Series 3 Speedo Calibration

The good news is that my Landy got its MOT last week after a year and a bit of rebuilding it. However after doing some road trials I notice the oddometer milage is about twice what I believe I have done. For a 1.2 mile journey it reads about 2.5 miles. Now I can't believe the wrong size tyres can make that much of a difference so can anyone advise how to recalibrate this. The speedo seems about right????

Thanks

have you accounted for going there and getting back

had me little joke now heres some good info on speedos, sounds like something is not standard either at the gearbox end or the speedo itself, and by checking its serial no on front might see if its correct for vehicle or swapped over in past

Thanks Steve, I believe its the original Gearbox, but unable to confirm the speedo. I did have to replace the cable which was broken.

doh this was the good info i was referrring to


Selecting your Speedo.

the rims and tyres will have an effect, speedo as well, get your sat nav out, and check the speed according to you sat nav, a good way of checking your speedo

at least your works any one got any ideas i fitted a new cable didnt fix it unpluged the cable at the speedo end and drove down the road and put my finger in the plug to feel it turning and couldnt so id say its the box but is there out i can do about that/

Have you tried putting the cable in the speedo and turning the gearbox end

if it works then problem at other end so need to look at the speedo output drive, on the pic the drive comes from the big worm wheel on the shaft this turns the speedo shaft in the housing which the cable fits to.

you can remove the 2 screws on the speedo connector plate to get a better look at the shaft to see it it turns when on axles in gear and rear wheels turning

if the shafts not turning then a problem - need help here form g/b guru

i can't remember if the worm drive is keyed to the shaft or

its free to spin on shaft and only spins by friction which you change by adusting the shims on the housing

no i thought of that but couldnt think how to turn it fast enough but it just came to me use me cordless ill try that be for takein out of the box thanks