Speedo in reverse!

[buzzer]

Trying to get my speedo to work today. TCS 5 365 box.
Speedo cable rotating in reverse

Any ideas!!!!

[jbcollier]

Explain "Speedo working in reverse"

It is turning the opposite direction?

Is it an original box?

Original speedo?

[surfguitar58]

I thought that only happened in the Southern Hemisphere.

[4129R]

If it is a Renault gearbox, and not a Lotus gearbox, don't they rotate different ways, as the gearbox on the Renault is mounted the other way around?

[buzzer]

The drive rotates the wrong way looking at the front of the drive cable when in the drivers seat it rotates anti-clockwise when driving forwards.
I did rebuild the gearbox and it all looked like the manual.
Lotus europa speedo. New speedo cable and new drive gear from Banks. Don’t know if the box is the original box



[size=0px]I thought that only happened in the Southern Hemisphere.[/size]
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In the Renault I thought they were driven a different way but the basic same internals.


The car has 5 forward gears before anyone asks.....


So it really confusing. What am I not seeing

[jbcollier]

New speedo "drive" gear:

The plastic driven gear?

Or, the metal scroll gear on the pinion shaft?

[4129R]

For the car to go forwards, and the drive cable to go backwards, both drive and driven gears at the cable joint would have to be reversed. Not very likely.

I think you need to compare what you have got, with what is standard and works correctly, which means taking the car to someone who has similar but standard.

I have a gearbox out and speedo drive cables with the gears, up here in Norfolk if that is any help. 

[buzzer]

The new gear was the metal pinion gear that the speedo cable fits into. And I got this from Banks europa.
I’ll dig out my pictures I took of the gearbox internals and speedo drive before I assembled it and post them for comparison.

[4129R]

I know it's a stupid question, but are you sure it is going around the wrong way, because when you look at the speedo cable, it is a mirror image of what it is going in to the speedo itself.

There is no possible explanation for the cable going backwards.

[jbcollier]

The speedo drives all turn the same way.  It's the ring and pinion that are changed to get the different rotation directions for the half-shafts.

All the speedometers I have worked on are direct drive.  The cable turns a magnitized drum which turns a spring loaded drum with the indicating needle attached.  So the cable turns in the same direction as the speedo needle.

On a Europa, with the speedo cable end pointed towards the driver, the inner cable should turn clockwise.

[buzzer]

Checked again this evening definately the inner cable is rotating anti-clockwise when driving forward. What could I have done wrong when assembling the gearbox. It’s totally baffling.
Will pull the speedo cable from the box and pull the pinion shaft next.

[jbcollier]

"The car has 5 forward gears before anyone asks....."

You're sure?

[buzzer]

Yep 5 forward gears 1 reverse. Driven it. And the engine is in the back before I get asked that!
The only thing I can think is if I had a wrong nylon speedo drive gear (if there is such a gear) on the end of the driven shaft and the speedo pinion gear not fully engaged it could be driven backwards. Going to check that next when I take the pinion gear out I should be able to see the gear on the end of the driven shaft.
I’ll take a video too of it going backwards!

[jbcollier]

The scroll gear on the pinion shaft only goes the one way.  Some scroll gears are not handed but, even if you flip them, they still go the same way.  Not sure what is up.

[4129R]

Maybe your speedo is reminiscing, and wants to go back to the 70s.

Time travel in a Europa, instead of a De Lorean.

There must be a logical explanation. Time to contact Mr Spock.

So far you have defied all logic.