Speedo running too fast

[oldskoolsteve]

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!
_________________
63 Type 3 1500 notch
84 WESTY: Suby EJ22 powered
85 WESTY: needs engine and trans
Hoodride for life

[MarkWard]

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.

[crazyvwvanman]

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]

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.
_________________
63 Type 3 1500 notch
84 WESTY: Suby EJ22 powered
85 WESTY: needs engine and trans
Hoodride for life

[Zeitgeist 13]

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

'89 Bluestar ALH w/12mm Waldo pump, PP764 and GT2052
'01 Weekender --> full camper
y u rune klassik?

[oldskoolsteve]

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.
_________________
63 Type 3 1500 notch
84 WESTY: Suby EJ22 powered
85 WESTY: needs engine and trans
Hoodride for life

[fxr]

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?).
_________________
Jim Crowther
1984 1.9l EJ22 Westy Wolfsburg Edition
Vespa GTS 300

[MarkWard]

[0to60in6min]

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

[oldskoolsteve]

[Mikesarge]

[?Waldo?]

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.

[Abscate]

[Zeitgeist 13]

Some comedy just writes itself.
_________________
Casey--

'89 Bluestar ALH w/12mm Waldo pump, PP764 and GT2052
'01 Weekender --> full camper
y u rune klassik?

[Abscate]

They are bound to get it , eventually.
_________________
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[MarkWard]

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