Thread: Speedo problems

gidday
try this
could be the right angle gearbox (attached behind the speedo) has dried up and got partial siezed . i have had good results by first removing then cleaning out old grease then re appling new high temp grease.
rob

yep, its the little gearbox that always gives me dramas. i had to get a second han one as mine would just pack in after 50kms or so now its perfect.

cheers, andy

Cheers, i will give the right angle drive a good look at and clean and see how it goes.

Rick

The ODO may be a clue.
I had the ODO stop in my 81 in Saudi. the problem was that there is a little lever beside the input of the cable into the speedo, which pushes the cog that changes the odo.
This lever has a cross shaft that goes across to the other side of the cable input and this shaft can seize.

Of course it may just be the right angle gear, and if you re grease and then CAREFULLY reset the preload by tapping in the cap it may work again.
Another possibility is that the "square" on the end of the cable has become round or worn the female part in the speedo out.

A third possibilty is that the big nut on your transfer output shaft has come loose and the speedo gear is not turning .

I have had all of these.
Regards Philip A
Of course the most obvious is that you have a broken cable

Thanks, will look into that as well.

Speedo is actually working atm, just the needle jumps. ie, driving at 100km/hr, speedo reads 90 (tyres) but jumps up to 110/120 at regular intivals, like every 2 seconds. Odo dosn't turn over. Trip meter is a no go as well.

Driving today, it actually fixed itself for around 100km then stopped again. Seems it stops when the second last digit of the odo tries to turn over from 9 to 0.

Seems it stops when the second last digit of the odo tries to turn over from 9 to 0.

That is the frozen pushrod/Johnson rod problem.

Fix it fast or it will strip a tooth off the tiny rachet cog that it pushes.Each push is one tenth of a kilometer, then the cylinder of tenths pushes the cylinder of ones by one and so on if you get the drift. so when the first cylinder tries to push the second it is sticking and probably the little rod is popping out of the sawtooth it pushes.

I don't like your odds of getting a new one. I repaired mine with a tiny file and some epoxy plastic stuff you could get in the 1980s.

Regards Philip A