44 replies to this topic

[enderwigginau]

Check that the cable is connected properly in the back of the speedo Wayne.
I've had and seen that to cause a clicking sound quite regularly, and cause bouncing of the needle.
It's the easiest thing to check. If it's not that, replace the cable.

Never seen a clicking noise coming up the cable from the box.

Grant..

[N/A-PWR]

My speedo doesn't work at all initially, then it kicks in a couple of km's down the road and works fine after that. This happens every time I get in the car... Any thoughts?

 

Hi Ben,

Speedo Drive Gear shifting away from the Speedo Driven Gear maybe. Dave I

[EunUCh]

This is a picture of a well sacrificed UC speedo with the needle pointing out the spring,not sure if LH and LX are similar,they are fairly delicate to handle so if you decide to pull one apart and use it again,be careful.

[attachment=43837:spdo.JPG]

Another area that may give problems is where the shaft goes through the body of the speedo.

Due to time the lubricant that was there may tend to dry out or become gummy,this will put more load on the cable

and gears in the box itself.The shaft in the lower of pic. shows the magnetic ring which does as described earlier 

in the thread..do not drop it on hard surfaces or place near other magnets or put it near where you have been

grinding metal.The magnet itself is not just any old magnet,it has several poles or sections around it.

The shaft has a fine spline on it where it pulls out of the plastic on which the magnet is housed.There are also

two thrust washers on the shaft,one for each end.

[attachment=43839:spdo2.JPG]

 

[S pack]

 

My speedo starts to howl like a bitch at about 50 miles an hour,it's enough to bounce all the other gauges around,I tried to reroute the cable but that doesn't seem to effect it, it's a new cable to,the other thing I wondered is that I have a 5 speed commodore box in it and it's a bit longer so the cable is not where it should run but there is no sharp kinks ,my mate thinks it's the speedo head itself,I have got a few spares so I might try swapping the head itself and fitting the 120 MPH facia to an ordinary 100 MPH one if it will work ?

If you swap the 120mph instrument fascia onto a 100mph speedo head you will need to have the speedo re-calibrated by a qualified instrument repairer.

 

Sounds like it may be your speedo cable. You don't have to have tight kinks in the cable casing to upset the operation of the inner cable. The larger the radius of any bends in the cable the better.

 

Install a working 100mph speedo into the instrument panel and see if the problem persists.

Edited by S pack, 06 July 2014 - 12:15 PM.

[S pack]

I had a play with a spare speedo.looks like I can take the drive section off the bottom and use it on the 120 mph facia bit,will try this to see what yhappensis this a legal requirement if I tamper with the speedo ??

Do you want to chance a speeding ticket???

[Statler]

Yes Glen, although the color of the drive gear may not be correct for your car. 

 

When you remove the speedo cable from the box, the drive cog will push onto the end of the cable. You will see how the inner cable needs to fit inside the square recess in the cog.