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<p>Hello Charles,</p>
<p>Many thanks indeed for the kind words.</p>
<p>No doubt there are many reasons for a speedo to fail, and if the
failure is total, it's probably the result of a snapped cable or a
stripped gear in the cable's right-angle gearbox (if present).
What motivated me to delve into the innards of the speedo on my
Rover 90 was failure of the mileage counter. In that case, the
bearing of the pinion gear got so stiff that the worm on the
speedo's input shaft chewed off a few of the gear teeth (which
were made of some sort of fibre).<br>
</p>
<p>Cheers,</p>
<p> -- Bill<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 20-Aug-2025 12:15 p.m., Charles
Kellogg via Rovernet wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAEuq98v_zQwV-yD5qxLa_Ue04d7-g6DuzoPg_XCVsP9yR2Wj9w@mail.gmail.com">
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<div dir="ltr">
<div>Bill,</div>
<div><br>
</div>
<div>Your explanation of the speedo's inner workings is
brilliant. Or maybe "just" you are !!! LOL That was VERY
enlightening indeed. THANK YOU !!! aFTER WORKING ON
lNAD-rOVERS FOR MORE THAN 55 YEARS THAT'S THE BEST EXPLANATION
i'VE EVER READ !! OOPS THE CAPS LOCK SWITCHED ON !! So do U
know what causes the innards of a speedo crash, requiring a
rebuild? </div>
<div><br>
</div>
<div>Warm regards,</div>
<div>
<div dir="ltr" class="gmail_signature"
data-smartmail="gmail_signature">
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<div dir="ltr"><br>
</div>
<div dir="ltr">Charles Kellogg</div>
<div dir="ltr">Director of Restorations<br>
<div>Dare Britannia, Ltd.</div>
<div>1043 Kaiser Rd. SW, Unit C</div>
<div>Olympia, WA 98512, USA</div>
</div>
</div>
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href="http://www.darebritannia.com/"
target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">http://www.darebritannia.com/</a></div>
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<p class="MsoNormal"><i><span
style="font-family:"Times New Roman",serif">Thank you for your
enquiry for our parts and
services. We offer the
highest-quality spare parts for
the vintage Land -Rover. Our
staff is minuscule while the
demand for rare and
\u201cunobtainable\u201d parts for early
Land-Rovers is relentless. While
your concern is important to us,
our ability to respond to each
and every enquiry may be limited
and stocks of many items are
critically low.. We are
primarily a restoration-based
enterprise but when we have a
surplus of a given item, we are
able to offer excess stocks to
our dedicated clients. If your
need is urgent, we encourage you
to contact us by phone, in
person. Leaving a message is
rarely effective, so we
recommend direct contact. With
many buildings full of parts, it
is not always easy to locate
obscure items, and the process
is often time consuming. We hope
you understand. Please provide </span><b
style="font-family:"Times New Roman",serif">complete </b><span
style="font-family:"Times New Roman",serif">details of your
exact model including year,
wheelbase, which side drive,
engine, Country of origin, etc.
When giving part numbers, please
also state the catalogue number
(typically found on the front
cover). We appreciate your
understanding and will do all we
can to help.</span></i><font
face="Times New Roman, serif"><i> </i><span></span></font></p>
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<div dir="ltr" class="gmail_attr">On Wed, Aug 20, 2025 at
9:00\u202fAM <<a href="mailto:rovernet-request@rovernet.org"
moz-do-not-send="true" class="moz-txt-link-freetext">rovernet-request@rovernet.org</a>>
wrote:<br>
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<br>
Today's Topics:<br>
<br>
1. Re: Rovernet Digest, Vol 143, Issue 3 (Charles Kellogg)<br>
2. Re: speedo is nervous (<a href="mailto:magnet@ican.net"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">magnet@ican.net</a>)<br>
3. Re: speedo is nervous (Jim Pile)<br>
4. Re: speedo is nervous (Gordon Reddy)<br>
5. Re: speedo is nervous (larry williamson)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Tue, 19 Aug 2025 09:04:26 -0700<br>
From: Charles Kellogg <<a
href="mailto:charlesk@darebritannia.com" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">charlesk@darebritannia.com</a>><br>
To: <a href="mailto:rovernet@rovernet.org" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">rovernet@rovernet.org</a><br>
Subject: Re: [Rovernet] Rovernet Digest, Vol 143, Issue 3<br>
Message-ID:<br>
<<a
href="mailto:CAEuq98uCN0wsxY7z0GZquyicRLRPEJKO6Z%2BUE1ksSfX0xnbySA@mail.gmail.com"
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Content-Type: text/plain; charset="utf-8"<br>
<br>
I suggest checking your cable, 1st at the gearbox 2 b sure
connection is<br>
tight, 2nd at speedo. If connections tight checking 4 cable
sheath<br>
burned thru or rusty IWC, replace cable. If no outer cable
flaws evident<br>
then pull inner cable and relubricate.<br>
<br>
<br>
Charles Kellogg<br>
Director of Restorations<br>
Dare Britannia, Ltd.<br>
1043 Kaiser Rd. SW, Unit C<br>
Olympia, WA 98512, USA<br>
<a href="http://www.darebritannia.com/" rel="noreferrer"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">http://www.darebritannia.com/</a><br>
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<br>
*Thank you for your enquiry for our parts and services. We
offer the<br>
highest-quality spare parts for the vintage Land -Rover. Our
staff is<br>
minuscule while the demand for rare and \u201cunobtainable\u201d parts
for early<br>
Land-Rovers is relentless. While your concern is important to
us, our<br>
ability to respond to each and every enquiry may be limited
and stocks of<br>
many items are critically low.. We are primarily a
restoration-based<br>
enterprise but when we have a surplus of a given item, we are
able to<br>
offer excess stocks to our dedicated clients. If your need is
urgent, we<br>
encourage you to contact us by phone, in person. Leaving a
message is<br>
rarely effective, so we recommend direct contact. With many
buildings full<br>
of parts, it is not always easy to locate obscure items, and
the process is<br>
often time consuming. We hope you understand. Please<br>
provide complete details of your exact model including year,
wheelbase,<br>
which side drive, engine, Country of origin, etc. When giving
part numbers,<br>
please also state the catalogue number (typically found on the
front<br>
cover). We appreciate your understanding and will do all we
can to help.*<br>
<br>
<br>
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On Tue, Aug 19, 2025, 9:00\u202fAM <<a
href="mailto:rovernet-request@rovernet.org" target="_blank"
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wrote:<br>
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> Today's Topics:<br>
><br>
> 1. speedo is nervous (larry williamson)<br>
> 2. Re: speedo is nervous (Steven Dibdin)<br>
><br>
><br>
>
----------------------------------------------------------------------<br>
><br>
> Message: 1<br>
> Date: Tue, 19 Aug 2025 06:31:47 -0600<br>
> From: larry williamson <<a
href="mailto:lewill4756@gmail.com" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">lewill4756@gmail.com</a>><br>
> To: Rovernet <<a href="mailto:rovernet@rovernet.org"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">rovernet@rovernet.org</a>><br>
> Subject: [Rovernet] speedo is nervous<br>
> Message-ID:<br>
> <<br>
> <a
href="mailto:CAPSjzi49d4HqBeHAS0zVe8NQ63yROH6kuS6tKZ9bWhtnWP2X7Q@mail.gmail.com"
target="_blank" moz-do-not-send="true"
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> Content-Type: text/plain; charset="utf-8"<br>
><br>
> My speedo is steady sometimes and sometimes jumps around.
What is the<br>
> reason and how to fix? I can't seem to find out in the
classic forum these<br>
> notes. Larry<br>
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> ><br>
><br>
> ------------------------------<br>
><br>
> Message: 2<br>
> Date: Tue, 19 Aug 2025 14:21:23 +0100<br>
> From: Steven Dibdin <<a
href="mailto:sdibdin@gmail.com" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">sdibdin@gmail.com</a>><br>
> To: Rovernet <<a href="mailto:rovernet@rovernet.org"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">rovernet@rovernet.org</a>><br>
> Cc: larry williamson <<a
href="mailto:lewill4756@gmail.com" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">lewill4756@gmail.com</a>>,
Rovernet<br>
> <<a href="mailto:rovernet@rovernet.org"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">rovernet@rovernet.org</a>><br>
> Subject: Re: [Rovernet] speedo is nervous<br>
> Message-ID: <<a
href="mailto:43FEA171-275D-49AF-AD01-F01EC598F612@gmail.com"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">43FEA171-275D-49AF-AD01-F01EC598F612@gmail.com</a>><br>
> Content-Type: text/plain; charset=utf-8<br>
><br>
> Which model Rover do you have Larry?<br>
><br>
> Steven<br>
><br>
> Sent from a small screen, please excuse any typos.<br>
><br>
> > On Aug 19, 2025, at 13:32, larry williamson via
Rovernet <<br>
> <a href="mailto:rovernet@rovernet.org" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">rovernet@rovernet.org</a>>
wrote:<br>
> ><br>
> > \ufeff<br>
> > My speedo is steady sometimes and sometimes jumps
around. What is the<br>
> reason and how to fix? I can't seem to find out in the
classic forum these<br>
> notes. Larry<br>
> > _______________________________________________<br>
> > Rovernet mailing list<br>
> > <a href="mailto:Rovernet@rovernet.org"
target="_blank" moz-do-not-send="true"
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> > <a
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><br>
> ------------------------------<br>
><br>
> Subject: Digest Footer<br>
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> ------------------------------<br>
><br>
> End of Rovernet Digest, Vol 143, Issue 3<br>
> ****************************************<br>
><br>
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------------------------------<br>
<br>
Message: 2<br>
Date: Tue, 19 Aug 2025 13:48:46 -0400<br>
From: "<a href="mailto:magnet@ican.net" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">magnet@ican.net</a>"
<<a href="mailto:magnet@ican.net" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">magnet@ican.net</a>><br>
To: larry williamson via Rovernet <<a
href="mailto:rovernet@rovernet.org" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">rovernet@rovernet.org</a>><br>
Subject: Re: [Rovernet] speedo is nervous<br>
Message-ID: <<a
href="mailto:e7a4c8b4-7266-420c-b65e-b6f0080ad961@ican.net"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">e7a4c8b4-7266-420c-b65e-b6f0080ad961@ican.net</a>><br>
Content-Type: text/plain; charset=UTF-8; format=flowed<br>
<br>
Hi Larry,<br>
<br>
Speedo issues almost always come down to lubrication, or to be
more <br>
precise the lack of it.<br>
<br>
As has been pointed out, the lube in the cable, and if
present, in the <br>
right-angle drive behind the speedo head, dries out and gets
gummy. <br>
Anything that resists the even turning of the cable,
especially up near <br>
the head, can cause jitter, as the cable "winds up" and then
"lets go" <br>
once it overcomes the resistance. On the "let go" phase, the
cable <br>
momentarily gives a little surge, resulting in a spike in the
speedo <br>
reading.<br>
<br>
But a more insidious problem inside the speedo head itself
often causes <br>
this surging, and lubricating the cable alone will not
eliminate it. <br>
Smiths (aka British Jaeger) speedometers use a little
pawl-and-ratchet <br>
arrangement to drive the mileage counter. A worm on the speedo
input <br>
shaft turns a pinion gear, and this gear moves a pawl back and
forth <br>
every time it goes around. The pawl, in turn, pushes a
toothed wheel <br>
around a few degrees on each stroke, and this wheel is coupled
to the <br>
tenths-of-a-mile dial of the mileage counter.<br>
<br>
Now what happens when the lubricant of the pawl and the
toothed wheel it <br>
drives dries out?<br>
<br>
The wheel gets harder for the pawl to turn. The pawl thus has
to work <br>
harder on the forward stroke as it turns the wheel. This
causes a <br>
heavier load on the speedo cable, which winds up a bit. But
the pawl's <br>
return stroke is easier, and the cable unwinds, giving a flip
to the <br>
speedo needle. Depending on your speed, this oscillation
takes place a <br>
couple of times each second or faster, resulting in a small
but <br>
noticeable jitter in the speedo needle. At some speed, this
jitter <br>
coincides with the resonant frequency of the needle and
hairspring <br>
assembly and you get a really big swing on the needle.<br>
<br>
But wait, it gets even more interesting! Every time the
tenths dial <br>
goes through a revolution, it moves the mile wheel forward by
1. So the <br>
pawl has to work even harder to turn two dials, wnding up the
cable even <br>
more, and causing a bigger flip when it relaxes. So once
every mile, <br>
you'll get a bigger swing of the needle. And every ten miles,
an even <br>
bigger swing, etc.<br>
<br>
Lubricating the pawl is easy, once you have opened up the
speedo head, <br>
and greasing the pinion wheel shaft is pretty straightforward
too. In <br>
my case, binding of this shaft was the main culprit. Just as
well, as <br>
lubrication of the six-wheel dial assembly would have involved
more <br>
disassembly than I was prepared to undertake.<br>
<br>
Cheers,<br>
<br>
-- Bill Daddis<br>
<br>
<br>
On 19-Aug-2025 8:31 a.m., larry williamson via Rovernet wrote:<br>
> My speedo is steady sometimes and sometimes jumps around.
What is the <br>
> reason and how to fix? I can't seem to find out in the
classic forum <br>
> these notes. Larry<br>
><br>
> _______________________________________________<br>
> Rovernet mailing list<br>
> <a href="mailto:Rovernet@rovernet.org" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">Rovernet@rovernet.org</a><br>
> <a
href="http://rovernet.org/mailman/listinfo/rovernet_rovernet.org"
rel="noreferrer" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">http://rovernet.org/mailman/listinfo/rovernet_rovernet.org</a><br>
<br>
------------------------------<br>
<br>
Message: 3<br>
Date: Tue, 19 Aug 2025 18:02:15 +0000 (UTC)<br>
From: Jim Pile <<a href="mailto:jpile1@verizon.net"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">jpile1@verizon.net</a>><br>
To: Rovernet <<a href="mailto:rovernet@rovernet.org"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">rovernet@rovernet.org</a>><br>
Subject: Re: [Rovernet] speedo is nervous<br>
Message-ID: <<a
href="mailto:293331860.863655.1755626535318@mail.yahoo.com"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">293331860.863655.1755626535318@mail.yahoo.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Amazingly detailed info, Bill. Thanks for explaining a
ubiquitous issue with the earlier P6 models. <br>
<br>
<br>
Sent from the all new AOL app for iOS<br>
<br>
<br>
On Tuesday, August 19, 2025, 1:49 PM, magnet--- via Rovernet
<<a href="mailto:rovernet@rovernet.org" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">rovernet@rovernet.org</a>>
wrote:<br>
<br>
Hi Larry,<br>
<br>
Speedo issues almost always come down to lubrication, or to be
more <br>
precise the lack of it.<br>
<br>
As has been pointed out, the lube in the cable, and if
present, in the <br>
right-angle drive behind the speedo head, dries out and gets
gummy. <br>
Anything that resists the even turning of the cable,
especially up near <br>
the head, can cause jitter, as the cable "winds up" and then
"lets go" <br>
once it overcomes the resistance. On the "let go" phase, the
cable <br>
momentarily gives a little surge, resulting in a spike in the
speedo <br>
reading.<br>
<br>
But a more insidious problem inside the speedo head itself
often causes <br>
this surging, and lubricating the cable alone will not
eliminate it. <br>
Smiths (aka British Jaeger) speedometers use a little
pawl-and-ratchet <br>
arrangement to drive the mileage counter. A worm on the speedo
input <br>
shaft turns a pinion gear, and this gear moves a pawl back and
forth <br>
every time it goes around. The pawl, in turn, pushes a
toothed wheel <br>
around a few degrees on each stroke, and this wheel is coupled
to the <br>
tenths-of-a-mile dial of the mileage counter.<br>
<br>
Now what happens when the lubricant of the pawl and the
toothed wheel it <br>
drives dries out?<br>
<br>
The wheel gets harder for the pawl to turn. The pawl thus has
to work <br>
harder on the forward stroke as it turns the wheel. This
causes a <br>
heavier load on the speedo cable, which winds up a bit. But
the pawl's <br>
return stroke is easier, and the cable unwinds, giving a flip
to the <br>
speedo needle. Depending on your speed, this oscillation
takes place a <br>
couple of times each second or faster, resulting in a small
but <br>
noticeable jitter in the speedo needle. At some speed, this
jitter <br>
coincides with the resonant frequency of the needle and
hairspring <br>
assembly and you get a really big swing on the needle.<br>
<br>
But wait, it gets even more interesting! Every time the
tenths dial <br>
goes through a revolution, it moves the mile wheel forward by
1. So the <br>
pawl has to work even harder to turn two dials, wnding up the
cable even <br>
more, and causing a bigger flip when it relaxes. So once
every mile, <br>
you'll get a bigger swing of the needle. And every ten miles,
an even <br>
bigger swing, etc.<br>
<br>
Lubricating the pawl is easy, once you have opened up the
speedo head, <br>
and greasing the pinion wheel shaft is pretty straightforward
too. In <br>
my case, binding of this shaft was the main culprit. Just as
well, as <br>
lubrication of the six-wheel dial assembly would have involved
more <br>
disassembly than I was prepared to undertake.<br>
<br>
Cheers,<br>
<br>
-- Bill Daddis<br>
<br>
<br>
On 19-Aug-2025 8:31 a.m., larry williamson via Rovernet wrote:<br>
> My speedo is steady sometimes and sometimes jumps around.
What is the <br>
> reason and how to fix? I can't seem to find out in the
classic forum <br>
> these notes. Larry<br>
><br>
> _______________________________________________<br>
> Rovernet mailing list<br>
> <a href="mailto:Rovernet@rovernet.org" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">Rovernet@rovernet.org</a><br>
> <a
href="http://rovernet.org/mailman/listinfo/rovernet_rovernet.org"
rel="noreferrer" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">http://rovernet.org/mailman/listinfo/rovernet_rovernet.org</a><br>
<br>
_______________________________________________<br>
Rovernet mailing list<br>
<a href="mailto:Rovernet@rovernet.org" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">Rovernet@rovernet.org</a><br>
<a
href="http://rovernet.org/mailman/listinfo/rovernet_rovernet.org"
rel="noreferrer" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">http://rovernet.org/mailman/listinfo/rovernet_rovernet.org</a><br>
<br>
<br>
<br>
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<br>
------------------------------<br>
<br>
Message: 4<br>
Date: Tue, 19 Aug 2025 20:11:24 -0700<br>
From: Gordon Reddy <<a href="mailto:gorgowof@gmail.com"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">gorgowof@gmail.com</a>><br>
To: Rovernet <<a href="mailto:rovernet@rovernet.org"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">rovernet@rovernet.org</a>><br>
Subject: Re: [Rovernet] speedo is nervous<br>
Message-ID:<br>
<CAGxhdkEjvR_Gaix=mNoYh0kNte+ZtZXbU8V=<a
href="mailto:JPjjdECeL4wgow@mail.gmail.com" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">JPjjdECeL4wgow@mail.gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Amazing! I will try this on my P5 this winter, thank you Bill!<br>
Gord Reddy<br>
<br>
On Tue, 19 Aug 2025 at 11:03, Jim Pile via Rovernet <<a
href="mailto:rovernet@rovernet.org" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">rovernet@rovernet.org</a>><br>
wrote:<br>
<br>
> Amazingly detailed info, Bill. Thanks for explaining a
ubiquitous issue<br>
> with the earlier P6 models.<br>
><br>
><br>
> Sent from the all new AOL app for iOS<br>
> <<a
href="https://aolapp.onelink.me/eG2g?pid=NativePlacement&c=US_Acquisition_YMktg_320_EmailSignature_AttributionDL&af_sub1=Acquisition&af_sub2=US_YMktg&af_sub3=&af_sub4=100002473&af_sub5=SentFromNewAOLApp__Interstitial_&af_ios_store_cpp=ce85ce34-ad0f-4811-a92b-a172743b064e&af_android_url=https%3A%2F%2Fplay.google.com%2Fstore%2Fapps%2Fdetails%3Fid%3Dcom.aol.mobile.aolapp%26listing%3Demail_signature_attribution"
rel="noreferrer" target="_blank" moz-do-not-send="true">https://aolapp.onelink.me/eG2g?pid=NativePlacement&c=US_Acquisition_YMktg_320_EmailSignature_AttributionDL&af_sub1=Acquisition&af_sub2=US_YMktg&af_sub3=&af_sub4=100002473&af_sub5=SentFromNewAOLApp__Interstitial_&af_ios_store_cpp=ce85ce34-ad0f-4811-a92b-a172743b064e&af_android_url=https%3A%2F%2Fplay.google.com%2Fstore%2Fapps%2Fdetails%3Fid%3Dcom.aol.mobile.aolapp%26listing%3Demail_signature_attribution</a>><br>
><br>
> On Tuesday, August 19, 2025, 1:49 PM, magnet--- via
Rovernet <<br>
> <a href="mailto:rovernet@rovernet.org" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">rovernet@rovernet.org</a>>
wrote:<br>
><br>
> Hi Larry,<br>
><br>
> Speedo issues almost always come down to lubrication, or
to be more<br>
> precise the lack of it.<br>
><br>
> As has been pointed out, the lube in the cable, and if
present, in the<br>
> right-angle drive behind the speedo head, dries out and
gets gummy.<br>
> Anything that resists the even turning of the cable,
especially up near<br>
> the head, can cause jitter, as the cable "winds up" and
then "lets go"<br>
> once it overcomes the resistance. On the "let go" phase,
the cable<br>
> momentarily gives a little surge, resulting in a spike in
the speedo<br>
> reading.<br>
><br>
> But a more insidious problem inside the speedo head
itself often causes<br>
> this surging, and lubricating the cable alone will not
eliminate it.<br>
> Smiths (aka British Jaeger) speedometers use a little
pawl-and-ratchet<br>
> arrangement to drive the mileage counter. A worm on the
speedo input<br>
> shaft turns a pinion gear, and this gear moves a pawl
back and forth<br>
> every time it goes around. The pawl, in turn, pushes a
toothed wheel<br>
> around a few degrees on each stroke, and this wheel is
coupled to the<br>
> tenths-of-a-mile dial of the mileage counter.<br>
><br>
> Now what happens when the lubricant of the pawl and the
toothed wheel it<br>
> drives dries out?<br>
><br>
> The wheel gets harder for the pawl to turn. The pawl
thus has to work<br>
> harder on the forward stroke as it turns the wheel. This
causes a<br>
> heavier load on the speedo cable, which winds up a bit.
But the pawl's<br>
> return stroke is easier, and the cable unwinds, giving a
flip to the<br>
> speedo needle. Depending on your speed, this oscillation
takes place a<br>
> couple of times each second or faster, resulting in a
small but<br>
> noticeable jitter in the speedo needle. At some speed,
this jitter<br>
> coincides with the resonant frequency of the needle and
hairspring<br>
> assembly and you get a really big swing on the needle.<br>
><br>
> But wait, it gets even more interesting! Every time the
tenths dial<br>
> goes through a revolution, it moves the mile wheel
forward by 1. So the<br>
> pawl has to work even harder to turn two dials, wnding up
the cable even<br>
> more, and causing a bigger flip when it relaxes. So once
every mile,<br>
> you'll get a bigger swing of the needle. And every ten
miles, an even<br>
> bigger swing, etc.<br>
><br>
> Lubricating the pawl is easy, once you have opened up the
speedo head,<br>
> and greasing the pinion wheel shaft is pretty
straightforward too. In<br>
> my case, binding of this shaft was the main culprit.
Just as well, as<br>
> lubrication of the six-wheel dial assembly would have
involved more<br>
> disassembly than I was prepared to undertake.<br>
><br>
> Cheers,<br>
><br>
> -- Bill Daddis<br>
><br>
><br>
> On 19-Aug-2025 8:31 a.m., larry williamson via Rovernet
wrote:<br>
> > My speedo is steady sometimes and sometimes jumps
around. What is the<br>
> > reason and how to fix? I can't seem to find out in
the classic forum<br>
> > these notes. Larry<br>
> ><br>
> > _______________________________________________<br>
> > Rovernet mailing list<br>
> > <a href="mailto:Rovernet@rovernet.org"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">Rovernet@rovernet.org</a><br>
> > <a
href="http://rovernet.org/mailman/listinfo/rovernet_rovernet.org"
rel="noreferrer" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">http://rovernet.org/mailman/listinfo/rovernet_rovernet.org</a><br>
><br>
> _______________________________________________<br>
> Rovernet mailing list<br>
> <a href="mailto:Rovernet@rovernet.org" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">Rovernet@rovernet.org</a><br>
> <a
href="http://rovernet.org/mailman/listinfo/rovernet_rovernet.org"
rel="noreferrer" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">http://rovernet.org/mailman/listinfo/rovernet_rovernet.org</a><br>
><br>
> _______________________________________________<br>
> Rovernet mailing list<br>
> <a href="mailto:Rovernet@rovernet.org" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">Rovernet@rovernet.org</a><br>
> <a
href="http://rovernet.org/mailman/listinfo/rovernet_rovernet.org"
rel="noreferrer" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">http://rovernet.org/mailman/listinfo/rovernet_rovernet.org</a><br>
><br>
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<br>
------------------------------<br>
<br>
Message: 5<br>
Date: Wed, 20 Aug 2025 05:22:46 -0600<br>
From: larry williamson <<a
href="mailto:lewill4756@gmail.com" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">lewill4756@gmail.com</a>><br>
To: Rovernet <<a href="mailto:rovernet@rovernet.org"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">rovernet@rovernet.org</a>><br>
Subject: Re: [Rovernet] speedo is nervous<br>
Message-ID:<br>
<CAPSjzi5Q6=eXv8gUNP3L5oSd4OxJsL378x7KES0eGxbKzVa=<a
href="mailto:Jw@mail.gmail.com" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">Jw@mail.gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Thank for all that responded. Now the work begins. Larry<br>
<br>
On Tue, Aug 19, 2025 at 9:12\u202fPM Gordon Reddy via Rovernet <<br>
<a href="mailto:rovernet@rovernet.org" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">rovernet@rovernet.org</a>>
wrote:<br>
<br>
> Amazing! I will try this on my P5 this winter, thank you
Bill!<br>
> Gord Reddy<br>
><br>
> On Tue, 19 Aug 2025 at 11:03, Jim Pile via Rovernet <<a
href="mailto:rovernet@rovernet.org" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">rovernet@rovernet.org</a>><br>
> wrote:<br>
><br>
>> Amazingly detailed info, Bill. Thanks for explaining
a ubiquitous issue<br>
>> with the earlier P6 models.<br>
>><br>
>><br>
>> Sent from the all new AOL app for iOS<br>
>> <<a
href="https://aolapp.onelink.me/eG2g?pid=NativePlacement&c=US_Acquisition_YMktg_320_EmailSignature_AttributionDL&af_sub1=Acquisition&af_sub2=US_YMktg&af_sub3=&af_sub4=100002473&af_sub5=SentFromNewAOLApp__Interstitial_&af_ios_store_cpp=ce85ce34-ad0f-4811-a92b-a172743b064e&af_android_url=https%3A%2F%2Fplay.google.com%2Fstore%2Fapps%2Fdetails%3Fid%3Dcom.aol.mobile.aolapp%26listing%3Demail_signature_attribution"
rel="noreferrer" target="_blank" moz-do-not-send="true">https://aolapp.onelink.me/eG2g?pid=NativePlacement&c=US_Acquisition_YMktg_320_EmailSignature_AttributionDL&af_sub1=Acquisition&af_sub2=US_YMktg&af_sub3=&af_sub4=100002473&af_sub5=SentFromNewAOLApp__Interstitial_&af_ios_store_cpp=ce85ce34-ad0f-4811-a92b-a172743b064e&af_android_url=https%3A%2F%2Fplay.google.com%2Fstore%2Fapps%2Fdetails%3Fid%3Dcom.aol.mobile.aolapp%26listing%3Demail_signature_attribution</a>><br>
>><br>
>> On Tuesday, August 19, 2025, 1:49 PM, magnet--- via
Rovernet <<br>
>> <a href="mailto:rovernet@rovernet.org"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">rovernet@rovernet.org</a>>
wrote:<br>
>><br>
>> Hi Larry,<br>
>><br>
>> Speedo issues almost always come down to lubrication,
or to be more<br>
>> precise the lack of it.<br>
>><br>
>> As has been pointed out, the lube in the cable, and
if present, in the<br>
>> right-angle drive behind the speedo head, dries out
and gets gummy.<br>
>> Anything that resists the even turning of the cable,
especially up near<br>
>> the head, can cause jitter, as the cable "winds up"
and then "lets go"<br>
>> once it overcomes the resistance. On the "let go"
phase, the cable<br>
>> momentarily gives a little surge, resulting in a
spike in the speedo<br>
>> reading.<br>
>><br>
>> But a more insidious problem inside the speedo head
itself often causes<br>
>> this surging, and lubricating the cable alone will
not eliminate it.<br>
>> Smiths (aka British Jaeger) speedometers use a little
pawl-and-ratchet<br>
>> arrangement to drive the mileage counter. A worm on
the speedo input<br>
>> shaft turns a pinion gear, and this gear moves a pawl
back and forth<br>
>> every time it goes around. The pawl, in turn, pushes
a toothed wheel<br>
>> around a few degrees on each stroke, and this wheel
is coupled to the<br>
>> tenths-of-a-mile dial of the mileage counter.<br>
>><br>
>> Now what happens when the lubricant of the pawl and
the toothed wheel it<br>
>> drives dries out?<br>
>><br>
>> The wheel gets harder for the pawl to turn. The pawl
thus has to work<br>
>> harder on the forward stroke as it turns the wheel.
This causes a<br>
>> heavier load on the speedo cable, which winds up a
bit. But the pawl's<br>
>> return stroke is easier, and the cable unwinds,
giving a flip to the<br>
>> speedo needle. Depending on your speed, this
oscillation takes place a<br>
>> couple of times each second or faster, resulting in a
small but<br>
>> noticeable jitter in the speedo needle. At some
speed, this jitter<br>
>> coincides with the resonant frequency of the needle
and hairspring<br>
>> assembly and you get a really big swing on the
needle.<br>
>><br>
>> But wait, it gets even more interesting! Every time
the tenths dial<br>
>> goes through a revolution, it moves the mile wheel
forward by 1. So the<br>
>> pawl has to work even harder to turn two dials,
wnding up the cable even<br>
>> more, and causing a bigger flip when it relaxes. So
once every mile,<br>
>> you'll get a bigger swing of the needle. And every
ten miles, an even<br>
>> bigger swing, etc.<br>
>><br>
>> Lubricating the pawl is easy, once you have opened up
the speedo head,<br>
>> and greasing the pinion wheel shaft is pretty
straightforward too. In<br>
>> my case, binding of this shaft was the main culprit.
Just as well, as<br>
>> lubrication of the six-wheel dial assembly would have
involved more<br>
>> disassembly than I was prepared to undertake.<br>
>><br>
>> Cheers,<br>
>><br>
>> -- Bill Daddis<br>
>><br>
>><br>
>> On 19-Aug-2025 8:31 a.m., larry williamson via
Rovernet wrote:<br>
>> > My speedo is steady sometimes and sometimes
jumps around. What is the<br>
>> > reason and how to fix? I can't seem to find out
in the classic forum<br>
>> > these notes. Larry<br>
>> ><br>
>> > _______________________________________________<br>
>> > Rovernet mailing list<br>
>> > <a href="mailto:Rovernet@rovernet.org"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">Rovernet@rovernet.org</a><br>
>> > <a
href="http://rovernet.org/mailman/listinfo/rovernet_rovernet.org"
rel="noreferrer" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">http://rovernet.org/mailman/listinfo/rovernet_rovernet.org</a><br>
>><br>
>> _______________________________________________<br>
>> Rovernet mailing list<br>
>> <a href="mailto:Rovernet@rovernet.org"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">Rovernet@rovernet.org</a><br>
>> <a
href="http://rovernet.org/mailman/listinfo/rovernet_rovernet.org"
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End of Rovernet Digest, Vol 143, Issue 4<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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