<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
Ira,<br>
<br>
The speedo needle gets 'wound up' by the cable when moving, then a
spiral 'watch spring' should return the needle to zero as the cable
slows. I think you may have two problems, which may or may not be
related:<br>
<br>
1) The cable is driven by the angle drive, which is driven by a gear
on you O/D output shaft. It should not spin--at least, I don't <i>think
</i>it should--when you turn it at the speedo end, unless you've
pulled it out of the angle drive. Since it's not moving at speed,
the angle drive is probably TU.<br>
<br>
2) There's a couple things I can think of offhand that could cause
'non-return-to-zero;' the spring is busted, or something else is
jammed in the speedo (the cable drives a magnet, which torques a
metal plate to turn the needle; not much to break).<br>
<br>
The speedos can be disassembled--the hardest part is getting the
guts out with the odo zeroing knob in the way--and you could have a
look. Or, you could send it to one of the gauge shops (Nisonger,
West Valley, MoMa). I've attached the 'bible' on Smiths gauges in
case you don't have it.<br>
<br>
I don't think a tire change would make a 65-78MPH error, unless
you've changed to 13-inch wheels ;).<br>
<br>
Bob<br>
<br>
<div class="moz-cite-prefix">On 6/11/2021 3:04 PM, i erbs via
Healeys wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CABXhz880GCydqgmefDbidtw__rUzPemTNFTvOjFSbQmxvvTAYA@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">Any ideas on why my speedo is stuck at 78 MPH? my
cable spins freely when I remove it from the back of the speedo,
but does not spin while moving. I have not yet jacked it up to
see if my angle drive is shit or not. I need to replace it
anyway as my speedo is off with new tires. It said 78 , but I
was really doing 65., Honest officer<br clear="all">
<div>
<div dir="ltr" class="gmail_signature"
data-smartmail="gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div dir="ltr">Ira Erbs
<div>Milwaukie,OR</div>
<div><span
style="font-family:'Times
New Roman',serif">
_______
_______</span><br
style="font-family:'Times
New Roman',serif">
<span
style="font-family:'Times
New Roman',serif">
(______ \____1959 BN4____/
_______)</span><br
style="font-family:'Times
New Roman',serif">
<span
style="font-family:'Times
New Roman',serif">
(_________________________)</span></div>
<div> BT7 engine and
disk brakes</div>
<div><br>
</div>
<div><br>
</div>
<div>1967 MGB <img
src="http://www.britishcarspecialists.com/assets/images/MG_emblem.jpg"
alt="MG"
moz-do-not-send="true"></div>
<div><br>
</div>
<div><span
style="color:rgb(51,51,51);font-family:"Helvetica
Neue",Helvetica,Arial,sans-serif;font-size:14px">A racing car is an
animal with a thousand
adjustments. Mario Andretti</span><br>
</div>
<div>Please excuse random auto
corrects and misspelled words</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
</blockquote>
<br>
</body>
</html>