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Thu Sep 17, 2020 11:34 am

My speedo is running at about 20 km faster than it should.

I'm unsure how the cable could be responsible for making it read faster so I'm wondering if its internal to the cluster.

Anyone else have any ideas before I send the cluster out for repair?

Any help appreciated.

Thanks!

Thu Sep 17, 2020 12:14 pm

I recall the early vans had a built in error. Tire diameter will affect the reading. A shop that specializes in speedometers could likely "tune" it, but you'd have to provide the % you'd like it adjusted.

There is a small number printed just under the needle center that has the rotational value per mile I believe. You can measure your tire diameter and compare. The speedo in my 82 reads a few miles faster than my GPS, so I just mentally adjust.

Thu Sep 17, 2020 1:38 pm

What is the full exact size tire you have on the left front?

That tire turns the cable. One turn of the tire equals one turn of the cable.
A smaller tire means more cable turns for the same distance.

Mark

oldskoolsteve wrote: My speedo is running at about 20 km faster than it should.

I'm unsure how the cable could be responsible for making it read faster so I'm wondering if its internal to the cluster.

Anyone else have any ideas before I send the cluster out for repair?

Any help appreciated.

Thanks!

Thu Sep 17, 2020 2:06 pm

It's pretty standard at LT195/75R14.

And the gauge was normal until about 115 000 km's and is now at 120 000 km's.

So this is a fairly recent development.

Thu Sep 17, 2020 3:39 pm

Running too fast in a speedo could cause binding of your cable.

Thu Sep 17, 2020 4:27 pm

I would think a binding cable would slow the read out, no?

Something would have to be losing resistance to allow faster travel.

I'm pulling a speedo from another westy of mine to at least know what side is failing.

Thu Sep 17, 2020 4:32 pm

If the odometer is reading sensibly then it'll be the counter-spring in the speedo itself that may have turned a bit (but how and why?).

Thu Sep 17, 2020 4:33 pm

oldskoolsteve wrote: I would think a binding cable would slow the read out, no?

Something would have to be losing resistance to allow faster travel.

I'm pulling a speedo from another westy of mine to at least know what side is failing.

Read it again. I think you missed the humor.

Thu Sep 17, 2020 5:09 pm

is there a possibility that the speedo needle was removed and put back in the wrong position, slightly off on the + side?

Thu Sep 17, 2020 8:25 pm

fxr wrote: If the odometer is reading sensibly then it'll be the counter-spring in the speedo itself that may have turned a bit (but how and why?).

I feel it's something like this causing it.

Thu Sep 17, 2020 8:54 pm

Zeitgeist 13 wrote: Running too fast in a speedo could cause binding of your cable.

This was worth unmuting you for, lol

Thu Sep 17, 2020 9:08 pm

There are two main ways that a speedometer can read inaccurately. One is that it is off by the same amount across the range of speeds. The other is that it reads off by a progressive amount - as the speeds increase it either becomes more or less accurate. Correcting the first issue is easy. Jus remove the needle and place it back onto the speedometer shaft rotated by the appropriate amount to compensate. The progressive inaccuracy is more challenging to correct and it requires adjusting the spring.

Thu Sep 17, 2020 11:23 pm

Zeitgeist 13 wrote: Running too fast in a Speedo could cause binding of your cable.

For those who are still constricted in humor.....

Thu Sep 17, 2020 11:29 pm

Some comedy just writes itself.

Thu Sep 17, 2020 11:38 pm

They are bound to get it , eventually.

Fri Sep 18, 2020 3:35 am

I recently learned jokes violate the “Terms of Agreement” so tread lightly. :wink: