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Speedometer cable question


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Hi Mark,

I was having an 'invention moment' a while ago and needed to know what was happening.

The red leds mimic the stop lights - if the stop light filament fails for whatever reason the led will not illuminate when the pedal is pressed.

The green leds indicate what the overdrive is doing - I was playing with some OD logic devices and needed to know what the circuit was doing.

 

The panel is now redundant and thje ash tray re-inserted. However I have kept the stop light indicator and hidden the leds.

I have gone back to the normal OD switch - far better than silly logic circuits.

 

Roger

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  • 7 years later...

Great info on this page, tho I am 8 years down the road.....seems everyone has angle drive.  What about the Tr4 without?  The cable goes straight in the gearbox but my new one only barely enters the pinion.  How far is is supposed to go in gearbox?  My broken cable was in for about 1" and snapped.   I pulled out with skinny needle nose and thought the new cable would go right back in.  Not.   Also. the Speedometer is now a tad difficult to get in and it seems drive cable is a little long sticking out (by probably the amount lost at gearbox).  I have a hard time screwing both end caps in with the tension on cable.   Finally, would the pinion gear at gearbox have seized breaking original cable and making it hard to line up the new cable properly to go all the way in, assuming its squared off inside and you cant put square peg in the round hole.   Any ideas and I would be more than greatful!  Cheers.

 

Edited by tr4head
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9 hours ago, tr4head said:

Great info on this page, tho I am 8 years down the road.....seems everyone has angle drive.  What about the Tr4 without?  The cable goes straight in the gearbox but my new one only barely enters the pinion.  How far is is supposed to go in gearbox?  My broken cable was in for about 1" and snapped.   I pulled out with skinny needle nose and thought the new cable would go right back in.  Not.   Also. the Speedometer is now a tad difficult to get in and it seems drive cable is a little long sticking out (by probably the amount lost at gearbox).  I have a hard time screwing both end caps in with the tension on cable.   Finally, would the pinion gear at gearbox have seized breaking original cable and making it hard to line up the new cable properly to go all the way in, assuming its squared off inside and you cant put square peg in the round hole.   Any ideas and I would be more than greatful!  Cheers.

 

The gearbox end of the cable needs to be free to slide right in, the inner cable is secured in position by the collar at the speedo end, which as you have said is sticking out too far to get the nut on.

I would suggest that there is still some remains in the speedo drive hole of the old cable, although I have also come across new cables being slightly too big, requiring a light touch with some emery paper to clean up the square on the end.

The speedo drive unit can be removed if it is easier to work on the bench to see whats in there stopping the cable entering.

Ralph

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I had same issue with the gearbox end of the cable, required a bit of light filing before it fitted neatly into the drive unit, when I made initial enquiries with TRGB (who supplied the cable), they admitted that occasionally they have to do this on cars they are working on

David

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I had a similar problem.

Re-calibrated and reconditioned speedo stopped working. Checked cable and it was perfect, so I checked the angle drive. The remains of the square end was stuck (brazed) in the angle drive with a few wisps of cable remaining. The new cable had been inserted and tightened as a friction fit and it actually worked for 7000 miles.

We (John Morrison and I) decided to ditch the angle drive and a longer cable was purchased and a hole in the chassis was relieved slightly to allow the cable and nut to pass through. It works and no pesky angle drive to worry about

Andy

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