Lou,
Uh oh... there is a short metal part, about 1" long,
that goes between the 90 degree elbow and the transmission.
Hope it wasn't lost! Look at both the elbow, and into the
the transmission.
Most of my speedometer failings are due to a failed
speedo drive gear inside the transmission. This assembly
is held into place with a simple metal tab & 1/4" (early)
or 6mm (later) bolt.
With the rear of the car firmly on jackstands, you should
be able to crawl underneath and remove the speedo cable,
the inspect for the drive pinion to rotate as you spin
the rear wheel (using your foot... sounds odd, until you
get under there and try it). Oh, quite often a small mirror
will help to see things.
Also not a bad idea, while you are under there, to undo
the 1600's elbow from the speedo cable. You should be
able to slide the cable out, wipe it down, and relube
it lightly with white lithium grease.
When you get that inner cable back into the speedo, push
and turn is a little as it is getting towards the end.
This will help get that square end back into speedometer.
Speedo's were all calibrated the same. 68 1600's typically
had 120 mph speedos, while the 68 2000 used 160 mph speedo's.
I remember seeing the '69 & '70 2000's with 140 mph speedo.
All of these used the same calibration (the gear that fits
into the transmission was different on a 1600 & 2000 as they
had different rear end ratios).
Cheers,
Tom
lou daly wrote:
> a couple of questions before i get myself twisted out
> of shape crawling under the dash tomorrow
>
> 1. where can a speedo fail?
> my cable (70 1600 with the 90? degree elbow attaching
> to the tranny) was unplugged at trans and tied out of
> the way
>
> is it possible/common that is can fail inside the
> tranny at the gear (plastic?) on the output shaft?
>
> i guess if the cable turns when the rear wheels turn
> then that part has to be ok (awkward to check that by
> myself)
>
> 2. if i have two speedos
> max 120 mph (i hink it's off a 68)
> and the 140 mph (think it's original)
>
> can i swap them and still expect an accurate reading
>
> thanks in advance
> lou
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