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Old 02-03-2020, 06:02 PM   #1
kooljunkguy
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Default Loud Speedometer!

The other day I was driving my Phaeton and all the sudden the speedometer began making a horribly loud noise. The dial would fluctuate and it would get extremely loud once I got to about 10-15mph. The cable never snapped its would just get loud, I could reach under the gas tank and push the metal cable housing up toward the speedometer while it was making the noise and it would stop until I let go.
Any idea what I might check first before I begin chasing around for the problem?
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Old 02-03-2020, 06:19 PM   #2
Synchro909
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Default Re: Loud Speedometer!

When these instruments were assembled, a little lubrication was put in the appropriate places. Over the intervening 90 years, it has dried out and lost its lubrication properties causing noisy "chatter". The fix is to have it serviced by an instrument maker/repairer if you are not confident about doing it yourself. They will relubricate it and you'll be good for the next 90 years.
If you think you are up to it, open it up and apply a little light oil to everywhere parts move. A light oil will also "reactivate" the old lube some.
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Old 02-03-2020, 06:44 PM   #3
Marshall V. Daut
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Default Re: Loud Speedometer!

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Old 02-03-2020, 07:45 PM   #4
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Default Re: Loud Speedometer!

There is speedometer lube (graphite) available from most of the "A" vendors, small tube and works great. I would take the cable completely off to clean it first. Hang it vertically so it is straight up and down and very slowly add a solvent to remove gunk and dried lubricant. Catch it in a can and continue until it runs clear, then let it drip dry for a day or two. Add lube and hopefully you are home free. Good luck! Gary D.
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Old 02-03-2020, 07:54 PM   #5
Mark in MT
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Default Re: Loud Speedometer!

Test the speedometer and the cable for smooth movement. If either one is dry, it can howl like a banshee! I find that the speedometers most often are the problem, the lube has dried out and turned to rock, the oil wicks are dry. If it runs too long like this, it will wear out the frame, lots of work to fix it then.


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Old 02-03-2020, 08:50 PM   #6
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Default Re: Loud Speedometer!

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Thanks all, I’ll try both lubing the cable and the speedo as suggested and see if that solves it.
My speedo was redone by one of my Model A Club members about 60 years ago! Could probably use a bit of oil
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Old 02-03-2020, 10:42 PM   #7
SteveB31
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Default Re: Loud Speedometer!

Besides not being lubed in 90 years, the other cause of that noise is, the inner housing of the speedometer is a machined casting made of pot metal. Pot metal expands as it ages, and the expanding housing makes the machined holes inside that house the little shaft sand gears get smaller causing the spinning shafts to bind up and make noise.
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Old 02-04-2020, 08:56 AM   #8
rocket1
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Default Re: Loud Speedometer!

Lube the cable,remove the steel plug off the rear of the speedo (the cast housing is peaned over it) clean out the old dried grease and pack with graphite grease,worked for me,had the same symptoms.
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Old 02-04-2020, 09:30 AM   #9
rotorwrench
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Default Re: Loud Speedometer!

Most speed and rpm instruments of the analog variety have a magnet shaft that spins inside a drag cup attached to a clock type spring. If the magnet & drag cup get too much slack in the bearings, they can make contact with each other and cause both a shrieking sound and a peg out of the indicator. Lubrication may help but there may also be a need for an overhaul of the instrument.
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Old 02-06-2020, 05:00 AM   #10
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Default Re: Loud Speedometer!

I lubed the speedometer with graphite oil and the cable with white lithium grease today and took it for a drive, so far so good! Thanks all who replied.
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