives the plastic speedo drive gear. The splines you can see in the gear are just to let the gear slide over the splines in the shaft, they do not drive the gear, only the clip does.
So here is the output shaft, driving the clip which drives the gear. These are all housed in the extension housing.
The drive gear drives the driven gear which drives the damn cable.
Driven gear is blue in this instance but there are other colours as well as different coloured drive gears.
Tomorrow, the damn cable, which is the most common reason for most speedo faults.
Edited by rodomo, 17 June 2010 - 01:09 AM.